- Camshaft duration rpm range These include: Engine Size and Displacement: Larger engines often benefit from longer durations due to their increased airflow requirements. Most engine builders feel that 0. Product Q&A View Now. /220 exh. 0122, 7am-10pm CST, everyday. And as the duration increases the torque will move up the RPM range. 3 Choppy idle that lets everyone know your LS means business Recommend 2,500 rpm stall torque converter for best performance Increases mid-range and top end Understanding Camshaft Specifications: Lift and Duration. " . Just as well, running with more duration and longer periods of overlap can be a little slow in RPM buildup at lower RPMS. High-performance hydraulic roller camshaft for Chevrolet small block engines, designed to enhance power and efficiency. The cam will make power in a certain rpm range but if the bottom end is not up to operating at 6500+ rpm you are looking for trouble. With that said, the camshaft must be designed correctly in order for an engine to operate at higher RPM, in conjunction with intake manifold, head porting, exhaust system, etc. 440″-0. COMP Cams Big Mutha" Thumpr Hydraulic Flat Tappet Camshaft Lift . Part Number: 249-31-226-3. /502 H. The correct camshaft selection will match valve operation to pressure Ive always picked the duration and lift based upon the intended rpm range and the lsa/icl based upon the commonly thrown around rules of thumb. Heres a couple rough rules of thumb for cam selection. The COMP Cams K11-242-3 camshaft kit fits the Gen V big-block Chevelle engine and improved both power and rpm performance. If the car is heavy you may want to think about going the other way, decrease the duration a tad bit and still go wider on the lobe Center. Free Shipping - QTY . RPM Range: 2500-6400. The question is why does the camshaft act bigger. Currently running the GM 454HO roller cam(I210/E230). The 292xfi. An interactive camshaft calculator where engine builders can see how valve overlap (and boost efficiency) is affected by a camshaft’s physical design. The rpm range is determined by the camshaft manufacturer. Expanding upon that example, let’s say there are two engines, with Duration also affects the RPM range, of the cam, and will allow you to tune the engine to a specific RPM to produce power. Good low and mid range torque. I just can't remember what it is. 447 exhaust, Lobe C/L 114. COMP Cams | #282416007. 050 lift - . For a pleasure type application you want to be around 1000 rpm lower then WOT. Top. /232 exh. This process adds about a 5% increase in the area under the lift curve. But most other > companies only show about 6500rpm. A long duration camshaft usually has a power band way up the RPM range (6,000+), and a race motor that sees frequent sustained high RPMs can really make a lot of power with that high VE. 550 COMP Cams‘ camshaft specialist Jay Adams says, “Most of the time it is easier to move the torque throughout the rpm range with a custom cam in race applications because the intended operating RPM range is significantly 2,000-5,800 RPM Operating Range; 227/241 Duration at . 9 / 8 = 98. Matching your camshaft to the rpm usage, performance needs, and driving style will ensure your camshaft I do have all those data you are referring to. The less duration the camshaft has, the more torque an engine will make; the higher the duration, the engine will make more top-end horsepower, but not as much torque. This RPM or power band will denote the efficiency range that the camshaft was designed for and is typically displayed as "1500-6500RPM" for example. B303. com with desired rpm range, current Custom 1FZFE Camshafts Made To Order. I'll be using a torque converter and am trying to keep RPMs below 6k. Roller Camshaft, Chevy LS. The . Dyno proven increases in horsepower and torque for your late model GM truck with Vortec LS V8; Provides that unique idle "chop" Few drivers can accurately tell you what their lowest rpm really is. 050 222 intake/222 exhaust, Valve Lift . 050" duration is meaningless to me, and is just a byproduct of the shape of the lobe used with that seat duration. A. For every 10 COMP Cams 12-210-2: High Energy 268H Hydraulic Flat Tappet Camshaft Lift: . Get the Best Performance with COMP Cams Xtreme Energy XE274H Hydraulic Flat Tappet Camshaft Only Lift: . 050" Duration numbers the opening/close will be at . 050 inches and the duration advertised. In the crudest of simplifications, the duration determines the operating RPM range of a camshaft. 4/2/2025 07:43:14 AM PONTIAC POWER RULES ! ! ! Camshaft Calculator: Camshaft Lobe Center / Duration Calculator Increasing the degrees of overlap tends to move the powerband up the RPM band. higher of both moves it higher in the rev range. the reason is because of scavenging during the overlap. to achieve best performance, match carburetion, intake manifold, ignition and headers to the camshaft. Free Shipping - Ships QTY . Kelford Cams L182-C Camshafts. Click image to zoom. Grind Number: 282 H06 Operating Range: Camshaft Basics. 050" Lift): 226. 050” of lift. 479″/0. On this optimized for “460 cid at 7250” combination, the increase of intake duration may increase the operating rpm range for the larger pump but at the expense of power up to the point where It shows the typical RPM range as a function of the intake valve duration at 0. A camshaft with a long duration doesn't run well Duration at 0. One of the reasons they don’t make as much torque is because when you’re increasing the duration timing, it increases A centerline of 108 will give power in the upper RPM range. 615 ex. When someone talks about a “big” cam, they are referring to cams with longer duration. 10. 053” duration is closely related to the RPM range where the engine makes its best power. Speedway Motors | #91555010. 480'' Duration: Revisiting lift: As with duration, stepping it up will generally increase output, and, to a lesser extent rpm capabilities, provided the cylinder heads, intake, and exhaust system are up to the task. 050″. 050-inch lift) are useful for guidance but not definitive when comparing cam profiles. 95 Lowest Price Guarantee Duration 306/306 RPM Range 4500-7500 See more product details. The cam I installed was a Comp #21-223-4 Xtreme Energy 268H Hydraulic Flat Tappet Camshaft Only Lift:. 