In message <3.0.1.32.19980615085140.006f4fe4@pop.fast.net>, Andy Kunz writes >>Were you using 1 coil per 2 cylinders in a waste-fire configuration >>or 2 coils to get extended dwell time ? >>If the former, why (in a racing application) ? > >In a standard 1-3-4-2 firing order, cylinders 1 & 4 are on Coil A and 3 & 2 >on Coil B. > >This gives more time for the magnetic field to build before being collapsed >through the plug, resulting in a hotter spark. Approaching 10K RPM it's >pretty necessary. I used to have a Suzuki 3 cylinder 2 stroke motor bike, that had 3 coils, and 3 sets of points. Obviously with a 2 stroke the coil needs to fire on every revolution of the engine, so even though 2 strokes rev a lot lower than 4 strokes (red line was 8000, as opposed to 12000 on similar size 4 strokes) three coils were needed to give good performance. -- Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelg@lpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | | | England | | \--------------------------------------------------------------/