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Cam Profile relation to real world?


I am trying to make a replica Engine but am stuck. I do not know which random number from 1-100 … It is for a turbo charged engine.


Lots of automation values don’t actually correspond to anything, you’ll have to make a guess, the lower the cam profile, the less revs you get but in theory more low end power. The higher it is, the more revs you get and higher power.


Exactly, it’s a quite simplified way of determining the cam values, in reality both lift, duration and lobe angle will affect how the camshaft works. But generally speaking, a stock turbocharged engine for the street should have a quite mild camshaft = a low number in automation. Fiddle with it until the power, torque and RPM is close to the real engine.


Another rule of thumb I like to use is this:

For 3,4, and 5-valve engines, whatever the peak power rpm is divide it by 100 and subtract 10. (So if peak power is at 7,000 rpm, I would use a “60” cam).

For SOHC and DAOHC 2-valve engines, it would be divide peak power rpm by 100 and subtract 5. (So if peak power is 5,500 rpm, I would use a “50” cam).

Finally, for OHV engines, it would be divide peak power rpm by 100 and use that number. (So a 4,000 rpm power peak would correspond to a “40” cam).

That’s just a starting point… As Knugcab and Sky-High alluded to, just play with numbers until you find what works best.