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MikeDunlop
Joined: 02 Jan 2012
Posts: 15
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 Posted: Wed Jun 27, 2012 5:47 am Post subject: Bendix Magneto Wiring |
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Having searched the forum I have found the following:
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Is there is any significant degradation in starting
performance when only one mag is hot?
You betcha . . . most engines come with only one impulse coupled mag.
Unless both mags are impulse coupled, you need to add a jumper between
the right mag's p-lead terminal and a nearby switched ground terminal
on the key-type magneto switch. This has the effect of grounding out
the right mag while cranking. It also has the effect of letting the
right mag become "hot" with the engine still moving after an aborted
cranking attempt - been known to break starter castings.
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Question is:
My Long-EZ is being fitted with a O-320 B3B that has two impulse couplings! Does this mean that the jumper between the right mag's p-lead terminal and a nearby switched ground terminal on the key-type magneto switch (with Start position - Gerdes A510-2) IS NOT REQUIRED?
This is all described in article at http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf
I would like to clarify this now because looking at the engine logs, it shows that the previous owner had replaced the woodruff key in the starter motor 3 times within 130 hours! This sounds as if there is a problem with kicking back on startup.
BTW the engine has now been zero timed and the mags will now be overhauled.
MikeD (U.K.)
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Neal.George(at)hurlburt.a
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| Posted: Wed Jun 27, 2012 6:05 am Post subject: Bendix Magneto Wiring |
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Mike -
If both mags are fitted with impulse couplings, and both function correctly,
you may remove the jumper.
neal
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