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Crank build for racing engine
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<blockquote data-quote="Pushrod Twin" data-source="post: 179222" data-attributes="member: 340"><p>This is a timely thread for me, I have been tasked by a Section Member to carry out some machining work on a Comet engine to take a 92mm Terry Prince top end. </p><p>He has also handed me a pair of standard flywheels, conrod and two big end assemblies. The BE's are both 40x48, one with 1.003" shafts, one with 1.125" shafts, both with 7/8" threads. The 1.0" shaft BE falls into the flywheels so the 1 1/8" is the only choice. </p><p>The conrod will need the big end honing round, fortuitously, one of the big end bearing rings is over size, but the small end bore has a ridge indicating that it has had a loose bush. </p><p></p><p>Even if the flywheels and conrod were 100% within standard Vincent tolerances, are they capable of withstanding the extra power generated by a TP top end with MK II cam when being used for spirited road riding? </p><p></p><p>I would value the opinions of the learned here, please.</p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 179222, member: 340"] This is a timely thread for me, I have been tasked by a Section Member to carry out some machining work on a Comet engine to take a 92mm Terry Prince top end. He has also handed me a pair of standard flywheels, conrod and two big end assemblies. The BE's are both 40x48, one with 1.003" shafts, one with 1.125" shafts, both with 7/8" threads. The 1.0" shaft BE falls into the flywheels so the 1 1/8" is the only choice. The conrod will need the big end honing round, fortuitously, one of the big end bearing rings is over size, but the small end bore has a ridge indicating that it has had a loose bush. Even if the flywheels and conrod were 100% within standard Vincent tolerances, are they capable of withstanding the extra power generated by a TP top end with MK II cam when being used for spirited road riding? I would value the opinions of the learned here, please. [/QUOTE]
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Crank build for racing engine
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