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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="timetraveller" data-source="post: 130813" data-attributes="member: 456"><p>You are correct Vic, The large crankpin does require each flywheel to be machined out about half way through the thickness of the flywheel. Originally these crankpins were developed for racing but once I had seen them I realised that they got round the problem of dirt centrifuging out of the oil and blocking the original annular groove. You will be aware that the original flywheels are quite soft and later experience has shown that if one wants a serious crankshaft for high power output then it is better to use hardened flywheels and to use Picador style push in crankpins. It might well be correct that a modern filter would prevent some of the original problem. Both filters and oils have improved a lot in the last few decades. I remember when if one worked on a car engine the inside of the rocker cover was covered in about 6 m of burnt on/condensed dirt and the sump would have sediment all over the bottom. This no longer seems to happen.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 130813, member: 456"] You are correct Vic, The large crankpin does require each flywheel to be machined out about half way through the thickness of the flywheel. Originally these crankpins were developed for racing but once I had seen them I realised that they got round the problem of dirt centrifuging out of the oil and blocking the original annular groove. You will be aware that the original flywheels are quite soft and later experience has shown that if one wants a serious crankshaft for high power output then it is better to use hardened flywheels and to use Picador style push in crankpins. It might well be correct that a modern filter would prevent some of the original problem. Both filters and oils have improved a lot in the last few decades. I remember when if one worked on a car engine the inside of the rocker cover was covered in about 6 m of burnt on/condensed dirt and the sump would have sediment all over the bottom. This no longer seems to happen. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
This is where some of that swarf ends up.
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