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Old 10-03-2005, 06:28 PM   #11
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Re: Plug failure

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Originally Posted by Wayne MIller

I have heard that if you are using 1.5 volts (standard drycell) on your glow plug (MiMh and NiCd are 1.25 volts), and leave the glow starter connected while tuning, or leave the glow starter connected on the plug for a long period of time after starting, you can have premature plug failures.

Another cause can be an engine that is not fully broken in or the lining of the cylinder starting to shed, this causes bits of metal get into the plug and this will also cause premature failures.

In both of the above cases, the engine starts, runs well, but when turned off, will not start again.

I don't know where I got the above from, but I hope they will help isolate the problem.


Wayne Miller
Leaving the glow on while the engine is running is not normally a problem UNLESS you rev it up and leave it running at hi throttle with the glow attached. That'll burn the plug out for sure. I speak from experience here . A quick "up and down" while connected is not usually harmful .

I still say it is because he ran it too lean in the air at full throttle.
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Old 10-03-2005, 08:37 PM   #12
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Could the fuel feed (fuel tank height?) bee the problem then? Then maybe it is lean when in the air.
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Old 10-03-2005, 09:12 PM   #13
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There is only 2 things that will cause a glow plug to prematurely fail. The 1st is running the engine too lean which causes the engine to overheat and the glow plug coil melts. The 2nd is if the engine is producing metal that impacts the coil of the glow plug.

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Old 10-03-2005, 09:48 PM   #14
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Burning out glow plugs

Mike, I'm going to add No.3!
Armorall in the fuel to prevent foaming will burn plugs very quickly if there's any more than a couple of drops per gallon.
Long shot I know, but better than overlooking it as a possibility.
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Old 10-03-2005, 10:22 PM   #15
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He did say the engine is new so the metal impacting could be the main cause.

How was this engine broken in?
It wasn't a crash it was deconstruction for improving
maac 73408

Alan Brace
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Old 10-03-2005, 11:49 PM   #16
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Actually Mike is correct and he should know.
But also, switch to a 10 x 7 prop so you are not loading the engine so much as this will HELP get rid of some of your excess overheating.
Don't know about Xtra pooper dooper fuel. Would also try a better known name brand.
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Old 10-04-2005, 04:59 AM   #17
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According to the manufacture the engine was broken in, but a friend of mine who has been flying for many years broken the engine too. He checked the exhaust for medal. he said its ok. I don't all the things he did to run it in, but I know he ran the engine on the rich side.
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Old 10-04-2005, 05:12 AM   #18
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I had this very same thing happen to me personally, brought it to the airfield and had Dic, John and Henry look and play with no avail. same results everytime.
Turns out I had left my fuel in the car for weeks at a time, too lazy to unload everything out and in the cool shaded storage.
The fuel had in fact broken down and could not give me 1/2 throttle, had to fiddle with the high speed to make it do anything past 1/2 throttle and burned plugs.
I replaced it with brand new fuel, and VOILA!!!

Moral: Make sure you try another brand of fuel, Not just one source.
and Never leave your fuel to the UV rays of the sun, in your car...

Hope this also will help you

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Old 10-04-2005, 09:34 AM   #19
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Running lean will damage a plug very quick but if the engine has had the head off check to see if the shim is still in place. If not check the deck height from the top of the piston to the bottom of the head. Measure both on the outside and check to see if you have approx. .015" clearance. Add a shim if needed to get there. Running lean or being over compressed is the main causes of losing plugs with a (good) engine. Fuel quality will give most of your problems while running, poor idle and transisistion to the top end. The nitro content is not the culprit as most people think as you can run with reliability from FAI 0% up to about 25%. Keep your fuel jug sealed as much as possible in a place where the temp does not change a lot. In a humid climate it is worse as the alcohol will absorb the moisture and render it basically useless. The trunk of your car is okay for travelling but take it out after. How hot does it get inside at noon and how cool at night. Use fresh fuel when trouble shooting problems.
John Davidson
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Old 10-04-2005, 10:43 AM   #20
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Agree that the nitro content didn't cause the problem. Just said that it was a waste of $$ using it in that engine.
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