Prius Pistons - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

03-03-2013, 03:29 PM

#11

etherdude

Drives: 2012 Yaris SE 5-speed

Join Date: Mar 2012

Location: Mass., USA

Posts: 39

Quote:

Originally Posted by cali yaris

That doesn't make sense if the Prius runs them as stock pistons?

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.

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