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1. 04:25 AM - Re: Magnetos (racerjerry)
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Efraim, I hear your frustration.
Once upon a time, when an elusive ignition problem was plaguing me, I got pissed
and made a spark test fixture out of a section of aluminum angle material with
(6) 18mm tapped holes to which (4) old spare spark plugs were installed.
Magneto leads were temporarily removed from upper spark plugs and installed on
the test fixture spark plugs.
The aluminum angle & plugs were grounded to the engine and situated where I could
easily observe sparks with the business end of the plugs pointing directly
at me. Remember that you are only going to see a spark if it comes from a magneto
that has an impulse coupling.
As was said, you only need three things for combustion: FUEL / COMPRESSION / IGNITION.
On old cars, it was easy to check for as fuel problem with a squirt
of starting ether down the carb. I don't recommend that unless extreme frustration
sets in. Just prime the heck out of the carburetor and if you can smell
fuel, you can assume fuel supply is good.
ALSO, since this is an experimental airplane, you may be using a non-standard ignition
switch(s). "ON" in a normal switch usually means continuity across the
switch, which would ground out the magnetos, disabling them. I suggest, for
test purposes, temporarily remove the magneto grounding leads. BE CAREFUL -
ASSUME THE ENGINE WILL FIRE UP AT FULL POWER. Make sure the tail is SECURELY
tied down and that you can easily shut down the engine by turning off fuel supply.
CHOCKS are USELESS here.
Hope this helps.
Jerry King
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Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499829#499829
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