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Old 07-14-2003, 06:37 PM   #1
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Default Glow plugs keep dying

I have a force.12 motor which is constantly killing glow plugs on me.
Ive tried os #3 and #5's. These plugs lasted less than 2 hours.
The os #8 lasted a little over 4 days.
I have the motor running to what I consider, well tuned. No bog on acceleration, smooth till powerband, plenty of smoke on the straights. And the motors not running hot :/
Is my glow stick (er charger) able to kill these ??
Im at a loss to why/what is causing this.

Thanks for any input you may have

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Old 07-14-2003, 06:44 PM   #2
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Yes, if you keep your glow ignitor on the glow plug too long it will lower the lifetime of the glow plug.
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Old 07-14-2003, 07:22 PM   #3
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I could be your glow igniter, or you just have to tune your mtoor again.

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Old 07-14-2003, 09:33 PM   #4
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Default Re: Glow plugs keep dying

Quote:
Originally posted by doff
I have the motor running to what I consider, well tuned. No bog on acceleration, smooth till powerband, plenty of smoke on the straights. And the motors not running hot :/
Is my glow stick (er charger) able to kill these ??
Im at a loss to why/what is causing this.
Sounds like your running too rich and fouling your plugs. Is the coil shiny & wet, or dull gray & dry?
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Old 07-14-2003, 10:03 PM   #5
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thx for the replies

Its a pull start motor, I have no starter box yet, so when the one way gets oiled up, well, you know the story..(its a pain) :P I do have a tendency to leave the glow stick on the plug while im pulling to try dry, or start. this can be from 10secs to a minute long.
Is that too long ? :/

The plug is clean and oily on removal. Is this a sign of too rich a setting ?? (but see below :/)
Im using 15% nitro, synthetic based.

The motor is, too what I consider, fairly well tuned, i have a home made idle screw in it, but works as factory.
It doesnt bog on full throtle from standing starts, wheel spins fine :P. It accelerates fine to top speed, and holds it fine, with smoke coming from the exauhst as normal.

I havent a temp gun/probe but a basic spit test leads it to be fine in my opinion.

Just at a loss still.. Any suggestions on plugs ? Higher/lower nitro maybe ? problems internally ?

/me shrugs

thx

doff
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Old 07-15-2003, 06:14 AM   #6
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Sounds like it may be a little too rich.
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Old 07-15-2003, 06:27 PM   #7
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What temp for Nova MT12 engine?? My engine also like to EAT up the glow plug. I think I run too rich. Now I need the temp and this could help me to save the plug. Thanks.

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Old 07-15-2003, 06:35 PM   #8
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temp usually between 220-250. I have an MR12 and i try to keep it below 250
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Old 07-17-2003, 12:36 AM   #9
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Check for head shims. and add a couple of .010 shims.
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Old 07-17-2003, 12:40 AM   #10
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I think i read somewhere which advises you not to run the car till you totally run out of fuel which burns out the plug. Not so sure if this is true but i'll keep that in mind....
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Old 07-17-2003, 01:04 AM   #11
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never had a problem with running the engine dry...
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Old 07-18-2003, 09:59 AM   #12
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I run my mt12 around 250 degrees usually. May sound lean but this is where it is in the powerband. Sounds like u are too rich. Try leaning ur high speed needle out an 1/8 of a turn.
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