Thread: Calculating C/R
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Old 09-08-2007, 05:46 AM
BDR561 BDR561 is offline
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Join Date: Jul 2007
Location: Odessa (Tampa), FL
Cobra Make, Engine: BDR 559. 410 Stroker 72 block AFR205 Heads, Solid roller lifters, Comp Cams XR286, Eagle 4" stroke internally balanced with chevy journals, Oliver rods, Probe Forged pistons, Mighty Demon, Super Victor, MSD Digital 6.....
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Default Calculating C/R
Thought I would verify my C/R as I'm trying to figure out my gas needs, currently running a 50/50 blend on C113 and 93 with no issues and a nice clean burn. Would like to know my actual fuel requirement...

Using the KB claculator I come up with a 12.30 static C/R, is this right for the following combination?

Head Volume: 58cc (AFR205)
Piston Volume: 5cc (JE piston 232459)
Gasket: .039 (Felpro 1011-2)
Bore: 4.040
Deck Clearance: .015 (72 block with .015 decking (9.480 - .015 = 9.465)
Stroke: 4.0

Would like to calculate Dynamic, but I don't have the spec for intake valve closing for the Comp Cams 35-781-9

Rod length: 6.2

Anyone able to verify and also help with the Dynamic?
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