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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
"Y Alloy" Pistons
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<blockquote data-quote="chankly bore" data-source="post: 40780" data-attributes="member: 317"><p>I have nipped up a brand new Specialloid,carefully run in, with a new,well-fitting muff and liner running .004" bottom skirt clearance. I fitted a new Club piston and gave it .006" clearance and have had no problems even in heavy traffic on a 100 degree Fahrenheit day. If you ARE using a Y alloy piston read the paragraphs on Piston Clearances in "Tuning for Speed" but remember what I keep saying about modern fuels apparently burning hotter. Even if you are using a close tolerance piston I would go looser than recommended.David Dunphy certainly has the runs on the board and he gets no argument from me because I am not worthy to wash his footpegs, likewise Big Sid. I am sick of repeating ROUND LINER ROUND BORE SNUG FIT INTO CRANKCASE MOUTH also good head joint all gives the little heat devils someplace to go.I also use 95 or 98 octane fuels because a really goood engineer tells me to,and he has spent 50 years correcting other people's sorry mistakes on Vincents. Sorry if I'm sounding a little testy, I've had a trying day running in a new puppy.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 40780, member: 317"] I have nipped up a brand new Specialloid,carefully run in, with a new,well-fitting muff and liner running .004" bottom skirt clearance. I fitted a new Club piston and gave it .006" clearance and have had no problems even in heavy traffic on a 100 degree Fahrenheit day. If you ARE using a Y alloy piston read the paragraphs on Piston Clearances in "Tuning for Speed" but remember what I keep saying about modern fuels apparently burning hotter. Even if you are using a close tolerance piston I would go looser than recommended.David Dunphy certainly has the runs on the board and he gets no argument from me because I am not worthy to wash his footpegs, likewise Big Sid. I am sick of repeating ROUND LINER ROUND BORE SNUG FIT INTO CRANKCASE MOUTH also good head joint all gives the little heat devils someplace to go.I also use 95 or 98 octane fuels because a really goood engineer tells me to,and he has spent 50 years correcting other people's sorry mistakes on Vincents. Sorry if I'm sounding a little testy, I've had a trying day running in a new puppy. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
"Y Alloy" Pistons
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