Re: Magneto timing Farmall M

Posted by Bob on July 25, 2007 at 08:59:35 from (69.178.229.154):

In Reply to: Magneto timing Farmall M posted by Farmall M 560 on July 25, 2007 at 08:25:14:

At cranking speed, the mag's impulse retards ("lags") the timing.

Once the engine speeds up a few hundres RPM's, the impulse "kicks out", and the mag jumps ahead to running timing all at once. When you use a timing light with the engine running, you will be seeing "running timing" (advanced). From that figure, you subtract the "lag angle", which will get you back to a timing, at cranking, of about TDC. Setting the impulse timing to earlier than TDC will break your cranking arm, or break the "nose cone" off of the starter.

That's why you would need to know the impulse's "lag angle, if using a timing light with the engine running, so as not to get the timing earlier than TDC at cranking.

Replies:

• Re: Magneto timing Farmall M Bob 09:13:27 07/25/07 (0)

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