REFLECTOR: new electronic ign.

[Scott Derrick]

WHile there may be mags with a good spark, you won't find one on an
airplane.   THe spark is absolutly lousy.

I gap the plugs on my one slick mag at 18, I gap my plugs on my lightspeed
at 35.  Hmmm.. WHy?  Reason is the mags are so weak any larger gap will
just arc across the points in the mag instead of the plug.  The lightspeed
on the other hand has a very hot spark that can jum the 35 gap with ease.

I can run my engine on one mag and loose, minimum 25% power, closer to
35%, I can run on the lightspeed and loose at the most 10%, probably
closer to 5%.

WHen I do a mag check I drop 75 rpm when running on the mag, I drop less
than 10 rpm when shutting the mag off.

Mags suck in all respects except one, they don't need any external power.

Mags fail all the time and have very short lives. The TBF for a well
designd EI is longer than the life of the plane.

Scott

> Mags do not have a lousy spark. They need two spark plugs per cylinder
> because it is too big to combust properly with only one ignition point,
> especially a 540. And you need two ignition units because anything can
> and will eventually fail. Electronic units fail instantly instead of
> running rough like an old style mag.  bg
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Saturday, July 17, 2004 10:15 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: new electronic ign.
>
>> Try and remember: you do not have two mags because they give better
>> ignition that way - they give lousy ignition the day you install them,
>> and go downhill from there. You have two mags because one of them is
>> *certain* to fail. One electronic unit provides better ignition (saves
> a
>
> While I agree that mags are much more failure prone than an EI and that
> one of the reasons for two is redundency in case of failure.
>
> Mags have a lousy spark and you will not get full power with just one.
> two are required.  Even with EI's two plugs will provide a more complete
> burn and more power than one.
>
> Scott
>
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