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-----Original Message-----
From: Rotary motors in aircraft on behalf of WRJJRS@aol.com
Sent: Tue 1/25/2005 12:13 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FW: Re: Plugs and Mags
Ed,
Do you know what type of plugs Tracy uses, el-cheapo or platinum? You
said that he runs mo-gas so I assume he doesn't have the lead-fouling
problem you and others have. So, I assume Tracy's plugs are actually
worn out after 100 hours? If that's the case, it seems that the
platinum, or iridium plugs might give longer life.
Mark S.
Mark, A comment bearing on all the "fine wire" plugs. If you use coils with dual leads,(two wires out), don't use them. Tracy is now suggesting the LS1 coils which are single output coils. Several of the same-time-fire systems use the dual lead coils. The problem is that one plug fires BACKWARD arcing from the side wire to the center electrode. The center electrode wasn't intended to be the receiving end of the arc.
When I worked for Kawasaki on bikes they found the platinum plugs started out great but failed SOONER due to the center electrode being eroded and mushroomed. Lead effects can't do anything but make this worse. Motorcycles have used the wasted spark on exhaust stroke forever to prevent the need for a high-tension distributor. The secondary of the coil "floats". It isn't grounded. Both plugs are needed to complete the circuit.
Bill Jepson
Bill,
Sorry for the delayed response, but this message got lost in the pile of stuff on oil pans and remote oil filters. Good point on the dual tower coils, I never would have thought about the electrodes getting mushroomed. Anyway, what I would like to know is, if you're running LS1 coils, will the platinum or iridium plugs perform any better than the el-cheapo plugs? Has anyone tried both types with LS1 coils? Mark S.
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