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1. 06:59 AM - Re: Adjusting rotor position on M9-35 mags (John Nafziger)
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| Subject: | Re: Adjusting rotor position on M9-35 mags |
Groups,
I wanted to share what Ive learned with these M9-35 mags. Please note
these differ from the M9F mags that are typically on the M14P, so the
timing procedure is slightly modified from what Dennis summarized in
the prior email to the Yak list. Many thanks to Dennis and George Coy
for the help! George shared an excellent write up on Russian magnetos.
If anyone would like a copy, please email me and Ill pass along to
save George the headache.
I summarized Georges emails below:
The M9-35 has mechanical advance mechanism in the magneto. The angle
stamped on the magneto cover is the amount of advance angle (usually 30
to 35 deg). This is the amount the rotor will advance when the shaft
rotates above a certain RPM (I believe it is 600 RPM).
The rotor moves according to speed. It must LAG the #4 point at idle
and will LEAD as it advances 35 deg. If you put the rotor at the # 4
pin at static then when it advances 35 degrees when running, it will
fire the # 6 plug! There are only 40 deg between each spark plug
electrode (360 deg / 9 = 40 deg).
I am not sure the proper angle, but suspect you need to split the
difference. More Lag on the idle would put the finger closer to the
previous cylinder.
As long as the right mag is not used for starting and is off during
start I do not see why it could not be set up with more lag at static
so that the finger could be closer to the pin at the 35 deg advance
point. Of course then someone could exchange mags without realizing the
implications.
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