Re: A/C - U Mag. in reply to Troy W, 05-31-2002 05:57:59
As you have just discovered for yourself, low compression-low RPM engines are not very fussy about ignition timing. The range that they will make maximum power is pretty broad compared to their more modern high compression and RPM counterparts. If you go too far enough either way though, you will start losing quickly. Basically, anywhere the exhaust note sounds smooth to your ear and the motor isn't laboring you can clamp it down and it will make very close to the same power on the dyno as when set to "spec" with a light. Just make sure the impulse doesn't snap before TDC or you will have a crank kicker on your hands. I set mine to the spec with a light only because I feel better about doing it that way. I have spent some time playing with these things on a dyno and I have yet to see an old tractor that had a magic timing setting for more torque or HP on the dyno, just a range where they seem to be happy. I have heard plenty of stories though from people with magic ears that could coax more HP out of a tractor by throwing the light away and timing her by ear, just never seen it for myself.
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