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Old 02-21-2010, 05:28 AM
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bulldog426 bulldog426 is offline
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Default stroking=compression?

does stroking an engine generally give you higher compression?? i know compression has alot to do with ccs of combustion chambers and pistons, but dont it seem like from the piston moving further down the cylinder, and it's sucking in more air and fuel to compress??
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Old 02-21-2010, 07:11 AM
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Swept volume into fixed volume is your static compression ratio. Thus, the longer the piston throw, the more swept volume and the more compression.
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Old 02-21-2010, 04:22 PM
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Ray Bell Ray Bell is offline
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And if the stroking involves pushing the piston further up the cylinder you reduce combustion chamber capacity... = more compression.
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Old 02-23-2010, 06:29 AM
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Dynamic compression is when things really get interesting and I get lost. Cam duration, valve overlap and rpm all seem to effect it.
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Old 02-23-2010, 01:52 PM
Rich Kinsley Rich Kinsley is offline
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I never have figured out my CR. My pistons were from Ross and for 9.5:1 comp.. The heads have stock chambers but I don't know the cc's. I don't have trouble burning 91oct gas. But my cylinders all register 185psi warm on a comp test. The starter, a Summit mini, doesn't seem to toil too hard to start it.
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Old 02-23-2010, 06:58 PM
dgc333 dgc333 is offline
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Even over boring the cylinder increases the compression because the swept volume increases.
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Old 02-23-2010, 07:18 PM
cudabob496 cudabob496 is offline
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http://www.speedwaybids.com/DynamicC...Calculator.php
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