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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET35 to valve guide clearance
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<blockquote data-quote="LoneStar" data-source="post: 126769" data-attributes="member: 585"><p>Interesting information! But, doesn't the scheme using the inlet close just substitute one arguably meaningless figure for another? </p><p></p><p>After all, what you care about is the maximum pressure of the compressed mixture. The inlet valve is kept open after BDC for the purpose of allowing in extra mixture at speed, from the momentum of gas flow. Rather than reducing compressed pressure, this cam timing is designed to increase it. </p><p></p><p>So, the "effective stroke" calculator gives a lower CR that's not reflected in compression pressure while the engine is running. Not very useful. Or am I missing something?</p></blockquote><p></p>
[QUOTE="LoneStar, post: 126769, member: 585"] Interesting information! But, doesn't the scheme using the inlet close just substitute one arguably meaningless figure for another? After all, what you care about is the maximum pressure of the compressed mixture. The inlet valve is kept open after BDC for the purpose of allowing in extra mixture at speed, from the momentum of gas flow. Rather than reducing compressed pressure, this cam timing is designed to increase it. So, the "effective stroke" calculator gives a lower CR that's not reflected in compression pressure while the engine is running. Not very useful. Or am I missing something? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET35 to valve guide clearance
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