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Help with Compression Ratio!

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Old Oct 20, 2009 | 12:15 PM
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01SOMm6's Avatar
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Default Help with Compression Ratio!

Ive been playing around with a compression ratio calculater but cant come up with what I should have.
4.005" Bore
4.000" Stroke
.051" Head Gasket
72cc Heads
Flat Tops with -2cc Reliefs.
Any Help?
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Old Oct 20, 2009 | 01:17 PM
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Assuming your pistons are .007 out of the hole, I come up with 10.93.
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Old Oct 20, 2009 | 01:30 PM
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I have a claculator also but nothing changes if you change some of the values - like deck height. I have heard stock is .006" out of the hole, .007" out of the hole, and as much as .010" out of the hole. My new set up is .0025" IN the hole but I get no difference in compression ratio.
Specs are as follow:
Bore: 4.07"
Stroke: 4.100"
Pistons: 11cc dish
Head Gasket: .040"
Chamber volume: 62cc
Deck height: -.0025"
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