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Saw Building 101
The myth of high compression in 2-strokes
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<blockquote data-quote="ironman_gq" data-source="post: 7326447" data-attributes="member: 27462"><p>Factory motors, probably not many if any. I've seen plenty of alcohol motors in the 2-230psi range, they run hard and fast and don't last long. Static compression is dictated by a lot more than compression ratio, valve timing (port timing) has the most influence and dynamic compression is almost completely unrelated to compression ratio when you start to factor in valve timing, ignition timing, burning characteristics of the fuel, volumetric efficiency and any other variables you can think of. Many modern engines vary all of these based on operating condition (variable valve timing, asymmetric valve timing, variable ignition timing, multipath intakes/exhausts).</p></blockquote><p></p>
[QUOTE="ironman_gq, post: 7326447, member: 27462"] Factory motors, probably not many if any. I've seen plenty of alcohol motors in the 2-230psi range, they run hard and fast and don't last long. Static compression is dictated by a lot more than compression ratio, valve timing (port timing) has the most influence and dynamic compression is almost completely unrelated to compression ratio when you start to factor in valve timing, ignition timing, burning characteristics of the fuel, volumetric efficiency and any other variables you can think of. Many modern engines vary all of these based on operating condition (variable valve timing, asymmetric valve timing, variable ignition timing, multipath intakes/exhausts). [/QUOTE]
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