Today's Message Index:
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1. 08:08 AM - Re: Adjusting rotor position on M9-35 mags (Darin Bishop)
2. 12:33 PM - Re: Adjusting rotor position on M9-35 mags (George Coy)
Message 1
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| Subject: | Re: Adjusting rotor position on M9-35 mags |
" Please email me directly as I only get the digest." Doesn't this exclude
everyone else from the benefit of being on the list?
If anyone has an answer, which I wish I did, could you please also post it
to the list? I'm curious what the solution to his problem is.
Thanks,
Darin Bishop
www.2wings.com
Message 2
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| Subject: | Adjusting rotor position on M9-35 mags |
No.
The rotor moves according to speed. It must be 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).
Arc tracking and other carbonization inside the rotor cap is usually
caused by other factors. Things like bad coil/capacitor. Moisture in the cap
dirt in the cap etc.
George
-----Original Message-----
From: John Nafziger [mailto:jsnafziger@yahoo.com]
Sent: Thursday, March 15, 2007 9:37 AM
Subject: RE: M14PEngines-List: Adjusting rotor position on M9-35 mags
George,
So I'm correct that the rotor must be adjusted so it points to the mark on
the mag signaling the #4 plug. The fact that it doesn't, has nothing to do
with the mechanical advance (stamped 36 degs) and was an error in the
initial setup.
Yes, I make sure the slick start is only on during start, that is if I can
get it started! Below 50 degs F, it will not start.
Thanks for you help,
John
--- George Coy <george@gesoco.com> wrote:
> John,
> There is a mechanical advance mechanism in the magneto. The angle
> stamped op 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)..
> It is important that the SLICK start ONLY be engaged while starting
> and must be OFF after the engine is running.
> George
>
> -----Original Message-----
> From: owner-m14pengines-list-server@matronics.com
> [mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of John
> Nafziger
> Sent: Wednesday, March 14, 2007 8:00 PM
> To: M14PEngines-List@matronics.com
> Subject: M14PEngines-List: Adjusting rotor position on M9-35 mags
>
> --> <jsnafziger@yahoo.com>
>
> I've been experiencing difficult starting. I checked the timing on
> the mags and the points open correctly set at -5 deg ATDC (these are
> M9-35 mags with
> 36 deg built in timing).
>
> I noted that the left cap had arcing and a lot of carbon. A problem
> that I see is that when the mag is timed to fire the #4 plug points
> opening, the rotor is still 10 degs BEFORE the #4 wire position in the
> cap (I'm guessing this explains the arcing). The right mag is
> correctly positioned so the points open AND the rotor points to the #4
> plug. Note this is the single finger rotor with the slick start
> energizing the P-lead, not the booster coil and dual finger rotor
> setup.
>
> Assuming the above is not correct, how do you adjust the rotor postion
> on these mags? It seems that I need to KEEP the cam that the points
> ride on in the same spot, but shift the rotor. I noted an adjustment
> on the lower "bar" that inserts into the rubber drive block, but I
> think that will adjust both the cam and the rotor position.
>
> Please email me directly as I only get the digest.
>
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of Darin
Bishop
Sent: Thursday, March 15, 2007 11:06 AM
Subject: Re: M14PEngines-List: Adjusting rotor position on M9-35 mags
--> <db2005@2wings.com>
" Please email me directly as I only get the digest." Doesn't this exclude
everyone else from the benefit of being on the list?
If anyone has an answer, which I wish I did, could you please also post it
to the list? I'm curious what the solution to his problem is.
Thanks,
Darin Bishop
www.2wings.com
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