- Joined
- May 7, 2005
- Messages
- 7,208
But the loss in dynamic CR is normally at low revs when a lumpy cam is installed like the Combat 2S cam, but at high revs the same cam does not have a loss in dynamic CR and could even gain as the air at higher revs behaves differently. Its the same on an ECU where the VE (Volumetric Efficiency) can be over 100% at mid range revs because more air is being pulled in that the cc's of the engine and you have to increase the fuelling to keep the mixture correct.In many cases, engine builders raise the static CR when a faster cam is mounted to compensate a loss in dynamic CR.