The Murphy Builders Site

Friendly reminder. Time to change the subject line.

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
mdb1225@comcast.net
Sent: Monday, September 24, 2007 3:57 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Radio Noise

I am looking at a used Rebel with a Subaru engine and a Ross drive. The
owner described a problem with "sympathetic vibrations", when the engine is
running below 1600 RPM causing backlash problems in the Ross drive. Have you
encountered similar problem?

Thanks,
Mike

-------------- Original message --------------
From: "LeRoy Taylor" <leroytaylor@charter.net>

I have a Ross drive with very very little leakage. It is restricted on the

inlet side like yours . Could your outlet side be plugged to where it
forces the oil through the seals. ,or could your seals be bad. Leroy
----- Original Message -----
From: "Mike Kimball"
To: "Rebel Builder's List"
Sent: Monday, September 24, 2007 4:57 PM
Subject: [rebel-builders] Radio Noise

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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