3. Say from a 350CI motor to a 383CI motor. Basic Operating As a part of your engine, camshafts operate within a certain RPM range. Big track cam! Warning: may cause traction problems. 050" of cam lift is the best for comparison of specs *Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16'' wide x 7/64'' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine. Does the intake duration, exhaust duration or the differrence between the two effect the RPM range. e. Basic Operating RPM Range 2,500-5,500 Intake Duration at 050 inch Lift 220 Exhaust Duration at 050 inch Lift 220 Duration at 050 inch Lift 220 int. 006" is later than one would expect for a 291 adv cam (i measured adv int. Impress your friends with the "rump rump rump" sound that the hairy-chested camshaft causes. In contrast, the Crower 272/272 cam gives a basic operating range of 1000 RPM to 8000 RPM. /282 exh. lift. Get the Best Performance with COMP Cams High Energy 260H Hydraulic Flat Tappet Camshaft Lift: . Here is a page for RPM range for durations. 050” lift is a standard industry specification, and tells us the duration that the camshaft will spend at 0. It is true that the camshaft is responsible for opening and closing valves. Adding duration or advancing the cam lobe. 488"/. Items You Need. 050" Lift): 252. This is the time in degrees that the intake and exhaust valves are open. 454" Duration: 268°/268° RPM Range: 1500-5500 C. See "What These curves are an exaggeration of the problem we frequently encounter with "performance" camshafts. We had a large runner (252cc) brodix 10x head make Proper camshaft selection is a combination of first and foremost, your experience coupled with the determined usage; engine displacement, compression ratio, fuel system carbureted or injected, RPM range power Identify your performance goals, such as increased horsepower, torque, or a specific RPM range. COMP Cams | #282356024. Talk to the experts. History: When I first built my (forged 5. When increasing the cubic inch of a motor there is a formula for increasing the size/duration of the camshaft. so you look at the top set of rpm range bars to find the average power band you prefer to operate in, then look on the left side to get a cam intake at . Adding duration extends both the RPM range and opens the valve earlier. COMP Cams 12-235-2 Xtreme 4×4 210/218 Hydraulic Flat Cam – Best Value Camshaft For Small Block Chevy. A camshaft with a longer duration is typically optimized for higher engine speeds, as it allows the valves to open and close more quickly to accommodate increased air and fuel flow. 5:1 compression, a 305-degree-duration cam, a two-barrel carb, stock exhaust manifolds, a Several factors influence the optimal camshaft duration for a given engine. . 050in on both intake Rpm Operating Range: 2,000-5,800 RPM: 2,500-6400 RPM: 2,000-6000 RPM: Lobe Separation Angle: 107: 107: 110 : Advertised Duration (INT/EXH) 279/297: 295/313: 230/230: Duration at . For that reason, fly cut or valve relief pistons are a requirement. 111 Degree Lobe Separation Angle, This range of camshaft is more for engine design rather than for camshaft replacement The engine most be designed and built with the design of the camshaft in perspective. Save Share arms in order to make the bean counters happy by saving the tooling cost it would take to make higher lift and longer duration camshafts. 050 duration is closely related to the rpm range where the engine Most camshaft manufacturers will list the optimum rpm range on each camshaft. 006" If you use . made by Speedway Motors, for as low as $261. In 396-402 use 2500-stall converter, lower gears. 040‚Â (1mm), or . In previous articles, we’ve talked about the importance of Considering Individual Timing Events When Choosing a Cam to Decreasing the seat-to seat duration does the exact opposite. The Summit Racing™ 303 Plus camshafts are available in multiple RPM operating ranges, durations, and other performance options. /228 exh. Choosing a performance cam becomes a big compromise; when it comes to power, you have to give some to The longer the duration, the more of the "big cam" problems you create; poor idle, low idle vacuum, poor engine efficiency at low RPMs, soft bottom end, bad cruise gas mileage, etc. 050" range you want to select where you want max torque. 7. Intake Valve Lift with Factory Rocker Arm Ratio 0. com with desired rpm range, current modifications and Basic Operating RPM Range: 2,000-5,000 Intake Duration at 050 inch Lift: 216 Exhaust Duration at 050 inch Lift: 228 Duration at 050 inch Lift: 216 int. A camshaft with more valve overlap (106 LSA) will have less cylinder filling at low RPM. Typically longer duration camshafts and longer periods of overlap allow the ability to run a higher static compression ratio without detonation in the low RPM range. the other. These higher lift, longer duration camshafts demand Duration: The duration of the cam provides us information about how long the valve will be open. Save Share Here is the VE table difference between what came from the factory in 1995 and what is needed with a small 196 duration hydraulic roller and vortec head swap. Advancing the camshaft (shifting it to ahead of the crankshaft Your big block sounds like a very mild build so a range 2 duration is what i would recommend in whatever brand of cam you like as long as you stay in the range of duration suitable to your build you'll be fine. 90 798. RPM Range: 2200-6100. Summit Racing SUM-K1301 - Summit Racing® Cam and Lifter Kits - Overview Overlap and duration are the two big factors in cam design. Exhaust duration @ . The camshaft offers adequate valve lift of at most 0. RPM Range: 2750-6250. 050" with with what is needed CFM wise to feed the engine at this rpm. This angle dictates two important events: the valve overlap C1 & C2 Corvettes - 327 idle with L79 camshaft - I have just completed my build and used the 151 cam /aka L79 grind , here are the specs!intake and exh lift . steel-roller camshaft (PN 24502611) with 211/230 degrees of duration at 0. Crane Cams Energizer is a high-quality performance camshaft that delivers noticeable power gains and improved torque. 050 lift duration range and have most of it build after tdc in crank This calculator will help you rapidly determine the perfect camshaft for your application. 440" /. 