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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
"Y Alloy" Pistons
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<blockquote data-quote="redbloke1956" data-source="post: 40782" data-attributes="member: 2299"><p>Thanks Chankly , I am running a new muff, new liner and new piston, none of which are Y alloy.</p><p>The question on Y alloy is for another project I am currently working on but your info is relevant all the same, the liner in my Comet is not, unfortunately, a snug fit....the new liner has a cold clearance of probably 2 or 3 thou...not much I could do about that I am afraid.</p><p></p><p>The Y alloy piston that is in the current project has only about 2 thou clearance, which I hope to open up in the next few days, the engine has been running previously but I have no idea for how long as the previous owner has passed away, I am a comparative novice on this age of machinery and on a steep learning curve, relying heavily on the experience of others especially when it comes to finding information that is disappearing along with REAL mechanics and engineers.</p><p>I fully understand how us "newbies" must frustrate the bejesus out of those of you who have owned/repaired/fettled these machines for many years, but we all have to make a start somewhere, I for one would have owned a Vincent 40 years ago if I had, at that time, the wherewithall to do so, as it is I almost had to sell one of my children to purchase what turned out to be an overpriced lemon of a Comet.</p><p>So please understand my confusion when the responses received for clearances/expansion for a Y alloy piston range from 4 thou to 20 thou, especially since this engine has already been running with only 1.5 to 2 thou clearance.</p><p>I am relying on the input from those with far, far greater experience and knowledge than myself and am very grateful for it.</p><p></p><p>Thanks to all</p><p>Kevin</p></blockquote><p></p>
[QUOTE="redbloke1956, post: 40782, member: 2299"] Thanks Chankly , I am running a new muff, new liner and new piston, none of which are Y alloy. The question on Y alloy is for another project I am currently working on but your info is relevant all the same, the liner in my Comet is not, unfortunately, a snug fit....the new liner has a cold clearance of probably 2 or 3 thou...not much I could do about that I am afraid. The Y alloy piston that is in the current project has only about 2 thou clearance, which I hope to open up in the next few days, the engine has been running previously but I have no idea for how long as the previous owner has passed away, I am a comparative novice on this age of machinery and on a steep learning curve, relying heavily on the experience of others especially when it comes to finding information that is disappearing along with REAL mechanics and engineers. I fully understand how us "newbies" must frustrate the bejesus out of those of you who have owned/repaired/fettled these machines for many years, but we all have to make a start somewhere, I for one would have owned a Vincent 40 years ago if I had, at that time, the wherewithall to do so, as it is I almost had to sell one of my children to purchase what turned out to be an overpriced lemon of a Comet. So please understand my confusion when the responses received for clearances/expansion for a Y alloy piston range from 4 thou to 20 thou, especially since this engine has already been running with only 1.5 to 2 thou clearance. I am relying on the input from those with far, far greater experience and knowledge than myself and am very grateful for it. Thanks to all Kevin [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
"Y Alloy" Pistons
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