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Old 07-16-2006, 01:24 PM   #1
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Default Melting glow plug coils!

Today I was at the track running the engine rich at stock needle settings - 4.5 turns out - HSN, 3 turns out - LSN, Flush with carb body - MSN. Usually I do this for a few mintues to reset everything and flush out any dirt. Well after about four laps (smoke at full throttle, raw fuel spitting out at idle) I shut her down. After about 30 seconds I attempted restart the engine with no luck. Upon inspection the glow plug coil had melted - brand new! Then it did it again within three laps on another brand new plug!

After I burned two plugs out and none left, I packed up my things.

I have a Nova TN12 (based off RS12), Byrons Race 3000 (30%), and O.S. #8 plugs, 90-95 degrees out, engine is totally stock (no shims added). At the end of the last race I noticed the car was having problems.

Is it possible that the car is too rich? This isn't making any sense to me. Thanks in advance.

Last edited by performula; 07-16-2006 at 04:18 PM.
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Old 07-16-2006, 01:50 PM   #2
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Should I be using a colder plug?
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Old 07-16-2006, 02:51 PM   #3
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Hmmmmm, the same problem I had before.
Does your engine vibrate too much? Does the button head in the combustion chamber a little rough?
Check the piston, bearings, and excessive play on the connecting rod brass bushings.
Replace them if necessary. Or try to add 0.1mm shims to minimize detonation.
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Old 07-16-2006, 04:09 PM   #4
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I'm almost positive it is the 30% nitro and the OS #8 that do not match. Can anyone confirm this?
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Old 07-16-2006, 04:24 PM   #5
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Just one question... why use an OS #8 plug? Just use the Nova or RB ones... less fuzz and problems. Is normal or Turbo?
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Old 07-16-2006, 04:25 PM   #6
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Quote:
Originally Posted by Corse-R
Just one question... why use an OS #8 plug? Just use the Nova or RB ones... less fuzz and problems. Is normal or Turbo?
Normal/Standard. I'll be honest I am very disappointed with these. My Novas never gave me problems other than one. Where can I get them in the states?
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Old 07-16-2006, 04:36 PM   #7
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Just use a Nova 7Cold or RB #7. Pay attention to the Combustion chamber height. If you find some Sirio #7 they work really fine too (Yep... are available on standard 1/4 UNF thread size - Are the buggy ones).
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Old 07-21-2006, 04:22 PM   #8
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Can someone breakdown the RB Concepts plug number and heat ranges, thanks.
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Old 07-21-2006, 06:26 PM   #9
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Quote:
Originally Posted by performula
I'm almost positive it is the 30% nitro and the OS #8 that do not match. Can anyone confirm this?
I would try to use a shorter plug. OS #8 is a standard plug as your said.

You probably save couple bucks using OS #8, but it is just better to use NovaRossi plug....
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Old 07-22-2006, 01:18 AM   #10
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i blew every OS standard pug i ever had (A3 ,#8) (when i used a OS12TR) i found that they werent that good, i always ran the engine rich and i wasnt the only one having probs with them, i ended up selling the engine cheap and the other guy started using the R5 plug on 15% nitro
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Old 07-23-2006, 08:15 PM   #11
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The os plugs are shorter than novarossi and the #8 is too hot for 30 percent fuel.
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Old 07-23-2006, 08:35 PM   #12
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Can anyone break down the RB heat ranges/plug codes?
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Old 07-23-2006, 08:36 PM   #13
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Quote:
Originally Posted by latemodel13
The os plugs are shorter than novarossi and the #8 is too hot for 30 percent fuel.
Yeah, I went through $20 worth of plugs. You live and learn I guess.
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Old 07-23-2006, 09:15 PM   #14
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What's the difference between long and short plugs?
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Old 07-24-2006, 10:10 AM   #15
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Check your engine's spec. the shim that come with stock engine has a limitation. most engines are good up to 25% nitro without adding a 0.1mm shim. (0.1=5% nitro) 30% nitro creates lots of compression. your problem is shimming.
i am almost sure that once you find out the max nitro for the stock setting and adding the right shimms your problem will go away.
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