110 Degree Lobe Separation Angle . Share this On shorter duration camshafts like this particular cam, an interesting event occurs that is worth describing. 640"/. 050" Lift): 235. For this story, we will be using a 0. Best Cam Product guides. Re: Camshaft RPM range? Post by Geoff2 » Sun Nov 10, 2019 8:35 am. 050” RPM Operating Range: This camshaft comes with a very high RPM operating range which allows it to give out the most horsepower within a large RPM operating Camshaft intensity is a measurement term coined by Harvey Crane to compare ramp characteristics of camshafts. With it being non-symmetric, intake closing @ 0. $272. com , hotrodg726 , KRUNK !!!! and 1 other person Camshaft Type: Solid Flat Tappet. An exhaust centerline of 112 is the most advanced while the 102 is the most retarded. 050” lift” is the deciding factor to what the engine’s basic rpm range will be. Shorter duration camshafts, on the other hand, tend to favor torque at lower RPMs. 512" Duration: 280°/280° RPM Range: 2000-6000. A cam with a duration of 240 degrees of higher will typically produce the most power from 3,500 to 7,000 rpm. I will admit I didn't degree the camshaft like i should have but I used the stock General Q & A - Cam duration vs RPMs - Was thinking about swapping out my cam this winter. I would buy the spring kit and use this camshaft. 656 lift with 1. **DURATION MEASURED FROM . 450 Lift Hydraulic Cam, 3000-6000 RPM. 495" Duration: 264°/270° RPM Range: 1000-5000. 540 1. Engine RPM Range: High-RPM engines typically utilize longer durations to maximize power at higher speeds. 050 We used a variation of the L-79 151 camshaft on a tight 107 or 108 Duration RPM range is as dependant on the cylinder heads and intake runner size as it is on the cam. 050 lift. Rough idle. More duration does push the the power range up higher in the rpm range. Operating Range: 1800-5800 RPM Duration Advertised: 270° Intake / 270° Exhaust Duration @ . RPM Range: Idle-5000: Intake Duration (. 440" Duration: 260°/260° RPM Range: 1200-5200 C. 050" may seem confusing but the important thing that must be remembered is: as the duration at 0. 050". 585”/. A camshaft’s operating range it essentially its Adding duration will increase the rpm range the camshaft makes power. duration at 294 and 295 on some cylinders) Scott. 95 lift, 282 Duration. 3 with Stage II PRC heads, 1 7/8" headers, MP112) engine back in 2015 I installed a used GT-9 camshaft (215/247 duration @ . 107 Degree Lobe Separation Angle; 0. In racing you would retard a cam for high RPMs, they also could breath and had no restriction in the exhaust. • Hydraulic Intensity is the difference between the . Both cams have a duration of 250 at Understanding the 4 Key Individual Timing Events for Camshaft Selection. The listed range is a result of testing the camshaft on a dyno with different combinations of engine parts. See more product details. 7 rocker 121 CL ). 5) and ran it with over 11:1 in a 350" Loose build with . Shop Now at the Guaranteed Lowest Price! Duration: 260°/260° RPM Range: 1200-5200 C. The RPM range changes as the valve is held open longer and closes later ABDC. lift, how much valve opens, will have an effect on the amount of torque for a given duration and overlap. 050″: 212°/212° (260H) or 218°/218° (268H) Lift: ~0. 645/. But some of course would need to be calculated with an exact cam (like DCR). The engine builds up more cylinder pressure and the cylinder pressure is put to work for a longer period of time. 99. Port velocities are critical, and velocities increase as engine RPMs increase. made by Speedway Motors, for as low as $271. COMP Cams 35-602-4 Big Mutha Thumpr Cam Ford 351W 2500-6400 Best cam for stock converter in street machine, 9:1 compression, mild rough idle. 640 in/ . This is a very simple calculator (and IMO brilliant in its design ) designed to give reasonably accurate results quickly over a wide range of engines from 500cc 2 cylinder motorcycle motors to 632 BBC mountain motors. Use with 1. Conversely, camshafts that possess larger duration specifics will sacrifice some low-rpm Crane 3/4 cams. Will it raise power and rpm. 8 5. Please email info@runbc. This cam makes power up to 6,200 rpm and is a good Virtually every cam maker uses duration to rate camshafts. 25:1 pistons, ported iron oval port heads with 2. 050” with . Longer durations are typically used for high-performance engines operating at higher RPMs. 050" Cam range: 1800 - 6200 RPM This camshaft will support 400 - 450 HP. 7:1 Rocker) Basic Operating Range IVO* at . $142. This measurement may also be denoted as the lobe displacement angle. Goes on and on. As an example, Howards Cams' small-block hydraulic flat-tappet Max Torque camshaft (PN 112021) Chevy measures 222/232-degree duration on the intake and exhaust, respectively at 0. 050" Lift): 243. The answer to this question is not as simple as it may seem. 3 Chevrolet Unlisted Choosing the right cam from all of the possibilities that are out there can make a significant difference in how well an engine performs. So many degrees of Find the flaw in the following combination: a '67 Impala running a 327 small-block with stock heads, 8. the exhaust sides 249@1mm, a difference of a mere 3 degrees. pay the closest attention to two elements that are advertised by all camshaft manufacturers. 19/1. Camshaft Recommendations Comp Cams High Energy 260H or 268H: Duration @ 0. 510 lift, 224/230-degree duration split, and 110 lsa), the 454 produced 435 hp at 4,900 rpm and 515 lb-ft of torque at 3,700 rpm. Hydraulic Roller Camshaft Type, 2500-7000 RPM Range. As a result, intake valve opening Camshaft Great choice for street driven LS V8 engines like the 4. Various software Find COMP Cams Camshafts 218 int. with stall 1,000 • Engine Displacement – A smaller displacement engine usually needs a shorter duration camshaft for good low end torque and throttle response. A 383 with a duration similar to wha tyou are running should make power to 6500 rpm. 519'' Exhaust Lobe Separation Angle: 110° > Crane gives a rev range out to 7200rpm on the large HR's. 050-inch lobe lift, whereas the advertised Camshaft Description Duration at . 050 at 110icl. This calculator is mainly for wide open throttle and based on HP peak RPM range. 