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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How critical are the rear cylinder oil feeds!
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<blockquote data-quote="davidd" data-source="post: 96768" data-attributes="member: 1177"><p>Rob,</p><p></p><p>I have never used the cylinder oil holes in any Vincent I have run. I also think the liners are a little long so, I don't disagree with Greg. I don't think the oil holes do any harm when properly installed. I have been using aluminum liners for a few decades now and I have them made short. I have never had piston problems.</p><p></p><p>I know Patrick Godet puts them in all his bikes.</p><p></p><p>I have not done a twin in a long time, but on the Comet the spindle can actually hit the right rear crankcase stud. If you have had a crankcase stud out and in your hand it has an interrupted thread. This narrowing of the stud occurs where the spindle is located. The studs are designed to be bottomed in the crankcase because they are designed to pass the oil to the cylinder at this very specific height. If someone did not pay attention to the goop in the bottom of the crankcase stud hole the oil passage cut into the stud may be too high. If it is a little off a wire might be poking that part of the stud that is too high in the hole because it is partially closed off.</p><p></p><p>In fact, on a Comet you should check the length of the spindle if you are installing a new one because you might not be able to push the spindle in far enough to get it under the steady plate. The last one I installed I had to shorten. I found this yesterday in the parts I was installing:</p><p>[ATTACH=full]22542[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 96768, member: 1177"] Rob, I have never used the cylinder oil holes in any Vincent I have run. I also think the liners are a little long so, I don't disagree with Greg. I don't think the oil holes do any harm when properly installed. I have been using aluminum liners for a few decades now and I have them made short. I have never had piston problems. I know Patrick Godet puts them in all his bikes. I have not done a twin in a long time, but on the Comet the spindle can actually hit the right rear crankcase stud. If you have had a crankcase stud out and in your hand it has an interrupted thread. This narrowing of the stud occurs where the spindle is located. The studs are designed to be bottomed in the crankcase because they are designed to pass the oil to the cylinder at this very specific height. If someone did not pay attention to the goop in the bottom of the crankcase stud hole the oil passage cut into the stud may be too high. If it is a little off a wire might be poking that part of the stud that is too high in the hole because it is partially closed off. In fact, on a Comet you should check the length of the spindle if you are installing a new one because you might not be able to push the spindle in far enough to get it under the steady plate. The last one I installed I had to shorten. I found this yesterday in the parts I was installing: [ATTACH=full]22542[/ATTACH] David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How critical are the rear cylinder oil feeds!
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