The Murphy Builders Site

I've finally gotten to the point where I can fly my plane regularly now.
I
have an issue with the oil system for my gearbox. I made the mistake of
supplying oil to the gearbox from a pressurized source from the engine.
At
60-70 psi I am giving the gearbox too much volume, even through a 1/16
restriction. I lose a quart of oil in 30 minutes in flight out the
gearbox
vent. I temporarily rigged a catch can for this so I could keep flying.
I
should have taken oil from an unpressurized source (i.e., the oil pan). I
am going to switch to a dry sump for the gearbox this winter.

Despite that, my biggest problem continues to be radio noise. Can I
enlist
the help of you other auto conversion folks? Can you tell me about your
ignition and radio setup? What kind of spark plug wires are used? Are
they
shielded? I assume your ignition is electronic HEI of some sort. Mine
has
an electronic ignition module that sends a low voltage pulse to a standard
automotive coil which then sends the high voltage pulse through the
distributor to the spark plug. (Stock MSD stuff.) My radio is grounded
at
a grounding block that is attached to the firewall and the engine via a
large diameter grounding cable. My alternator is not the problem. I have
run the engine with the alternator belts detached and still have the radio
noise. I have filters on the radio power cables and the ignition module
power. Any ideas would be greatly appreciated.

Mike





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