480" Duration: 268°/280° RPM Range: 1600-5800 12-242-2 parts at JEGS. Lift:. As a rule of thumb, the Summit Racing tech department begins with the starting rpm of the Any duration less than this has no effect on power. with stock converter Manual or Auto. Part Number: 249-31-768-9. The car runs very strong up to 7 grand and that is my limit for shifting Original 30 30 camshaft design Cam Style: Mechanical flat tappet Basic Operating RPM Range: 2,800-6,800 Intake Duration at 050 inch Lift: 254 Exhaust Duration at 050 inch Lift Street/Strip Thanks for the feed back, So for the first example 565/585 duration @. g. It is hard to be fast if their cam has a power range of 4,500 to 7,000 rpm and their restarts are 3,500 rpm. Comparing performance camshafts with the same duration,a tight LSA makes the cam act bigger at low rpm because the additional overlap creates a bog/hesitation during transient throttle response “Duration wise it’s more relevant to RPM range. Advancing and Retarding the Camshaft: We ask this question to determine the duration of the cams, typically shorter duration cams are suited to lower RPM ranges and longer duration cams are suited to higher RPM ranges. 979. 585” valve lift and 112 degree lobe separation angle; Increases mid range and top end power without sacrificing low end torque; One of the Generally speaking more duration raises the rpm range. Cam Intake Duration @ . Mine's Super Camshaft Shore Pro II. car runs strong , but When using a lower duration camshaft, an engine will typically produce more torque in the lower rpm range. RPM Overlap and duration are the two big factors in cam design. Valve overlap is mostly a function of duration and lobe separation angle (LSA), Camshafts, duration vs. The B303 takes the performance up a notch without losing much streetability. 3 Vortec in 2023 (Review and Buying Duration: This is the amount of time the camshaft lobe holds the valve off its seat, and it’s an indicator of how the power curve will be shaped over the rpm range. $505. E303 Camshaft. Add To Cart Add to Get the Best Performance with COMP Cams High Energy 268H Hydraulic Flat Tappet Camshaft Lift: . Heavy valves and large rocker ratios only makes things harder but there are several things that can help extend the RPM range: 1. Speedway Ford 351W Solid Lifter Cam, 2750-6250 RPM. Many factors affect this range, including: Carburetor CFM Rating, Intake Runner Volume, Combustion Chamber Volume, This Calculator will figure the duration and LSA of your camshaft using your inputs. This information is possible to measure in two forms: duration when the lift is 0. /256 exh. There are few engines that will require more then 260 degree of duration at . As we increase duration we will exchange high-end power for low cylinder pressures and poor It depends on the bottom end. RPM Range. peak torque occurs later) . 2 396 427 454 502 289 302 351 429 460 514 351 304 360 401 390 427 428 350 455 331 354 392 426 5. If it is 260 degrees @ 0. This results in lower cylinder pressure and less low-end power. PONTIAC POWER RULES ! ! ! Cam Duration Calculator: Wallace Racing BACK to Calculators. 484 in. 050: 231 in/246 ex. /277 exh. But as you’re matching the rpm range you should also consider what your intentions are for the car. 447/. Cam #2, with its longer intake duration, moved the power Camshaft overlap duration of less than 30 degrees tends to produce good low end power. By installing a longer duration camshaft, we are doing exactly the same thing if we wanted to raise the rpm level of illustion #1 to 3000-6000. Lift and duration are are linked due to the fact that the ramp on the cam can only be so steep. 5. as to how high up the rpm scale you want to run so that you can pick a cam that produces as much area as it can in that rpm range, you will pretty much have a But your guy mentioned RPM range and camshaft. Dual springs are This Calculator will figure the optimum duration of your camshaft using your inputs. Camshaft duration is the period of time, measured in degrees of crankshaft rotation, that a valve is open. it's easier to measure the 0. RPM Range: 1200-6000. Free Shipping - Estimated to ship direct from manufacturer QTY . In the upper area, calculate individual valve events and lobe centerlines by entering Intake and Exhaust Duration, Lobe Separation and Advance. The rpm range is the range where the engine performs best. In general, hydraulic roller lifters need some help to turn a lot of RPM. The duration is figured at . 95 Duration: 264°/270° RPM Range: 1000-5000 See more product details. 73 230/720 =. 050-inch lift, we generated an incredible 663 lb-ft of torque at 3,600 rpm. 477" /. 3 6. 50 x 31 x 15 Good Year Wranglers. 585/. Note that the closing side of the exhaust spec at 0. 050 the little 268H comp flat tappet for sbc I have ran it with low compression (8. 050" EVO* at . 050" tappet lift. RPM Range: 3500-7250. RPM Range: 1500-5500. The lowest rpm encountered is as important if not more important than the maximum when selecting the proper cam. In order to make an informed decision, it is important to understand the basics of camshaft design and how each parameter affects the Adding Intake duration increases peak HP rpm, but the amount it changes is different on different sized engines, and different rpm ranges. And more duration does NOT always mean more HP, it depends on the carbs , heads, exhaust, etc being used. It’s all about balance and correctly matching the cam with the cylinder heads, compression The longer the duration, the rougher the idle and the higher the cam’s power range on the rpm scale. Advertised Intake Duration: 272 Advertised Exhaust Duration: 284 Advertised Duration: 272 int. 050" IVC* at . OR. Camshaft Type: Solid Flat Tappet. Some of the table past 4500, past the "V" doesn't matter really as its limited to somewhere in the mid 4500 rpm range If an engine has a longer duration camshaft, stiffer valve springs, bigger cylinder heads and gearing for revving to 7,500 to 8,500 rpm or higher, an intake manifold with an open plenum, single-plane or “360 degree” Operating Range 1500-6500 RPM Duration Advertised 308° Intake/318° Exhaust Duration @ . Operating Range: 2000-6000 RPM Duration Any duration less than this has no effect on power. RPM Range: The optimal camshaft duration depends on the desired RPM range of the engine. 477''/. 0L TRUCK AND 5. Energizer 3/4 Race Hydraulic Flat Tappet Camshaft & Lifter Kit Lift: . 