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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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<blockquote data-quote="royrobertson" data-source="post: 176981" data-attributes="member: 2486"><p>Sorry Simon, Cycle Threads are all 60 deg. There is a BSB (Brass) thread that is 55 deg. Whitworth form but they are not really compatible but will fit.</p><p>I made my Titanium cylinder studs to the same dimensions as the originals which have very long threaded portions with an oil groove in the middle. I turned them on a friends lathe because his better lathe had a thread cutting gearbox and finished them with a hand chaser. A brand new Tracy tools HSS die just broke up when I tried to just finally size the threads, hence the hand chaser. Stupidly, I did not complain or send the die back as I should have done.</p><p>I just torque my aluminium head nuts to 30 ft,lbs and have never had any problems on my highly tuned Racer.</p></blockquote><p></p>
[QUOTE="royrobertson, post: 176981, member: 2486"] Sorry Simon, Cycle Threads are all 60 deg. There is a BSB (Brass) thread that is 55 deg. Whitworth form but they are not really compatible but will fit. I made my Titanium cylinder studs to the same dimensions as the originals which have very long threaded portions with an oil groove in the middle. I turned them on a friends lathe because his better lathe had a thread cutting gearbox and finished them with a hand chaser. A brand new Tracy tools HSS die just broke up when I tried to just finally size the threads, hence the hand chaser. Stupidly, I did not complain or send the die back as I should have done. I just torque my aluminium head nuts to 30 ft,lbs and have never had any problems on my highly tuned Racer. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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