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AGMC Tohatsu Time Machine


Testament

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a bunch of formulae from the web, under 'expansion chamber design according to blair' for a two stage chamber. probly the same shit that's in the software. the constants for diameters dont range very much but tuned length changes heaps with exhaust duration and temperature. it's all divided by RPM so more of those make for a shorter spanny

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yeh alot of his expansion chamber figures are guessamations and working backwards from dimensions he saw on early 70's yamaha gp bikes. dunno how his stuff compares to more modern techniques but they must work ok/easier for diy probably

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Yeah, I used jennings formulae really roughly worked to something between 1.5m and 2m for 4000 or 5000rpms. Which makes sense since tuned length for speed of sound in air is around 0.9m which would eqaute to the length from the piston to the expansion chamber. Remember mx motors etc do 3x this rpms!

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