Prius Pistons

[Viperoni]

Originally Posted by etherdude

The Prius Atkinson Cycle cams have the effect of lowering cylinder pressure due to holding the intake open longer and blowing intake charge back into the intake manifold. Thus the higher compression 13:1 pistons do not result in necessarily higher cylinder pressures that the lower compression ration Yaris pistons.

QFT

Basically the dynamic CR of the 1nz-fxe probably isn't that much different than the DCR of the 1nz-fe... 13:1 is a very high static CR to start off on a regular fuel injected motor, ESPECIALLY with the stock cams.


It's just too bad nobody's come back and said what's happened.