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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Oil Loss after 100mile run
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<blockquote data-quote="Nigel Spaxman" data-source="post: 127444" data-attributes="member: 2907"><p>Not many people believe me about this, but having the breather timed at around bottom dead center is not optimal. If it closes around BDC it is closing right when the pressure in the crankcase is at it's very highest, which is exactly when it should still be open. Of coarse the pressure does start to go down as the piston starts to rise but it is still at a higher pressure than when the valve would have been opened. It should open and close later than the standard timing. It is better if the valve opens about the same number of degrees before BDC and it closes after BDC.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 127444, member: 2907"] Not many people believe me about this, but having the breather timed at around bottom dead center is not optimal. If it closes around BDC it is closing right when the pressure in the crankcase is at it's very highest, which is exactly when it should still be open. Of coarse the pressure does start to go down as the piston starts to rise but it is still at a higher pressure than when the valve would have been opened. It should open and close later than the standard timing. It is better if the valve opens about the same number of degrees before BDC and it closes after BDC. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Oil Loss after 100mile run
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