Hi all.

I have been having a problem with an excessive mag drop on my 75hp
Revmaster with auto-spark plug conversion. I have the Bendix dual
mag fitted. When I check the mags at around 1500rpm there barely
seems to be a noticeable drop on the right mag about 50rpm or so.
But when check the left mag there seems to be a 300-400rpm drop. The
engine seems to run ok but definetely seems rougher when on the left
mag. When selected to both, the engine runs as normal on all plugs.
I have checked and replaced all plugs and they are nearly always a
nice golden brown colour. I have had the mag checked and timed and
the points checked and cleaned. I have checked the harness and all
is ok. I have now hit a dead end and don't know where to go from
here. Has anyone come across this before? My engine is new with only
8 hours of running on it.
Also does anybody have any photos I could have of Q2 Revmaster
baffling as the baffling that came with my aircraft is totally
inadequate. I have seen photos of other aircraft Revmaster baffling
installations but it would be really helpfullyif I could see some
pics of Q2 baffling.

Any help would be greatly appreciated.

Regards,
Simon Wilson
UK
G-BVYT
quickieq2uk@...

Pulling the leads isn't a great idea. It will zap you (I've done it on a car) and possibly damage the mag as the spark has no where to go so it jumps around the inside of distributor cap leaving carbon trails everywhere. Mag rebuild books specifically say don't fire the mag without a plug attached.

Could be P leads, mag filter (if he has one) or a bad mag (my bet).

Mike Q200

Paul Spackman wrote:

FYI - firing a mag without a path to ground (i.e. sparkplugs) can cause a
breakdown of the insulation within the secondary windings of the magneto's
coil.

These windings aren't much larger, in diameter, than human hair. If a
charge is built up within the mag, the energy has to go somewhere and if
there is no easy ground path damage can result.

Sam

_____

From: Q-LIST@... [mailto:Q-LIST@...] On Behalf Of
Mike Dwyer
Sent: Friday, January 06, 2006 4:28 PM
To: Q-LIST@...
Subject: Re: [Q-LIST] Re: Revmaster Mag drop.



Pulling the leads isn't a great idea. It will zap you (I've done it on
a car) and possibly damage the mag as the spark has no where to go so it
jumps around the inside of distributor cap leaving carbon trails
everywhere. Mag rebuild books specifically say don't fire the mag
without a plug attached.

Could be P leads, mag filter (if he has one) or a bad mag (my bet).

Mike Q200

Paul Spackman wrote:

If you are sure that the harness and the plugs are OK then, check the
mag switch(s) and the wiring and switches to the tach. Have you tried
pulling the leads to the plugs with the engine running one at a time
while on the left mag only? Watch the prop if you use this method.


Paul Spackman

--- In Q-LIST@..., "quickieq2uk" <quickieq2uk@y...> wrote:

Hi all.

I have been having a problem with an excessive mag drop on my 75hp
Revmaster with auto-spark plug conversion. I have the Bendix dual
mag fitted. When I check the mags at around 1500rpm there barely
seems to be a noticeable drop on the right mag about 50rpm or so.
But when check the left mag there seems to be a 300-400rpm drop.

(Snipped)

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