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KevinS KevinS is offline
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Join Date: Oct 2004
Location: Bremerton
Posts: 166
I don't have Bruce Anderson's book handy with me, but if I remember correctly he said you get about a 1 point compression increase when using 70.4mm crank in place of the 66mm. Bruce Wayne's book states that if the 70.4mm crank is used in place of the 66mm compression is raised to about 10:1 (stock is 9.1:1 w/E pistons). From this I'd guess about a drop of .9 to 9.6:1. This would probably be good if you don't plan on twin plugging and want to run on pump gas, but you will have the obvious drop in power.
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1971 Porsche 911 T Targa
Old 11-13-2004, 06:21 PM
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