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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
205 lbs. compression?
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<blockquote data-quote="scdmarx" data-source="post: 19040" data-attributes="member: 92"><p>Here's is thought. I don't know any specs, but this is just some idle thought.</p><p></p><p>The 1200 is a larger volume to fill. Maybe due to larger diameter bore, maybe longer stroke, maybe a little of both.</p><p></p><p>Looking at "stroke", the piston speed slows down near the end of it's travel. That being TDC & again at BDC. That makes the center area of the stroke the fastest place the piston will travel. That's were it will be able to create the most velosity for the incoming charge. (theoretically?) What if the 1200 cam is indexed to have the valve at it's most open point during that time of maximum velosity? *******</p><p></p><p>Somehow filling the 1100 cylinders more efficiently (even though we don't understand the why's and how's) seems to me like you just installed a super charger. But then, you gotta ask, at what RPM is the useable powerband? You don't even know there is one untill you go for a ride. (unless you have a dyno in your garage)*******</p><p></p><p>Are you aware that static compression readings are very much <u><strong><span style="color: #FF0000">higher</span></strong></u> than running compression readings? </p><p>If you check compression on a motor when cranking and it builds up to, say 175psi, then release the pressure and start the motor, the psi will only build up to about 40psi. I do this sometimes when I suspect one cylinder is not quite keeping up with the others and I can't see any obvious reason why. If I find one significantly lower than the others, it will varify the need to start pulling covers to find the mechanical reason such as a cam lobe starting to go flat, or a hydraulic lifter not staying pumped, etc.*******</p><p></p><p>I hope this confuses you more. :good:</p></blockquote><p></p>
[QUOTE="scdmarx, post: 19040, member: 92"] Here's is thought. I don't know any specs, but this is just some idle thought. The 1200 is a larger volume to fill. Maybe due to larger diameter bore, maybe longer stroke, maybe a little of both. Looking at "stroke", the piston speed slows down near the end of it's travel. That being TDC & again at BDC. That makes the center area of the stroke the fastest place the piston will travel. That's were it will be able to create the most velosity for the incoming charge. (theoretically?) What if the 1200 cam is indexed to have the valve at it's most open point during that time of maximum velosity? ******* Somehow filling the 1100 cylinders more efficiently (even though we don't understand the why's and how's) seems to me like you just installed a super charger. But then, you gotta ask, at what RPM is the useable powerband? You don't even know there is one untill you go for a ride. (unless you have a dyno in your garage)******* Are you aware that static compression readings are very much [u][b][color=#FF0000]higher[/color][/b][/u] than running compression readings? If you check compression on a motor when cranking and it builds up to, say 175psi, then release the pressure and start the motor, the psi will only build up to about 40psi. I do this sometimes when I suspect one cylinder is not quite keeping up with the others and I can't see any obvious reason why. If I find one significantly lower than the others, it will varify the need to start pulling covers to find the mechanical reason such as a cam lobe starting to go flat, or a hydraulic lifter not staying pumped, etc.******* I hope this confuses you more. :good: [/QUOTE]
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Classic Goldwing Technical Forums
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205 lbs. compression?
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