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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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<blockquote data-quote="davidd" data-source="post: 59008" data-attributes="member: 1177"><p>Ron,</p><p></p><p>I have never used the cylinder oil holes in a street engine or racing engine. I am not sure what this data means. I would not be insistent on the subject one way or another. I liked the fact that the oil would likely be diverted to areas that could better use the oil. On modern racing pistons there is not much piston skirt to oil. Most singles and racers would do much better with an oil jet squirting oil on the underside of the piston crown, but that is a tough one on a Vincent. </p><p></p><p>It is difficult to know if the Comet seizures and the presence of the oil hole are correlation or causation. There certainly have been many seizures with the oil hole in place. I had urged in Martyn's post that most Comets are built with too little piston clearance, although in Martyn's case the damage appeared to be caused by detonation. I think if the clearances are done carefully, then the skirt oiling may not be necessary. On the racers, the liners are Nicasil coated with no oil hole. All the street engines I have done have been plain liners with no holes.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 59008, member: 1177"] Ron, I have never used the cylinder oil holes in a street engine or racing engine. I am not sure what this data means. I would not be insistent on the subject one way or another. I liked the fact that the oil would likely be diverted to areas that could better use the oil. On modern racing pistons there is not much piston skirt to oil. Most singles and racers would do much better with an oil jet squirting oil on the underside of the piston crown, but that is a tough one on a Vincent. It is difficult to know if the Comet seizures and the presence of the oil hole are correlation or causation. There certainly have been many seizures with the oil hole in place. I had urged in Martyn's post that most Comets are built with too little piston clearance, although in Martyn's case the damage appeared to be caused by detonation. I think if the clearances are done carefully, then the skirt oiling may not be necessary. On the racers, the liners are Nicasil coated with no oil hole. All the street engines I have done have been plain liners with no holes. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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