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03-25-2002, 07:46 PM
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#4 |
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Registered Member
Join Date: May 1999
Posts: 5,246
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Oh, here's why.
Stock E7TE. 64cc TRW Flat top piston with valve relief. Valve relief = 5.5cc. Total combustion chamber size 64+5.5 = 69.5cc 4.030"x3.00" = 306ci. Cylinder volume = (pi)(r^2)(h) pi = 3.14159265359 r = 4.030/2 = 2.015 x 2.54 = 5.1181cm h = 3.00" x 2.54 = 7.62cm (3.14159265359)(5.1181^2)(7.62) = 627.08cc Now take cylinder volume divided by total combustion chamber size. 627.08cc / 69.5cc = 9.02. That's your CR. If you really want to get technical, stock CR would be 8.89:1 |
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