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  #11  
Old 06-13-2018, 07:56 AM
j-red j-red is offline
 
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I ran the Autolite 386's gapped around .030
Changed them about every 50 hours, but not because they were functioning poorly: just because they were cheap.
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  #12  
Old 06-13-2018, 06:01 PM
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G3i Ignition G3i Ignition is offline
 
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Location: Littleton, Colorado
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Default KV vs's Gap, 1 foot?

Jump a foot, really, maybe in a vacuum chamber? It takes 60K average to ionize 1.00" @ standard pressure & temperature. X12, do the math
Thomas


Quote:
Originally Posted by FasGlas View Post
Not uncommon in racing engines to run magnetos and auto plugs, I have many times.. But, the heat ranges are different, the application is different and the plug life is short. Aviation mags have far less output than auto racing mags. Racing mags can jump a much larger gap. I've seen them jump over a foot on the test stands. The smaller auto plugs would be more susceptible to lead fouling with an aviation mag, not so much with an EI. Not a lot of pros to the cons.
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  #13  
Old 06-13-2018, 06:22 PM
CDN CDN is offline
 
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Location: Calgary, AB
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I used the G3 ignitions instructions to modify one of my bendix s-1200 mags. The other ignition is a CPI from SDS. I run NGK BR8ES plugs on both ignitions, .018 gap on the ones for the mag and .032 on the ones fired by the EI. I swap the plugs out every 100 hours after I perform a compression check and cylinder borescope.

I now have over 200 trouble-free hours and I'm on my third set of plugs. I dont throw them out because they are worn, damaged or fouled. They're so cheap it just makes sense to replace with new after they are removed for the scheduled maintenance. The plugs fired by the mag look the same as the ones for the EI except for the gap.

Before this I ran a similar setup on an O-360 in my Glastar before going to dual pmags. I had successful service for over 400 hours.

BTW the G3 instructions are cheap insurance for getting the mod done correctly.
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  #14  
Old 06-13-2018, 06:26 PM
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FasGlas FasGlas is offline
 
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Location: Prescott, AZ
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Yup.. Believe it or not. I used to get Vertex mags beefed up at Don Zig Magnetos for race engines. After the mag was finished it's put on a test machine that clamps the mag and rotates the shaft. The 8 wires went to 8 spark gaps that had a pull handle on one set of gaps. They start the machine and pull the handle to test the output of the mag. The difference between a stock Vertex and a Don Zig Vertex was amazing. And yes, it would jump a foot gap right out in open air. Looked like a Jacobs ladder. Aviation mags..... Well, maybe an inch or two.
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  #15  
Old 06-13-2018, 08:35 PM
Gerald Loyd Gerald Loyd is offline
 
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Location: Dumas, Arkansas
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Hello Thomas

Thanks for sending the G3i module. I installed it this afternoon and got a good mag check. I didn't get to test fly it because of weather. I'll do it in the morning & call you.

Gerald
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  #16  
Old 06-13-2018, 10:01 PM
SHIPCHIEF SHIPCHIEF is offline
 
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I purchased the Bendix 'Old Style' ignition harness plate (has gland nuts holding the wires) from an eBay ad, it easily adapted to 8.5mm MSD spiral core wire & 90 degree boots.
It fired BR8ES plugs gaped to .016 just fine.
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  #17  
Old 06-14-2018, 05:05 AM
vic syracuse vic syracuse is offline
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Default High resistance

Some of the auto plugs, such as the BR8EIS have very high resistance, about 5K ohms. Isn't that hard on the mags, especially the coil?

The Autoilite 386's are not resistor plugs, and do not have high resisitance.

Vic
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  #18  
Old 06-14-2018, 06:16 AM
j-red j-red is offline
 
Join Date: Dec 2015
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And no plug adapters are needed for the auto lite 386 either.
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  #19  
Old 07-02-2018, 11:20 AM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by vic syracuse View Post
Some of the auto plugs, such as the BR8EIS have very high resistance, about 5K ohms. Isn't that hard on the mags, especially the coil?

The Autoilite 386's are not resistor plugs, and do not have high resisitance.

Vic
The 386 IS a resistor plug. In fact, after much research, I could not find anoher 18mm plug that was a resistor plug. Having tried non-resistor plugs with resistor caps, I can assure you that you would know if you had a non-resistor plug installed. I had a lot of noise, even with the resistor caps and went back to 386's. The 18mm plugs are sold mostly for vintage tractor applications and most don't have electrical systems and therefore the limited demand for 18mm resistor plugs. resistor plugs rob a bit of energy in exchange for reduced electrical interference.

Resistors are not hard on the mags. In fact, they reduce the spark energy a bit and make life easier on the mag. Plug gap dictates the power drawn from a coil and it is the large gaps that try to draw more power and damage the coil. If you run large gaps (>.018) on a mag, you are significantly increasing the likelihood of an early coil failure. The standard aviation plugs are also resistor plugs, they just use a lower resistance than auto plugs (1K vs 5K) due to the low energy output of the aviation mags.

Larry
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Last edited by lr172 : 07-02-2018 at 11:46 AM.
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