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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="timetraveller" data-source="post: 109552" data-attributes="member: 456"><p>Just how different Tim? The reason that I ask is that many years ago one of my chums bought a new exhaust system for his twin and it would not fit. Being new to Vincents he assumed that it was his problem so he asked me to help. I could not fit it either so we put his engine/gearbox unit in the car and took it to the manufacturer. He could not fit it either and told us it must be a 'build up of manufacturing tolerances'. So we slackened off the cylinder head nuts, the push rod tubes and anything else which might be stopping any potential movement and tried again by moving everything around as far as it would go. Total movement on heads etc was thous. The cylinder holding down studs act as locating dowels and even with the heads loose there is very little potential movement. Of course all Vincents are different and it is difficult to measure the respective positions of things like exhaust ports etc but when things do not fit by one quarter to one half an inch then I doubt that is manufacturing tolerances. Remember that Vincent test riders had their own sets of pipes to be used when testing out new bikes. That would not have worked had there been the kind of mismatch which we see sometimes.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 109552, member: 456"] Just how different Tim? The reason that I ask is that many years ago one of my chums bought a new exhaust system for his twin and it would not fit. Being new to Vincents he assumed that it was his problem so he asked me to help. I could not fit it either so we put his engine/gearbox unit in the car and took it to the manufacturer. He could not fit it either and told us it must be a 'build up of manufacturing tolerances'. So we slackened off the cylinder head nuts, the push rod tubes and anything else which might be stopping any potential movement and tried again by moving everything around as far as it would go. Total movement on heads etc was thous. The cylinder holding down studs act as locating dowels and even with the heads loose there is very little potential movement. Of course all Vincents are different and it is difficult to measure the respective positions of things like exhaust ports etc but when things do not fit by one quarter to one half an inch then I doubt that is manufacturing tolerances. Remember that Vincent test riders had their own sets of pipes to be used when testing out new bikes. That would not have worked had there been the kind of mismatch which we see sometimes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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