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Old Oct 16, 2012, 12:44 PM
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Get a methanol buzz .
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Joined Apr 2010
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Originally Posted by Brutus1967 View Post
OK? a glow plug cannot break?

Anyway, that is not how reliability assessments are made.

That would be: parts present combined with their respective mean faillure rate.

Personally, I think glowplugs in general show a significantly higher faillure rate than the combined chain of battery, sensor, electronics and sparkplug.

Brgds, Bert
I understand . Actually I was just breaking it down a bit . Still , there is very little that breaks down with a basic glow system . (Abuse aside) Even if you add on board glow (An extreme practice, far from mandatory) In the unlikely event of an onboard glow failure , the engine usually just purrs along without notice . In 50 years of flying , I have used on board glow with one plane . That plane is a loaner / trainer Kadet Senior . The on board glow is a convenience/ saftey addition to eliminate the need for a glow plug driver for starting . The engine idles and runs perfectly without the glow addition .
In the air , the main link is a simple glow plug . Many ,if not most glow plug failures are discovered and fixed on the ground .

The typical CDI has a myriad of components that can fail , any one of them can stop the engine at that point . Spark plugs foul , just as glow plugs fail . Hall effect sensors can come loose/fail , heavy on board batteries can fail , shielded plug wires can fail , CDI boxes etc . Shielding inadequacies can cause radio interference as well .

Parts that are not there cannot break still holds true .

Glow may have some drawbacks but the reliability and simplicity factor is pretty high with glow systems . I have seen very ...VERY few problems with glow systems . That won't keep me using CDI ..just sayin !

I whole heartedly doubt the potential glow failures in the air exceed the rate for spark ignition systems .

Diesel anyone ?
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Last edited by Gary Cee; Oct 16, 2012 at 12:58 PM.
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