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Date: Mon, 05 Sep 2005 14:28:25 -0500
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Another great flying day = another day of troubleshooting
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<... hot plug has a long path and a cold plug has a short path ... >
I know what hot/cold plugs are.  Was asking could we use a hotter plug.  
Guess not.

<... with high energy ignition system you can use the very coldest plug 
available and still not foul it ...>
Are High Energy, CD, MSD pretty much the same thing?  Behave the same 
way regarding being foul resistant?

So if we all converted to MSD ignition would SAG go away? 
What are we waiting for? ... Jim S.

Lehanover@aol.com wrote:

> In a message dated 9/5/2005 11:42:13 AM Eastern Daylight Time, 
> canarder@frontiernet.net writes:
> <snip>
>  
> The advantage of the MSD is that at low RPM, the plug will be hit up 
> to 40 additional times in each cycle. So low tip temperatures at idle 
> are less likely to cause fouling. The MSD is a capaciter discharge 
> system. It applies 350 volts to the coil primary windings, and some 
> coils will fail in short order (probably those with internal resisters 
> to overheat). They provide a list of coils that work just fine with 
> that system.
>  
> In the past 10 years I have not seen a Mazda race car without a pair 
> of MSD ignition boxes.
>  
> Lynn E. Hanover
>