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Old 09-16-2007, 08:06 PM   #1
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Default OS P3 Glow Plug Problems

I'm running an OS EB Mods V-Spec .21 in my 8IGHT. I've got about 3/4 gallon through it. So far every race day, I've gone through a P3 (the plugs EB says to run in the engine) plug. And they're not burning up. The elements are breaking. Twice I've had them break in the middle of a main where the car will stall, then when it won't start again, we pull the plug out and the element is broken. Every other time, it's after the main, I go to put after run oil in and check the plug and it's broken. The engine runs great, but what's the deal? I'm still not really clear on the different plugs. Is a higher number hotter or colder? Would you run a colder plug in hot humid weather? etc... It's been really hot and humid around here lately (100+ and very humid) so I don't know if the P3 is too hot of a plug for that kind of weather or what. I was running O'Donnell 30% and I've started running Nitrotane 30% and it's done it with both fuels. I've got a bunch of Orion Turbo 6 plugs that I could use. I ran one in a qualifier and not having time to tune the needles, it ran like crap. Would that be a better plug? Is it a hotter or colder plug.

Sorry for the rookie questions. Still trying to wrap my head around tuning nitro engines.

Last edited by Jon Kerr; 09-16-2007 at 08:41 PM.
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Old 09-17-2007, 12:30 PM   #2
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.21's generlly eat more plugs then .12's. If the element is breaking, it's usually from pre-detonation or excessive compression. also, p3 sounds very hot for a 21. they usually use much colder plugs. try an os 8 and see if that helps........
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Old 09-17-2007, 02:14 PM   #3
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Jon,

The P3 is the hottest plug in the range. You might try a P4 or a P6 for hotter weather. Check the top of the piston and the head button, is there any pitting? Pre-detonation will kill plugs like you're describing. The plug wire will also be gray and pitted as well. Check those things first and then go from there. I have other things you can check but it's more involved. You can PM me if the first suggestions don't work out.

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Old 09-17-2007, 03:37 PM   #4
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Quote:
Originally Posted by Jon Kerr View Post
I'm running an OS EB Mods V-Spec .21 in my 8IGHT. I've got about 3/4 gallon through it. So far every race day, I've gone through a P3 (the plugs EB says to run in the engine) plug. And they're not burning up. The elements are breaking. Twice I've had them break in the middle of a main where the car will stall, then when it won't start again, we pull the plug out and the element is broken. Every other time, it's after the main, I go to put after run oil in and check the plug and it's broken. The engine runs great, but what's the deal? I'm still not really clear on the different plugs. Is a higher number hotter or colder? Would you run a colder plug in hot humid weather? etc... It's been really hot and humid around here lately (100+ and very humid) so I don't know if the P3 is too hot of a plug for that kind of weather or what. I was running O'Donnell 30% and I've started running Nitrotane 30% and it's done it with both fuels. I've got a bunch of Orion Turbo 6 plugs that I could use. I ran one in a qualifier and not having time to tune the needles, it ran like crap. Would that be a better plug? Is it a hotter or colder plug.

Sorry for the rookie questions. Still trying to wrap my head around tuning nitro engines.
Since you're running 30% nitro and using it in a .21 motor... You should really be using only a warm plug on cold days and a cold plug during the Summer months... Switch to a OS P8 and re-tune your motor... You should be fine after that... If the weather in your area is a bit cold, then drop in a OS P7... You should only need to run a hot plug if your running 16% nitro or lower. P3 and P6's are hot plugs and are used mostly in small block .12's...

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Old 09-18-2007, 05:46 PM   #5
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jon here is a chart and description of different plugs http://www.outlawrc.com/glowplugs.htm
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Old 09-18-2007, 08:16 PM   #6
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Thanks guys. One more question. When I go to a #8 and I'll need to re-tune, which way should I need to adjust. Leaner or fatter?
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Old 09-26-2007, 05:56 AM   #7
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your head shimms should add up to 0.6 mm for 30% even 0.7
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Old 09-26-2007, 08:17 PM   #8
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Jon,

You've got PM.

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Old 09-26-2007, 08:32 PM   #9
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Back at ya. Thanks.
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