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Old 08-31-2007, 06:35 PM   #1
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Default xtm 18 glow plug issue.

Well i have finished breaking in the engine! broke it in nice and slow with small wips of the throttle. Lots of blue smoke so i know i wasnt running to hot. I am using the a3 glow plugs backyard basher nitro and after about tank to 2 tanks they burn out. I have run about 6 tanks through now. today i redid all the settings as the manual states. it was running just fine i was just doing some street racing at fairly high speeds against a buddy of mine 1/2 tank through boom another one goes.... I live in arizona the temp was about 105-100 while i was running. Any ideas on what may be going wrong or what i can setup to make this stop happening!

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Joe
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Old 09-01-2007, 06:46 PM   #2
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If the temperature is really warm you might try using a colder plug. Try using the SH#5 plug or maybe even a McCoy MC9. For some reason the OS plugs don't seem to last long in the XTM 18 engine.

Also, what fuel are you using? That could be a big issue. In the XTM 18, try using a fuel between 20 and 30% nitro and about 10-12% oil. More oil and you might have problems with the plug burning out as you need to lean the engine out further to burn the excess oil out.
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Old 09-04-2007, 03:36 PM   #3
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Well is it possible that the fuel mixture is wrong to much air to fuel ration? It is about 110 here now. The fuel does cool off the plug correct? maybe if i just go with more fuel it wont happen but not positive how to correct that i think its the big screw on the carb. please let me know if anyone else has had this problem.

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joe
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Old 09-04-2007, 10:31 PM   #4
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try a os #8. i ran these in my xtm .18 and would change them every gal or so. they still worked but back then i had money to burn so i would just change them for the heck of it.
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Old 09-05-2007, 12:42 AM   #5
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plugs blow from pressure,pressure from heat,heat from to lean to early
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Old 09-05-2007, 08:41 PM   #6
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So i didnt break in my engine fully?
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Old 09-05-2007, 09:54 PM   #7
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Default xtm

i had a xtm xcellerator with a .18 in it. i did a different break-in than normal. I set it on two sets of bricks and idled a tank through it and then when on with the break in.. During the break in i went thru 3 plugs until break in was over. After break in was over i continued to foul plugs and i wasn't running too cold or too hot.. I live in pa. and it was about 90 out with low humidity.. I changed my plug too a Mccoy Mc9 and changed my fuel from backyard basher 20% to Trinity Monster Horsepower 20% and i haven't had to change a plug in about 6 months... If that helps at all..
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