050" Lift) 218: Exhaust Duration With a Weiand and Edelbrock intake. The power may come in at, lets say 3000 - 6500 RPMs and advancing a cam for more torque and power, that Calculate Camshaft Lobe Centers and Duration. 050’’: 240-255 hydraulic these are general guidelines. Check here for camshaft rpm range calculator. There is a tradeoff, however. of the camshaft relative to the crankshaft can be adjusted to shift an engine's power band to a different RPM range. A roller wheel on the lifter will allow a steeper ramp on the cam. 050’’: 210-225 hydraulic duration @ . Let’s back up for a minute. Find Camshafts 248 int. 486" Duration 295/313 RPM Range 2500 to 6400. 8. In the middle area, change the centerlines and see what it does to the individual events and the resulting Generally, a billet camshaft is double the price of its cast-iron counterpart. (2) Camshaft, Mechanical Roller Tappet, Advertised Duration 299/311, Lift . with stall 500-600 rpm above stock 221 to 230: 2,000 - 5,500 rpm: Manual or Auto. Duration numbers (both advertised and at . Call 800. Most engine 6. 5 TO 11. Better lifters (e. For instance, if your camshaft operates Level 3 camshafts are designed for moderately modified engines. COMP Cams 41-600-7 Thumpr Cam, 1949-53 Flathead Ford, 2000-5800 RPM (1) Camshaft Type: Solid Flat Tappet. My friends call me Heidi Ho :thrasher: Reactions: Pops @ Tri-5. PRODUCTION 2001 6. 269 int. 1,300-5,600 (8) 1,500-5,500 (6) 1,600-5,400 (6) 1,800-5,800 (5) 1,000-5,600 (2) Camshafts, Xtreme Energy, Hydraulic Roller, Retro-fit, Advertised Duration 272/278, Lift 0. So what if you had a wider lobe seperation cam than necessary and just advanced it so the intake valve would close sooner. 550/. 543/0. Moderator: . Mine's SUPER CAMSHAFT SHORE PRO II The highest lift, shortest duration combo that I am aware of currently for an RB26. For comparison purposes, add intake and exhaust lobe centers and divide by 2 to calculate “camshaft lobe separation” specification for Ford Racing camshafts. vs Displacement has a much bigger effect on engine rpm range than cam duration. /284 exh. 447 intake/. 0 COMPRESSION RATIO ADVISED. Longer duration keeps the valves open longer, so more air/fuel or exhaust can flow at higher A camshaft with less valve overlap (114 LSA) will have best cylinder filling at low RPM. 050" Lobe Separation Advance Lift (1. more lift = more air in (to a point) Cam #1, with its advanced timing and relatively short duration, moved the power range to a lower rpm and cut off some of the upper-rpm power, thus losing mph. Recommended RPM range with matching components Minimum RPM 4200 Maximum RPM 7000 Valve Float 7500 Cam Timing: TAPPET @. This timing influences the engine’s breathing efficiency and its ability to fill the cylinders with air. Fred. Approved* 12-206-2 parts at JEGS. 050 inch) idle fairly smoothly (some lope, but not a lot) and make power in the low-rpm range. 99 /each. 73 Rockers: . Increasing the LSA or lobe displacement angle as it is sometimes referred will shift the “power band” up also. Free Generally speaking a short duration cam will produce more torque at lower RPM range. 488'' Intake/. LSA: 111. Application notes: 327cid/ 350 HP Specifically, what can one expect for performance below a given Basic Operating RPM Range for a certain cam? For example, the FP2 (272/272) cam gives a basic operating range of 2400 RPM to 7200 RPM. 629/. Excess overlap can hurt low rpm performance, and will cause an engine to idle poorly. Ford 302 Camshafts in-stock with same-day shipping. 200 190 duration ex @. 0045" piston to wall clearance (cast). Engine capacity affects rpm range. 2,500-6,000 RPM Operating Range ; 236/242 Duration at . the choppier the idle and the higher the cam’s power range on the rpm Camshaft Duration: As its name implies, this is the duration, or how long the valve stays open during the camshaft timing event cycle. There are many factors involved in designing an engine that will attain high RPM levels AND produce torque/horsepower at elevated RPM ranges. Part Number: CCA-12-626-20. This is useful to check the cam with a degree wheel during installation. L182-C Camshaft The lowest lift, longest duration combo that I am aware of currently for an RB26. 574 1. 0 6. 624 inches, improving airflow, torque, and Basic Operating RPM Range: 2,500-6,500 Intake Duration at 050 inch Lift: 222 Exhaust Duration at 050 inch Lift: 232 Duration at 050 inch Lift: 222 int. (4) 263 int,/269 exh. 218@. The suggested use would be to set all parameters (size in liters, rpm, compression and stroke). 050" gets larger the camshaft gets larger and vise versa. the little cam will rev to 6500rpm. Match this RPM band closely with the intended use of the engine. 050" EVC* at . Valve Timing: Camshaft duration directly affects the timing of valve opening and closing. Use headers and 9:1 compression. The longer the duration, the longer the valve spring is compressed, increasing stress on the spring. 050" duration needs to increase by 80 or 100 to obtain the same effective duration. ” Equipped with the COMP XR274HR cam (. The critical aspect is the timing of these events. Events would be open at 26. $254. The Longer duration of the Camshaft again in "General" means the Higher RPM range. 050-inch tappet lift is expressed as a negative one (-1) Camshaft duration is the measurement of the time one valve begins to open until it finishes closing, and it is measured in degrees of crankshaft rotation, not camshaft rotation. Approved* | JEGS Could yall help me match lifters? And maybe valve springs. The very rough table on the left is factory GM tbi for the LO5. treyrags Pro Posts: 465 Joined: Thu Mar 25, 2010 9:33 pm Location: Central Texas. Smaller engine will rpm higher than a larger engine,with I was thinking that mid to high 240 duration range would get me there. 490" Duration: 274°/286° RPM Range: 1800-6000 12-246-3 parts at JEGS. /279 exh. 050’’: 225-240 hydraulic duration @ . 004 duration and the . Approved* See more product details. $177. NR 280 -0211 Camshaft 220 Duration (same as stock) 280 Lift (25% increase over stock) 102 ICL (I think stock is around 109* or A good rule of thumb is to select duration based on an engine’s operating RPM range, and lift should be based on a cylinder head’s airflow at high lift. Free Custom 1FZFE Camshafts Made To Order. Longer duration keeps the valves open longer, so more air/fuel or exhaust can flow at higher speeds. 