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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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<blockquote data-quote="davidd" data-source="post: 91153" data-attributes="member: 1177"><p>It is very difficult to adjust the timing for best power without a dyno. Even with a dyno, it may require hours of runs. I got to 19 degrees before I had run out of slot on the BTH and with the other adjustments I was at the end of a full day. I was still gaining power as I got to 19. </p><p></p><p>The more advanced the ignition, the less compression you are utilizing as max compression happens at TDC. Effectively, your ignition is sparking and slowing down the piston as it is trying to compress the charge. This bang as the piston is rising can be very hard on the big end.</p><p></p><p>It is probably best to measure this gain in reliability rather than power. But, the twin plugs with their retarded firing is quite efficient and not prone to detonation. That seems to be what the tuners want.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 91153, member: 1177"] It is very difficult to adjust the timing for best power without a dyno. Even with a dyno, it may require hours of runs. I got to 19 degrees before I had run out of slot on the BTH and with the other adjustments I was at the end of a full day. I was still gaining power as I got to 19. The more advanced the ignition, the less compression you are utilizing as max compression happens at TDC. Effectively, your ignition is sparking and slowing down the piston as it is trying to compress the charge. This bang as the piston is rising can be very hard on the big end. It is probably best to measure this gain in reliability rather than power. But, the twin plugs with their retarded firing is quite efficient and not prone to detonation. That seems to be what the tuners want. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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