Quote:
Originally Posted by steve25
Here's my numbers.
Piston volume 50.7
Deck clearance volume .5199
Valve notch volume .4088
Head gasket volume .5736
Ring land back volume .09154
Chamber volume ( 72 CCs) 4.939
Adding all this up you get 57.23, then minus out the PV number and you have 6.532
Now divid with that and you have a compression ratio of 8.76 to 1.
If your running a gapless top ring you can half the ring back land volume.
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Steve,
You seem to like doing this kind of stuff..
Can you use the formula you posted and work backwards?
If you can, I'd go as far as using intake close for swept volume and then see what kind of combustion area is needed to get the 215 cranking psi.
Given the limited build info and known parts info the OP has access to, on this done built, as is project... I'll go out on a limb and guess the original owner wasn't looking for high rpm power. Then not knowing, had the cam advanced to get more low rpm, off idle power.
"This is only a test"
Clay