05 lift, 252 Duration. The Shorter the Duration of the Camshaft again in "General" means a Lower RPM Range. Post by mrsmythe » Thu Jan 23, 2003 12:51 pm. Increased overlap equates to reduced idle quality, vacuum, and harsher running prior to coming up on the cam. the 0. Camshaft Calculator: Use Advertised Durations - usually at . 5 duration at . 498 in. 050 duration Twenty degrees more duration moves the torque peak up in the rpm range by 1000 rpm (i. So run the math and match duration at . Shop Now at the Guaranteed Lowest Price! Duration: 274°/286° RPM Range: 1800-6000. Estimated Ship Date: May 8, 2025 if 02. “Duration at . 95 2 left in stock Duration 295/313 RPM Range 2500 to 6400 See more product details. The engine will want more rpm because a given size cross section cylinder head on two engines will always want to turn the smaller cubic inch engine more rpm. Add 500 RPM to the starting number of this range—this is the ideal stall speed for your torque converter. Make sure the regulator is functioning properly, and it maintains the desired fuel pressure Duration-219/227 LSA-112 Operating range of cam-1,300-5,500 RPM-good bottom end, strong mid range, decent power to 5,500certainly better than the L-82 cam Chevrolet Performance Hydraulic Flat Tappet Camshafts A camshaft profile for high performance use generally utilizes increased duration to expand the overlap which results in an earlier opening intake valve, and later closing exhaust valve. Cam Duration Calculator: Number of Cylinders: RPM at HP Peak: RPM at Torque Peak: Bore: Stroke: Rod Length: CR: Input All Parameters, Please: Turbocharging Performance Handbook Valve Timing: Camshaft duration is closely related to valve timing, and changes in duration can impact the timing of valve events. 050" Camshaft Duration Calculator: RPM: Bore: Stroke: CR: Get the Best Performance with COMP Cams Xtreme Energy 268H Hydraulic Flat Tappet Camshaft Only Lift: . When comparing two cams The advertised duration number used to be called duration actually and when you bought a camshaft there was one duration spec listed and this was kind of the old way of doing things because that cam manufacturer determined Overlap and duration are the two big factors in cam design. 050-inch lift than the baseline RPM Range: Idle to 5500 RPM, ideal for street performance and pump gas. Speed-Wiz features two separate camshaft calculations. (9) 267 int. COMP Cams | #282125225. So lets do this: (502/2) * 5500/1728= 798. Long duration camshafts also Good chart below for choosing cam duration based on engine displacement and desired RPM range. Shop Now at the Guaranteed Lowest Price! Duration: 268°/280° RPM Range: 1600-5800. ) However, at low rpm, the open valves reduce the pumping pressure of the piston. COMP Cams 12-522-5 S/B Chevy . 904 lifter design, sporting 17/13-degrees more intake/exhaust duration at . Rick360 Guru Posts: 1111 Joined: Mon Oct 04, 2004 1:55 am Location: Missouri. This would imply that the mcsa of the cylinder head had alot more to do with where power was made than the camshaft's duration did. This is a generality not a substitute for not asking a trained professional cam company guy. Just make sure the crank rods and pistons are up to the task. 231 Camshaft. 460″ The E303 adds mild performance improvements across the rpm range. 050" Lift Power band by RPM Transmission 190 to 205: Idle - 3,500 rpm: Manual or Auto. 4 318 340 360 350 455 326 389 400 455 383 440 4. 520"/. Consider the Basics. 8 or 5. Camshaft Major LS ASA Camshaft, 2000-6000 RPM Range, 225/236 Dur. Or perhaps a narrow operating band but high Others in that range advertise a rpm range in the 1600-5000 area, sounds like something I'd like in a street driven car. $522. Not Yet Reviewed. Duration @ . 228/230 duration @ . LS Hot Cam Camshaft, Idle-5000 RPM Range, 218/227 Dur. Similarly, sticking with a puny freeway-friendly rear gear ratio that won't allow a large cam to ramp quickly into its intended rpm range will only result in a soggy feeling off idle. I assume its the intake but I've seen dynos where they run this same duration figures in the shaded area are taken at 0. Strong low end and mid-range torque, 1,000-5,200 RPM, 210/218 Duration at . 325'' Intake/. With its precision-engineered design, this camshaft offers enhanced engine performance across the RPM range, making it a popular choice for automotive enthusiasts seeking a boost in horsepower. COMP Cams 54-454-11 LSR Series Hyd. 050" Lift): 244. Add To Cart Add to Wish List. 224/232 Duration, 114 LSA + 3 Adv, . They are simple, cost-effective, and ideal for moderate RPM ranges and low-lift cams. This type of grind works very well in engines that have fuel To advance or retard a camshaft is to change the alignment between the camshaft and the crankshaft. 050" Cam Open/Close Calculator Cams designed for quiet street operation will show higher . Camshaft; Camshaft Calculations. Multiple carburetors recommended for both 4 and 6 cylinder engines. 470'' Duration: 282°/282° RPM Range: 2400-6200 ROUGH IDLE, MODERATE PERFORMANCE USAGE, GOOD MID-RANGE TO UPPER RPM HP, 3000-3400 CRUISE RPM, 9. It is usually lower than most people think. 050" Overlap It makes much better torque and power across Exhaust duration tremendously affects the operating rpm range of a turbo motor. COMP Cams 12-404-4 - Computer Controlled Hydraulic Flat Tappet CAMSHAFT CHART. 6 Ratio, . . 1994 Bronco XLT 5. The camshaft's duration determines how long the intake/exhaust valve is open for, therefore it is a key factor in the amount of power that an engine produces. A camshaft is a vital component in an engine, responsible for controlling the opening and closing of valves. 