![]() Most guys don,t have unlimited cash so lets design something that will last a long time without issues! One group thinks you have to finish the race to win, Than one in an engine designed to run the 24 hour race at le-mans,Įven if both cars ran in a car with a similar engine family,Īnd certainly both would be designed far differently than a cam designed, They seem more concerned with being able to produce the best possible peak power,Įven if doing so might reduce the engines longer term life expectancy.Ī cam designed for drag racing that might be expected to make peak power for less than 15 seconds at a time will be a great deal different, Of what most builders might see as reasonable for longer term durability, Some other company's have a few cam lobe designs that are right at or even at times in some rpm ranges a bit past the limits, If it required to significantly boost long term durability and reduce the chances of valve train stress levels,causing problems. Minor changes can have very significant effects on durability without changing power very much,īoth CRANE AND CROWER are rather well known of tending too design cams that might sacrifice a couple peak horsepower, Keep in mind a" LAZY " cam, might be far better for low wear and increased durability,Įngineers that design a cam and valve train, need to know whats expected,Īny cam may be significantly easier on the valve train and increased durability may be greatly enhanced or extended OR peak power might be the goal, Small Base Circle: NoCam Gear Attachment: Single-Bolt Lifters Included: Yes, PVT652394, Hydraulic Flat Tappet 472”Įxhaust Valve Lift with 1.65 Rocker Ratio. 458"Įxhaust Valve Lift with 1.60 Rocker Ratio. 487"Įxhaust Valve Lift with 1.55 Rocker Ratio. Intake Valve Lift with 1.65 Rocker Ratio. Intake Valve Lift with 1.60 Rocker Ratio. Intake Valve Lift with 1.55 Rocker Ratio. 443"Įxhaust Valve Lift OE Rocker Ratio (1.50). Intake Valve Lift with OE Rocker Ratio (1.50). Manufacturers Description: Mild idle, improved power and torque. Static compression is simply a point in calculations,Īs the engine never sees static compressionĪpplication: Chevrolet Small Block 262-400 1955-2002Ignition Firing Order: OE (1-8-4-3-6-5-7-2) Keep in mind DYNAMIC compression is the ONLY thing you need be concerned with, If you use that 17.8cc dish it will work just fine,įrom where the engine could potentially be, You also have the option of swapping cams Or retard the cam to the strait up or split duration index , Keep in mind you can leave the cam at 4 degrees advanced, Now certainly take the effort to do the required calculations for yourself,īut try to get the dynamic compression up near 7.8:1-8.0:1 It may help if you know the intake valve seat timing as some calculators will require that info Ideally youll select a piston that provides you with the required static compression. Id be looking for about a 13cc-15cc cc dish piston if its my engine build That 17.8cc dish with a 72cc combustion chamber might lower the compression a bit more than ideal. 040 quench and a 17.8cc dish piston,Īnd the chart you posted show your potentially going to be hurting your engines potential with a bit too low of a dynamic compression, if you select a deep dish piston design ![]() With a 72 cc combustion chamber on a 383 with a. Strive too get about 7.8-to-8:1 dynamic compression I would limit compression to about 9.4:1 -9.6:1 static and ![]() This results in less low-end power.Assuming you want to run cheap crap gas occasionally , However, you also move the power curve higher in the rpm range. These cams are often used for stock replacement, daily driver, and towing applications.Īs you increase the duration, you increase the peak power the engine can make. Generally, cams with smaller duration numbers make peak horsepower at lower rpm. The rpm range has a lot to do with Duration. If you have questions, the best course of action is to contact the manufacturer. There is no formula to find the rpm range for a camshaft. Many factors affect this range, including: The listed range is a result of testing the camshaft on a dyno with different combinations of engine parts. The rpm range is determined by the camshaft manufacturer. The basic operating rpm range for a camshaft is its "sweet spot." This range is where the engine will produce the most Torque and Horsepower.
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