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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston Clearances
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<blockquote data-quote="Albervin" data-source="post: 104558" data-attributes="member: 586"><p>Well said David. The issue of air space between liner and barrel/muff can be dealt with by a heat conductive "filler" but I would not totally rely on that. I have used nikasil bores on two strokes with 0.0015 clearances but for a four stroke I would not dare. Likewise I would not entertain a clearance of 0.0035 in a Vincent; twin or single.. The fuel is really problematic and so also are carburettors. Unless you can check the air and idle jets you are playing with fire and $$$$$$$$$$$. What Vic is missing is the oil flow. An E-Type oil pump is like a turbo jet compared to a Vincent oil pump, and water cooled.. Heat is dissipated in an air cooled engine by "air" and oil flow. The example of the SR/XR Yamaha is probably more applicable. The Yamaha weighs a good deal less than a Vincent, has a five speed gearbox and has clean air in front of the cylinder. It is OHC design so the oiling is completely different. BMWs have cylinders in open air. Go less than 0.004" at your peril.</p></blockquote><p></p>
[QUOTE="Albervin, post: 104558, member: 586"] Well said David. The issue of air space between liner and barrel/muff can be dealt with by a heat conductive "filler" but I would not totally rely on that. I have used nikasil bores on two strokes with 0.0015 clearances but for a four stroke I would not dare. Likewise I would not entertain a clearance of 0.0035 in a Vincent; twin or single.. The fuel is really problematic and so also are carburettors. Unless you can check the air and idle jets you are playing with fire and $$$$$$$$$$$. What Vic is missing is the oil flow. An E-Type oil pump is like a turbo jet compared to a Vincent oil pump, and water cooled.. Heat is dissipated in an air cooled engine by "air" and oil flow. The example of the SR/XR Yamaha is probably more applicable. The Yamaha weighs a good deal less than a Vincent, has a five speed gearbox and has clean air in front of the cylinder. It is OHC design so the oiling is completely different. BMWs have cylinders in open air. Go less than 0.004" at your peril. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston Clearances
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