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Old 10-01-2009, 12:52 PM   #1 (permalink)
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Speed Four Engine Compression

What should the cylinder compression of my 2006 Speed Four be? I've heard varying answers? Does anybody know?
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Old 10-03-2009, 01:46 PM   #2 (permalink)
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I'm not sure if there is a factory number out there (I couldn't find one in the manual or even anything about testing compression). However, from my own experience, an engine with 12.5:1 compression ratio should be producing between about 180-250 psi warm, depending on cam profile and whatnot. The main thing is that you want consistency within about 10% between all cylinders.
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