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Old 08-12-2006, 11:24 PM   #1
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The crazy world of glow plugs

I have a question, I just purchased a Sportwerks Mayhem Pro used from a local racer. It has an OS RG .21 motor and the guy I bought it from said he uses OS #8 glow plugs. It has only the plug thats in it right now. My local shop doesnt carry OS #8 plugs. Is there any other plugs out there that would work on this setup? Also, a uiversal standardized glow plug numbering systems needs to be created, cause I dont know if I am alone, but the current system is very confusing... Thanks for any help!
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Old 08-12-2006, 11:31 PM   #2
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If I were you, I'd stick with the OS8...OS glowplugs are really great. I started using them in evey motor I have and they seem to last better. I don't think I've ever actually had one of them go out for that matter. I can't say the same for McCoy, O'Donnell, NR or RB plugs.

There are plenty of places to get them cheap online. Tower has them and so do a few of the places that advertise on here.
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Old 08-13-2006, 01:28 AM   #3
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Thanks I will have to check on it! But, it sure would be handy if there was a standard numbering system! Just me dreaming out loud I guess...
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Old 08-13-2006, 09:09 AM   #4
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well, you can't use anything but OS plugs in that engine. OS engines use a different head that requires a short glow plug. The only plugs you can use are OS #8, A3, or A5. Personally, stay away from the A3, they are too hot for a 21 application. Even the #8 are on the warm side, but they do work really well. The A5 is the coldest in the os range.

So, use either #8 or A5 glow plugs.
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Old 08-13-2006, 11:16 AM   #5
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O.S. Power:

You are actually a bit wrong. The OS R5 is their coldest surface racing plug.
I run a Vspec and a RG engines with 30% fuel. In my Vspec the P3 turbo plug is the only plug to use unless its over 100+* outside then you can try a P8 but the P3 is probably better.

As to the RG I use a A3 (medium hot) almost exclusively. It is almost the same as the A5 but is OS's sport plug and is cheaper in cost. The #8 plug is OS's hot standard plug. RG engines love this plug (A3) and they last a long time with proper tuning.

And yes, use only OS plugs in OS engines as the thread length is shorter than the other brands. If you cannot get OS plugs you can always use an extra copper washer on the standard length plug. Its not perfect but will work on giving you the close to proper clearance for the engine.

I have found that the McCoy #59 will work the best in a RG with the extra washer if you can't use a OS plug.

enjoy....
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Old 08-13-2006, 03:17 PM   #6
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mc8
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Old 08-13-2006, 05:34 PM   #7
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Quote:
You are actually a bit wrong. The OS R5 is their coldest surface racing plug.
I knew someone was going to say that. I didn't type that because I never see it at any hobby shops.


Quote:
The #8 plug is OS's hot standard plug.
no, the A3 is the hottest standard plug they make.

http://osengines.com/accys/glowplugs.html
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Old 08-18-2006, 02:44 AM   #8
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Thumbs up Thanks guys

Thanks alot for the help, my local shops dont carry os #8 plugs but they do have A5's, have a race this weekend and want a spare cause ya never know?
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