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Date: Wed, 28 Dec 2005 01:17:58 -0500
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: Where has all the power gone?

Dan,

Although I have not been able to find even one A&P in the whole wide  
world who nows this fact, the fact is still true. The fact is that  
Iridium plugs are supposed to be set at .024".

How do I know this? I bought a Champion spark plug gapping tool from  
Aircraft Spruce. The tool has 2 gap settings. One setting is labeled  
"Large" and sets the gap at .016". The other setting is labeled  
"Small" and sets the gap at .024" (maybe .022", I forget right now).  
The real question is: What does "Large" and "Small" mean. Someone at  
Champion must know. The Champion reps at SunNFun didn't know. I  
believe that "Large" means Platinum and "Small" means Iridium. If  
anyone knows for sure, please tell the rest of us.

I am the only one who is gapping my Iridium plugs to the correct gap  
according to Champion. I am therefore not pushing the envelope.

> From: "Dan Schaefer" <dfs155@adelphia.net>
> .
> .
> Increasing the plug gaps too much can force the magneto output  
> voltage (the so called "spark voltage") to find another path to  
> ground.
> .
> .
> One might be able to use a larger gap than specified when the  
> ignition system is new but unless you know what your margins really  
> are, you're not doing yourself much of a favor by pushing this  
> particular envelope.
> .
> .
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan