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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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<blockquote data-quote="greg brillus" data-source="post: 99486" data-attributes="member: 597"><p>Sorry Guy's been away on a local bike rally this weekend........ Ok, the way I see it with ignitions is this...........They are either too basic, or too complicated. However, only very few are capable of driving a twin plug head successfully that will not only create power but be easy to start and not damage the engine as well. You need around 4 to 5 degrees of timing for easy starting and a good strong idle, with no more than 26 to 28 degrees full advance, and even then a fuel of around 91 octane may still cause detonation. The 600 Norvin I just finished ran very well on one plug, BTH mag set at 34 degrees, with a 36 mm Mikuni carb, and a factory spec Mk 2 cam. My understanding of a squish band is that they actually work better if the band tapers from the outside inward and if the angle is about 30 degrees angled upward on the piston crown and the outer area of the combustion chamber. This gives a much better power output than just a flat band that we have with these heads. My thoughts on the use of the oil feed to the rear.........As the crank and rod assembly rotate in a clockwise direction from the timing side, it makes sense that the oil flung from the bigend is aiming at the forward wall of the liner, this is not the thrust face which is at the rear. It is obvious that it must still get lubrication if the feed is blanked off, but i still maintain that the thrust face at the rear is where the lubrication needs to be.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 99486, member: 597"] Sorry Guy's been away on a local bike rally this weekend........ Ok, the way I see it with ignitions is this...........They are either too basic, or too complicated. However, only very few are capable of driving a twin plug head successfully that will not only create power but be easy to start and not damage the engine as well. You need around 4 to 5 degrees of timing for easy starting and a good strong idle, with no more than 26 to 28 degrees full advance, and even then a fuel of around 91 octane may still cause detonation. The 600 Norvin I just finished ran very well on one plug, BTH mag set at 34 degrees, with a 36 mm Mikuni carb, and a factory spec Mk 2 cam. My understanding of a squish band is that they actually work better if the band tapers from the outside inward and if the angle is about 30 degrees angled upward on the piston crown and the outer area of the combustion chamber. This gives a much better power output than just a flat band that we have with these heads. My thoughts on the use of the oil feed to the rear.........As the crank and rod assembly rotate in a clockwise direction from the timing side, it makes sense that the oil flung from the bigend is aiming at the forward wall of the liner, this is not the thrust face which is at the rear. It is obvious that it must still get lubrication if the feed is blanked off, but i still maintain that the thrust face at the rear is where the lubrication needs to be. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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