Re: Mag timing with a timing light

Posted by John T on December 11, 2008 at 19:23:27 from (66.244.97.31):

In Reply to: Mag timing with a timing light posted by 37chief on December 11, 2008 at 17:54:14:

I time a mag (static start impulse timing) so she SNAPS and fires just at dead TDC. That allows it to start cuz if its too fast before TDC it can kick back yet if too late after its harder to start. You dont really need a timing light to set the static start impulse timing because you can hear it SNAP and set it so that happens right at TDC. Sure a timing light will flash then when she fires at that TDC but you cant have it cranking too fast or running to set the start timing cuz once running the mag will automatically be firing at its advance run time.

Then you can use a timing light to see where shes firing at once the impulse is disabled (around 250 RPM on Deeres) n shes sittin there running at idle or faster.

A Mag doesnt have a variable advance timing curve like a distributor (just has a start and run time ONLY), she starts at one time and then over 250 RPM or so the impulse stops working and she fires say at 20 to 30 BEFORE depending on the mag and drive cup and points gap and the lag angle setting and wear n tear.

John T

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