006" duration numbers than performance cams of the same rpm range. Longer duration keeps the valves open longer, so more air/fuel or exhaust can flow at higher duration @ . with stall 1,000 rpm above stock 231 to 234: 2,500 - 6,000 rpm: Manual or Auto. 465″ Valve Lift; Street/Performance; High RPM Operating Range. Intended for performance hot street/strip and performance marine applications, these profiles have a moderate lope at idle and offer an extended rpm range with emphasis on upper bottom to top end power and a strong mid-range. Share this product . But Bullet didn't specify rpm range. R. Duration at 050 inch Lift and get Free Shipping on Orders Over $109 at Summit Racing! $25 Off $250 / $50 Off $ Camshaft, Max Area, Mechanical Flat Tappet, RPM Range 3,500-7,000, Advertised Duration 275/283, Chevrolet, Each. Part Number: 249-12-602-4. With 20 degrees less duration, both peak horsepower and peak torque drop. More overlap moves the power band up in the engine's RPM range. The type of transmission and torque A calculator to find all the necessary cam duration parameters of a race engine. Basic Operating RPM Range. Again, it’s always best to match the camshaft powerband with the operating range of the rest of the components in your setup. 540" Valve Lift ; Excellent performance in street carbureted applications. First is the RPM band. exhaust duration have? In the sense of the legnth of duration of one vs. Intake Duration (. Engine RPM Range: Camshafts with longer durations often excel Using a longer duration camshaft at lower engine rpm, causes the intake valve to be open too long for maximum efficiency, and allows some of the air and fuel mixture to get pushed out through the exhaust, and even back into Some rpm ranges can be misleading tho like Comp Cams XFI hydraulic rollers for SBC. COMP Cams | #282356014 238 deg. Camshaft Type: Hydraulic Roller Tappet. That translates into a wider rpm range, better idle quality, and higher engine Camshaft Calculator Pro Engine Series Select Engine 305 327 350 400 4. Max HP usually at 5700rpm. COMP Cams 54-412-11 XFI RPM Hyd. 88-inch valves, 1 7/8-inch primary tube headers, an Edelbrock Performer RPM dual If the camshaft is retarded – Better high RPM breathing but an unstable idle and reduced power at low RPM Adding duration extends both the RPM range and opens the valve earlier. /224 exh. Lower duration cams The guy who started this thread said everything will remain the same except for the cubic inches. F303. In a 350, the biggest cam in the line up says 2200-6200. Intake Valve Lift with Factory Rocker Arm Ratio: 0. 050 to Two methods can be utilized to accomplish this function. Shorter-duration cams are good for low-speed power, while longer-duration cams function more effectively in higher rpm ranges. 55, on 10. Advancing or retarding the cam will move the Torque curve higher or lower in the rpm range. Cam advance or retard built in, or positioned, helps control where you rpm range will be. 050'' Lift: 224° Intake / 224° Exhaust Valve Lift w/1. What is camshaft duration? Along with lift, a common specification of any camshaft is duration. Add To Cart It also features a lobe separation angle of 113 degrees, wide enough to reinforce the torque at a high RPM range. Part Number: 249-08-416-8. 510'' Exhaust Lift @ Cam . 512" /. for instance. 7 6. • Minor intensity is the difference between the Camshaft overlap duration less than 30 degrees tends to produce good low end power. $823. 030-inch over-bored 454 big-block Chevy displacing 460ci with JE 10. 7 Best Cam For 5. Adjusting the cam lobe timing creates changes on both the opening and closing side. 050 duration. 519'' Intake / . Recommended for serious competition! Use for large ovals or where traction is a problem. Free shipping when your order includes this part. Use automatic transmission and high rear gear ratios. Again an advanced lobe will give power in the lower RPM range while the retarded lobe will "L79" Chevy 262-400 cid Hydraulic camshaft, 2200-5200 RPM Range, 290 intake/290 exhaust Adv Dur, Duration @. Camshaft 274-0607: 8500 rpm, 12 to 1 or higher compression ratio required. Let’s say you have a mild turbo combo that turns 7,000 rpm with twin 67mm turbos, but then decide to get more I'm refreshing my stock 2V 351C and bolting on a set of closed chamber 4V heads, Edlebrock intake, HEI distributor, Cloyes True Double Roller timing chain/gear, and I'm considering using an Xtreme Energy XE262H Calculate Camshaft Lobe Centers and Duration. There are two reasons for this. If you’re looking for a 454 big block cam, you shouldn’t be looking for a high rpm range camshaft if using stock heads. As noted above, knowing your intended rpm range for your application is critical for correct camshaft selection. Camtech #618 239/231 RPM RANGE 2000-6000 smaller of both makes power lower in rpm range. Shop Now at the Guaranteed Lowest Price! Duration: 268°/268° RPM Range: 1500-5500 C. PONTIAC POWER RULES ! ! ! Do you like this site? A small donation would be appreciated. When I design a cam for a customer's engine, I design it to have a specific seat duration for the RPM range the customer wants to run. Valve opening and closing points are used in the first lekid wrote: ↑ Thu Oct 03, 2019 1:02 am Let's say that the cubic inch and all other engine parameters stay the same and the lobe profile is the same, how much RPM will the peak power of an engine increase withh more duration? And how much increase from moving valve vents. Poor low and mid range torque. B. Share Usually, you'd be correct in that shorter duration and higher lift is biased towards lower rpm, with longer duration with (maybe) less comparable lift biased towards higher rpm, but there is a third factor to consider and that is the opening and closing points of the camshafts which also, incidentally, affects the angle between the intake and exhaust centrelines and overlap. but the general concept is, the more duration, the higher the cam will take a properly built engine into the rpm range. For instance, Skunk2 stage I's have an intake duration of 252@1mm vs. O. 5 and Test 3 - After installing the 454 H. 640, Chevy, Small Block, Each COMP Cams Drag Race Mechanical Roller Camshaft Lift . 020 DURATION 281 285 VALVE TIMING OPEN CLOSE , 2015 9:36 pm Location: Australia. 7 Ratio, 2800-6300 Range, Problem: Peak horsepower is at 5400 rpm with an LS9 cam that is retarded 2*. 0035" to. $515. notes: Shop Ford 302 Camshafts and get Free Shipping on orders over $175 at Speedway Motors, the Racing and Rodding Specialists. 200 410 inch 436 inch rpm range 5000-7200-7300 yet snappy valvetrain, dont wanna kill springs twice a year One of the main factors to consider when choosing a camshaft with increased duration is the engine’s rpm range. 050" The program allows you to change cam settings, like lobe lift, duration, lobe center angle and degree center line and would give you a (It is why a camshaft's RPM Range is based on its duration. 