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cpayne(at)joimail.com
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 Posted: Sat May 23, 2009 3:41 am Post subject: Spark Plug gap |
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Confession is sometimes good for the soul...as Mark steps up and says:
| Quote: | ANYWAY ~ Funny thing. The high speed vibration went away too. Mag checks
during all of this were always good. No indication of plug problems at all.
Upon inspection, found that the plug gap was set too wide ... My fault for
not double checking the A&P that was helping me put in the kit way back
when. The plugs were at .032 or so. Dennis recommends .025 I have talked
to other folks who claim .018 is about right, and that wider than .018 can
cause "starting problems". I have mine now gapped at .025 per Dennis's
recommendation and everything is working perfectly, so I will avoid .018,
but it is worth keeping in the back of your head.
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No news to those of us believers in the auto plug setup. However, more work could be done in this area. These magnetos have a lot of "energy" but not the kind of voltage that could be an added benefit when using automotive plugs. Then the plug gap could be increased a bit. One way to do this is add-on devices that step up the voltage and reshape the "spike", but still revert to standard operation if they fail.
What i am describing is a kind of ignition system that existed during the early days of electronic ignitions, but improves on it by providing multiple pulses, tuned to the engine condition.
As of yet, I don't have the motivation to develop a design but I like the idea of retaining the original mag and enhancing it's operation.
Any takers?
Craig Payne
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yakplt(at)yahoo.com
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| Posted: Sun May 24, 2009 4:10 pm Post subject: Spark Plug gap |
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Craig, you are talking about an MSD-6 ignition system whether you know it or not. 
Read about it here: http://www.msdignition.com/product.aspx?id=5811
There is no question that it could be adapted to drive the coil in a mag... if the company could be led to believe there was a profit in it. I use this device on my big block 68 Camaro and it is the cat's meow. Racing engines with high overlap camshafts are prone to plug fouling at idle, exactly the same as our M-14's. This system prevents that and also prevents spark blowout at high RPM with a big supercharger.
Interesting idea to adapt the concept to an airplane engine.
Mark Bitterlich
From: Cpayne <cpayne(at)joimail.com>
To: yak-list <yak-list(at)matronics.com>
Sent: Saturday, May 23, 2009 7:37:37 AM
Subject: Yak-List: Spark Plug gap
--> Yak-List message posted by: Cpayne <cpayne(at)joimail.com (cpayne(at)joimail.com)>
Confession is sometimes good for the soul...as Mark steps up and says:
| Quote: | ANYWAY ~ Funny thing. The high speed vibration went away too. Mag checks
during all of this were always good. No indication of plug problems at all.
Upon inspection, found that the plug gap was set too wide ... My fault for
not double checking the A&P that was helping me put in the kit way back
when. The plugs were at .032 or so. Dennis recommends .025 I have talked
to other folks who claim .018 is about right, and that wider than .018 can
cause "starting problems". I have mine now gapped at .025 per Dennis's
recommendation and everything is working perfectly, so I will avoid .018,
but it is worth keeping in the back of your head.
|
No news to those of us believers in the auto plug setup. However, more work could be done in this area. These magnetos have a lot of "energy" but not the kind of voltage that could be an added benefit when using automotive plugs. Then the plug gap could be increased a bit. One way to do this is add-on devices that step up the voltage and reshape the "spike", but still revert to standard operation if they fail.
What i am describing is a kind of ignition system that existed during the early days of electronic ignitions, but improves on it by providing multiple pulses, tuned to the engine condition.
As of yet, I don't have the motivation to develop a design but I like the idea of retaining the original mag and enha========================
[quote][b]
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