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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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<blockquote data-quote="davidd" data-source="post: 99474" data-attributes="member: 1177"><p>Ron,</p><p></p><p>Unless the manufacturer or the rings says differently, I use:</p><p></p><p>.004"/inch of bore as a gap for chrome compression rings,</p><p></p><p>.003"/in of bore for chrome oil control rings and</p><p></p><p>.003"/inch of bore gap for unplated compression or oil control rings.</p><p></p><p>Pat spoke with Terry last night and told him that there were a lot of seizures reported on the forum. He was surprised and concerned. I think he might be reconsidering his advice for the singles.</p><p></p><p>I don't use an oil hole in the liner, but if you do make sure it is in the correct position. I use aluminum liners made from 4032 that are plated. However, I was talking to Millenium Technologies recently and they mentioned that many owners put the oil hole in their drawings, so many owners use the oil hole with Nicasil liners.</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>Talk to John Healy as he has experience with squish on many engines and maybe .050" is OK for the street.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 99474, member: 1177"] Ron, Unless the manufacturer or the rings says differently, I use: .004"/inch of bore as a gap for chrome compression rings, .003"/in of bore for chrome oil control rings and .003"/inch of bore gap for unplated compression or oil control rings. Pat spoke with Terry last night and told him that there were a lot of seizures reported on the forum. He was surprised and concerned. I think he might be reconsidering his advice for the singles. I don't use an oil hole in the liner, but if you do make sure it is in the correct position. I use aluminum liners made from 4032 that are plated. However, I was talking to Millenium Technologies recently and they mentioned that many owners put the oil hole in their drawings, so many owners use the oil hole with Nicasil liners. 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. Talk to John Healy as he has experience with squish on many engines and maybe .050" is OK for the street. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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