jeffrey_davidson(at)earth
Guest
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 Posted: Mon Feb 26, 2007 2:11 pm Post subject: Shielded wires with modern ignition systems |
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The following posting was made to the AeroElectric list, but I thought it was appropriate here on the Jabiru Engine list as well. Jeff Davidson
"Time: 07:21:17 AM PST US
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: AeroElectric-List: Re: Shielded wires with modern ignition systems
. . .
At 10:52 PM 2/24/2007 -0800, you wrote:
| Quote: |
The Jabiru mags are not "electronic ignition" as commonly classified.
they
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| Quote: | do have a transistor switch inside.
Although shielding the P lead is not necessary, best practice is to run in
shielded lead, ground the shield at mag end to a spare thread hole (on the
alternator statorplate will do). At the mag switch end, the shield is
connected to the gnd terminal of the switch, but not connected to the
airframe here.
during running, there are over 200v of spikes on these lines. Refer to the
files section on Yahoo Jabiru/engines group, "radio noise" , look
for
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Excellent data sir! Thank you. I'm disappointed to hear about
it though . . . you would think that a company so obviously
dedicated to the use of modern machining and manufacturing
techniques would go a step further with their ignition system.
Having said that, I'll have to acknowledge that their decisions
may well have been based on a considered trade off between
cost and performance . . . and using shielded ignition control
leads has been a standard practice in aviation since the first
radio went into an airplane perhaps 95 years ago!
Okay, based on expanded knowledge offered by our brother Ralph,
we know that optimal wiring for the engine is POORLY explained on
page 10 of the Jabiru 3300 installation manual. Ralph
correctly cites the need for shielded wire and I concur
with the techniques he suggested above.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
---------------------------------------- "
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