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Old 02-19-2013, 10:27 AM   #51 (permalink)
mechman600
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Quote:
Originally Posted by renault_megane_dci View Post
Prius is only 13:1 static.
This gives 8.2:1 dynamic with the advanced cam phasing but only 6:1 with the late cam phasing.

On the GPZ (pretty much set on this now) I was aiming for restoring the standard dynamic CR wich is 7.261.
Don't forget that when your motorcycle engine is at peak torque, the intake and exhaust are "in tune" and VE is 100% or greater, your dynamic compression will far exceed 7.26:1. Tuned intake and exhaust harmonics effectively supercharge the intake charge, resulting in a dynamic compression ratio equal to or even greater than static compression.

The Prius cam phasing and intake/exhaust design prevents this from happening.

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