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Hot Saws
Saw Building 101
The myth of high compression in 2-strokes
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<blockquote data-quote="trappermike" data-source="post: 6555107" data-attributes="member: 66439"><p>Well it depends on what your motor is for. Since chainsaws mostly run at high rpms,bottom end or mid-range power is not much of a consideration,I would say (roughly) 130-145 for a race engine,150=160 for a work engine wanting good realistic power.</p><p>Go for better port timing,not high compression.</p><p>Of course you can run more compression,I wish I had a formula to show how much HP it takes for comp.at a certain rpm etc.,but it doesn't exist. Lotsa people are gonna call me wrong,I can't wait...</p><p>I would go for as much ex. duration as I can while still maintaining 150-160 compression. That's the key.</p><p>If you go over 160-170 midrange power will increase but higher rpm will suffer.It may be a good woods saw but won't win races.</p></blockquote><p></p>
[QUOTE="trappermike, post: 6555107, member: 66439"] Well it depends on what your motor is for. Since chainsaws mostly run at high rpms,bottom end or mid-range power is not much of a consideration,I would say (roughly) 130-145 for a race engine,150=160 for a work engine wanting good realistic power. Go for better port timing,not high compression. Of course you can run more compression,I wish I had a formula to show how much HP it takes for comp.at a certain rpm etc.,but it doesn't exist. Lotsa people are gonna call me wrong,I can't wait... I would go for as much ex. duration as I can while still maintaining 150-160 compression. That's the key. If you go over 160-170 midrange power will increase but higher rpm will suffer.It may be a good woods saw but won't win races. [/QUOTE]
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