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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is the cylinder oil jet needed on a Comet?
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<blockquote data-quote="davidd" data-source="post: 110252" data-attributes="member: 1177"><p>We have all done some misdiagnosis over the years. The fact is that there a lot of variables at play. The advent of low expansion pistons, the use of pistons with much smaller skirts, the use of super slippery oil (so slippery the rings may not seal), and the use of short liners and/or aluminum liners. I would think that at present, 110% of all piston seizures are a result of incorrect clearancing of the skirt to cylinder. Running small piston clearances robs the most power from the engine, more than any other component and has no obvious benefits (for me).</p><p></p><p>I think most careful builders would not find the cylinder oil feed "necessary" today. If you are doing something out of the ordinary it might be advisable to use the feeds. If you are careful with the placement of the hole and the crankcase fits, it should not hurt anything.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 110252, member: 1177"] We have all done some misdiagnosis over the years. The fact is that there a lot of variables at play. The advent of low expansion pistons, the use of pistons with much smaller skirts, the use of super slippery oil (so slippery the rings may not seal), and the use of short liners and/or aluminum liners. I would think that at present, 110% of all piston seizures are a result of incorrect clearancing of the skirt to cylinder. Running small piston clearances robs the most power from the engine, more than any other component and has no obvious benefits (for me). I think most careful builders would not find the cylinder oil feed "necessary" today. If you are doing something out of the ordinary it might be advisable to use the feeds. If you are careful with the placement of the hole and the crankcase fits, it should not hurt anything. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is the cylinder oil jet needed on a Comet?
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