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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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<blockquote data-quote="royrobertson" data-source="post: 99560" data-attributes="member: 2486"><p>When I was young and very new to Vincent engines I started racing the Norvin I had built at the Silverstone High Speed Trials having done many road miles over the previous three years. I had previously noticed one of liners tended to tended to rotate so just put in a small dowel to prevent the oil hole from being blocked. Silverstone in those days was always in June and a high-speed, lots of full throttle circuit. The heat generated caused it to nip up on the straight at one meeting but by the time I had slowed, it had freed up and I dropped the clutch and off I went again. I just increased the main jet size and finished the meeting. Subsequent investigation, by immersing the barrels in boiling water, showed both liners had virtually no interference when hot and then only in places. No wonder they seized in a half-hour High Speed Trial. The extra heat had nowhere to Go. Skimming the muffs and oversize liners with 6 thou interference was the cure. Why the original interference had disappeared is a mystery, they were not the die-cast ones. Maybe it just wasn't there in the first place.</p></blockquote><p></p>
[QUOTE="royrobertson, post: 99560, member: 2486"] When I was young and very new to Vincent engines I started racing the Norvin I had built at the Silverstone High Speed Trials having done many road miles over the previous three years. I had previously noticed one of liners tended to tended to rotate so just put in a small dowel to prevent the oil hole from being blocked. Silverstone in those days was always in June and a high-speed, lots of full throttle circuit. The heat generated caused it to nip up on the straight at one meeting but by the time I had slowed, it had freed up and I dropped the clutch and off I went again. I just increased the main jet size and finished the meeting. Subsequent investigation, by immersing the barrels in boiling water, showed both liners had virtually no interference when hot and then only in places. No wonder they seized in a half-hour High Speed Trial. The extra heat had nowhere to Go. Skimming the muffs and oversize liners with 6 thou interference was the cure. Why the original interference had disappeared is a mystery, they were not the die-cast ones. Maybe it just wasn't there in the first place. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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