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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Seals on inside of Comet-C Timing Side Cover
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<blockquote data-quote="greg brillus" data-source="post: 177333" data-attributes="member: 597"><p>Most all of the early liners/barrels have the oil holes too high, only the later liners with the machined slot seem to feed oil bellow the oil ring........The prewar engines I've done suffer the same issue.......had to block the original holes off and re drill them lower down the liner. I'm guessing this was a major contributor to oil usage in these engines verses the restrictor wires in the return feedbolts.......that may have seemed to be a cure on an engine with badly worn guides but not constant oil fed into the rings........this with the oil pumping action of the flywheels constantly churning the oil and throwing excess amounts up the bores.......the rings couldn't hope to overcome that.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 177333, member: 597"] Most all of the early liners/barrels have the oil holes too high, only the later liners with the machined slot seem to feed oil bellow the oil ring........The prewar engines I've done suffer the same issue.......had to block the original holes off and re drill them lower down the liner. I'm guessing this was a major contributor to oil usage in these engines verses the restrictor wires in the return feedbolts.......that may have seemed to be a cure on an engine with badly worn guides but not constant oil fed into the rings........this with the oil pumping action of the flywheels constantly churning the oil and throwing excess amounts up the bores.......the rings couldn't hope to overcome that. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Seals on inside of Comet-C Timing Side Cover
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