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Nigel, you are an engineer and know about trigonometry. When I was bulding my T250 Suzuki engine. I had use of one of the first minicomputers in Victoria. I created a table which related port heights to degrees of crankshaft rotation. That calculation can be used to derive an optimum ignition curve, if you arbitraily decide the times over which combustion occurs in the motor. If you get it wrong, all you need to do is shift the whole curve while using a dyno

[QUOTE="acotrel, post: 640353, member: 4295"] Nigel, you are an engineer and know about trigonometry. When I was bulding my T250 Suzuki engine. I had use of one of the first minicomputers in Victoria. I created a table which related port heights to degrees of crankshaft rotation. That calculation can be used to derive an optimum ignition curve, if you arbitraily decide the times over which combustion occurs in the motor. If you get it wrong, all you need to do is shift the whole curve while using a dyno [/QUOTE]

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