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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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<blockquote data-quote="Oldhaven" data-source="post: 99511" data-attributes="member: 2879"><p>David suggests </p><p></p><p>"I shoot for .030" for squish or quench. I am pretty sure it does not work at .055". It depends a lot on how high you rev and if it is a titanium rod (due to the stretching). For street, I would think .030" to .045" would be good. I don't think that .055 will damage the performance too much, after all, you're not racing the bike, but if the piston is too far from the head it won't transfer much heat from the piston to the head, which is the "quenching" that helps performance."</p><p></p><p>I am pretty much going with whatever squish is built in, since I will not be machining the head or liner, but as you mention, I will not be racing so the extra capacity is going to be used for a little more top end or pulling power. If anything, the band will be made bigger if I need to use a thicker cylinder base basket. The piston top edge is supposed to be flush with the liner top at TDC. </p><p>I will be taking Greg's advice and grinding the liner flange to head joint. I can see the tool marks he mentioned and due to the increased bore and the fact that the liner flange has to be slightly relieved to clear the 10mm bolt diameter, the sealing area is not very wide.</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 99511, member: 2879"] David suggests "I shoot for .030" for squish or quench. I am pretty sure it does not work at .055". It depends a lot on how high you rev and if it is a titanium rod (due to the stretching). For street, I would think .030" to .045" would be good. I don't think that .055 will damage the performance too much, after all, you're not racing the bike, but if the piston is too far from the head it won't transfer much heat from the piston to the head, which is the "quenching" that helps performance." I am pretty much going with whatever squish is built in, since I will not be machining the head or liner, but as you mention, I will not be racing so the extra capacity is going to be used for a little more top end or pulling power. If anything, the band will be made bigger if I need to use a thicker cylinder base basket. The piston top edge is supposed to be flush with the liner top at TDC. I will be taking Greg's advice and grinding the liner flange to head joint. I can see the tool marks he mentioned and due to the increased bore and the fact that the liner flange has to be slightly relieved to clear the 10mm bolt diameter, the sealing area is not very wide. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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