Posted by George on Sunday, September 29, 2002 at 9:28PM :
In Reply to: Re: HP as a function of compression ratio posted by George (Alberta) on Sunday, September 29, 2002 at 8:46PM :
The higher compression ratio would not decrease the charge in the cylinder, but what was there would burn to givea higher temperature and therefore more power. ....however Tim's point is interesting because he points out that milling the head on an L-head would likely have a negative impact on breathing....at some point, the decreased breathing my be greater than the thermodynamic improvement from the higher CR.
However, the factory kept increasing CR and there is ample evidence that up to a CR of 8.5 or so, increasing CR helps power. Higher CRs than 8 or 8.5 are reported to give lots of problems like blown head gaskets....so the point of decreased breathing overpowering high thermodynamic efficiency is probably not reached in normal practice.
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