Show your math? I'll show you mine...


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Posted by ChrisCase [76.212.214.193] on Thursday, July 28, 2011 at 14:59:07 :

In Reply to: Re: be carefull on milling the head posted by kaegi [71.231.127.14] on Thursday, July 28, 2011 at 11:48:05 :

A combustion chamber of 85cc = 5 cubic inches. My guesstimate is that milling .060 would subtract about 1/2 cu in, so about a 10% increase in compression. 110% of 8:1 = 8.8.

A .040 overbore seems like less than 1% of added volume, and like wise less than 1% more area to be pushed on by the gases.

But MMMV form yours, I thought I was wrong once before but I was wrong then.



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