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Old 06-06-2021, 12:02 PM   #1
Ron McIntyre
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Default Magneto drive

Anyone have info on mag drives used on Model A, B, engines?
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Old 06-06-2021, 01:28 PM   #2
nkaminar
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Default Re: Magneto drive

Gad, I haven't seen those in years. As I remember they mounted in place of the distributor.
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Old 06-06-2021, 01:34 PM   #3
Pete
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Default Re: Magneto drive

Some were side drive. Drove off of the cam gear. Wico mags were popular for these.
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Old 06-06-2021, 05:38 PM   #4
Jim Brierley
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Default Re: Magneto drive

I use a drive that Pete describes on my Bonneville engine. I removed the impulse but it starts easily with the starter. I don't like the top-drive mags because of the load they put on the small dist. drive gear.
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Old 06-06-2021, 06:20 PM   #5
Kinner
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Default Re: Magneto drive

Look at secretsofspeed.com
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Old 06-06-2021, 09:04 PM   #6
larrys40
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I have a wico magnet model a distributor or two. Would probably sell one or both for right price.
Larry Shepard
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Old 06-07-2021, 06:54 PM   #7
rotorwrench
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Default Re: Magneto drive

Magnetos are mostly fixed timing since the whole body has to be rotated to change it at all and that could be very problematic for mounting. The housing has to be solid due to the torque it takes to pull the shaft through e-gap. The impulse coupling is only for a retarded spark during start phase. They are basically made for all out throttle usage. Kick back on starting with no impulse coupling may not be a problem with a lower compression engine but it could be for a high compression engine. I've replaced a few busted starters on aircraft engines when the spark retard wasn't working correctly.
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Old 06-08-2021, 08:58 AM   #8
nkaminar
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Default Re: Magneto drive

The impulse starting mechanism also spins the magneto quick enough to get a spark when starting with a hand crank or starter. It winds up a spring and then lets the magneto loose when TDC is reached. When the engine is running a centrifugal device locks out the impulse mechanism.

I see all the magnetos mounted on the high performance engines at Secrets of Speed site mounted on the side and driven by the cam gear.
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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