Originally posted by Paul Kienitz:
Originally posted by lotus7:
[b]I was advised by an extremely reliable source on this board that the c/chamber vol is 47.7 cc.
I was informed by private message that the 9 cc discrepancy is accounted for by things like the thickness of the head gasket and the unfilled space around the piston. Which to me implies that the 47.7 cc figure may accurately reflect the shape of the head, but the 57.1 figure is more like what you should be using to calculate compression changes. Of course, if the compression ratio is 9.6 rather than 9.7, that makes 57.8 cc.
Since my own compression ratio was increased to at least 10.0 by shaving, I wonder how much was actually removed... the bore is 8.5 cm or a hair under, so a 1 cc difference is .0176 cm thick... boosting to 10.0 would reduce volume by 2.6 cc, making a shaving loss of: .046 cm, not quite half a millimeter. But it might well have been more than that, compression like 10.3 or something...
How high can compression go without knocking on 92 octane?
