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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Do Big Bore Cylinder Muffs Need Special Head Studs?
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<blockquote data-quote="oexing" data-source="post: 130779" data-attributes="member: 1493"><p>Greg, I spent hours thinking about matters but I am quite confident to be safe. The case threads are standard imperial, 9/16 something dia. and the very strong 7075 inserts tapped M 10 x1,5 mm standard, same like on 1000 cc BMWs for decades. They had M 10 since prewar I think, but only 750cc max then. Yes, there is an extra load on Vincent studs from acting as frame parts but I´d think less than a ton load from this so no real factor. The 460 Horex single got only M 8 studs but is allright with it, even with easy machine stainless steel studs from own fabrication. My guess cylinder studs are getting torqued way too high commonly for no good, just stretching threads and distortion. You have to see that heat growth adds extra strain to steel studs in alu engines too. Stainless steel is a little better here with higher coefficient. </p><p></p><p> Vic</p><p>[ATTACH=full]38709[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 130779, member: 1493"] Greg, I spent hours thinking about matters but I am quite confident to be safe. The case threads are standard imperial, 9/16 something dia. and the very strong 7075 inserts tapped M 10 x1,5 mm standard, same like on 1000 cc BMWs for decades. They had M 10 since prewar I think, but only 750cc max then. Yes, there is an extra load on Vincent studs from acting as frame parts but I´d think less than a ton load from this so no real factor. The 460 Horex single got only M 8 studs but is allright with it, even with easy machine stainless steel studs from own fabrication. My guess cylinder studs are getting torqued way too high commonly for no good, just stretching threads and distortion. You have to see that heat growth adds extra strain to steel studs in alu engines too. Stainless steel is a little better here with higher coefficient. Vic [ATTACH type="full"]38709[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Do Big Bore Cylinder Muffs Need Special Head Studs?
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