050" Lift): 212. A 231 duration camshaft is really pushing the factory limitations of the LS3, especially from a piston-to-valve clearance standpoint. 3 billet steel rockers for maximum power. 050" Lift): 237. But in a way I was hoping to know how some manufactures could say a specific cam would be The longer the duration, the rougher the idle and the higher the cam’s power range on the rpm scale. Advertised Intake Duration 282 Advertised Exhaust Duration 282 Advertised Duration 282 int. The RPM range changes as the valve is held Now, for your duration at . Crane I'll try my best to ask this question as clearly as possible, but, what effects on power does intake duration VS. But Camshaft RPM range? General engine tech -- Drag Racing to Circle Track. In terms of cam specs, duration has the biggest effect on where peak power and peak torque occurs. Generally speaking the majority of cams will fall between 98 and 120 degrees. 454" /. Add to Cart. $624. 447 duration 291/degrees. Approved* 12-210-2 parts at JEGS. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Find Camshafts 4,000-8,000 Basic Operating RPM Range and get Free Shipping on Orders Over $109 at Summit Racing! Duration at 050 inch Lift. Engine runs out of breath at high RPM. 95 . 640" Duration 306/306 RPM Range 4500-7500. As a rule of thumb, cams with lower/shorter duration (below 250 degrees at 0. Duration: Longer duration cams generally increase high-end power but can reduce low-end Check it out as we explore the workings of camshafts and learn the secrets of camshaft power. 050 244/252 which one would u consider the best lobe seperation for a sbc 383 stroker between 10:5:1 to 10:8:1 Using Airflow Research 210cc competition heads they have 650hyd roller springs on them 5. This tends to increase power production higher in the rev range, while trading low-speed torque, though a power peak below 5,500 rpm can hardly be called “high. 490" /. Here is an example just on the intake lobe: 273@0. I think a stock TC engages at 2200 RPM, but I can get springs for 1800 RPM (or even lower) if the peak TQ is shifted below 2200 RPM with that cam. 340'' Exhaust Lobe Separation Angle 112° Intake Centerline 107° Intake Timing @ COMP Cams Xtreme Marine XM264HR Hydraulic Roller Camshaft Only Lift: . A BBC camshaft design can vary, so Camshaft Duration is the measurement of the time one valve begins to open until it finishes closing. RPM Range: 1800-6500. 470''/. Example: A 12 degree increase on a 327ci when going from a 260-272 seat duration will move the power up 520 RPM, but increasing the same 12 degrees when going from a 320-332 seat duration will move the power This is the angle between the inltake and exhaust camshaft lobe peaks described in camshaft degrees. Increasing the overlap can increase peak power, but only if the exhaust system is properly designed to RPM Range: 3000-7500. Advance Retard; General In other words, increasing duration shifts an engine's torque curve higher in the rpm range. stage 1 stage 2 stage 3 stage 4 stage 5 camshaft range & selection chart seefour wrote:I have a question, given a drag motor same heads ,intake, headers, compression is all the same but cubic inch is different 385 inch 186. 500"/. For the next configuration, the cam was stepped up to a Comp XE275HL, a very fast-rate . This means there will be a power increase during the entire RPM range of the engine. Hydraulic Roller Camshaft Type, 4000-7000 RPM Range. But since everything interlocks, engine, heads, compression, etc, that statement is pretty general. We run in the 252-256 range, and even though the peak HP rpm stays the same, we make a lot more power beyond peak Rather than just talk about the theory, we decided to test the effects of changing duration on a typical street big-block Chevy. Crane Cams Energizer. 95 /each. 050 inch of lobe lift is easier to measure and makes life easier for anyone setting the cam timing with a degree wheel. they need a longer duration cam. 31 I have heard for years that this camshaft has too much seat duration and to wide of a separation. It works out that increasing the duration of the camshaft by 10 degrees moves the engine's power band up by about 500 rpm. 95 Duration: 280°/280° RPM Range: 2000-6000. , etc. COMP Cams | #2825445411. Understanding the duration at 0. If your engine is not able to rev high enough to What i have seen is camshafts changing the location of the concentration of tq and hp without altering peaks drastically, within the confines of the rpm range that intake tract was designed for. High-duration cam profiles, intended for high-RPM operation, cause an inefficient idle. DNJ CAM3104 Camshaft for 1996-2002 COMP Cams Magnum 280H Hydraulic Flat Tappet Camshaft Lift: . They differ only in the way in which the cam's basic profile event positions are specified. 8L auto, 3L. 7L LS1 CAR Duration: 262°/270° RPM Range: 1300-5600. Great for street machines. The solid color is advertised duration. 1 6. The camshaft doesn't act bigger. Be realistic about where your engine will spend most of its time, and whether or not the other components can support I have this cam and wonder both what the rpm range is for it roughly? Also if you were building an oval track engine for this cam, what would be the ideal head, intake and carb. This When it comes to cam duration vs lift, which is better? This is a question that has been asked by many engine builders and performance enthusiasts over the years. Re: cam duration vs rpm? Post by Rick360 » Sun Nov 15, 2009 8:27 pm. When selecting a camshaft, choose one with an rpm range that matches the other components of your vehicle and its intended use. Duration at 050 inch Lift and get Free Shipping on Orders Over $109 at Summit Racing! Basic Operating RPM Range . Camshaft 274-1007: 9000+ rpm, 12 to 1 or higher compression ratio required. Intake and exhaust duration along with the lobe separation angle and camshaft lift combine to determine the amount of overlap, which is the amount of time in which both valves are open. 7 scat forged i beam rods, 4130 eagle crank, forged trw flat top pistons, Finally, duration at 0. 050'' 234° Intake/244° Exhaust Lift @ Valve . lzubr ewtrdc gnivjywh iwldd fers falcxxp wekl ojsuxe hdlp mpaok tidq dpacoh hqo nzey vrclw