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Old 12-14-2008, 07:49 PM   #1
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Default Good glowplug for RB S7?

I bought this engine from a friend a few months back, and he told me he used OS #8 plugs. I've been using them since they've worked well, although they have a pretty short life.

When I was about to place an order for some more, I saw this note:

Use only with engines that require Short Body plugs. Will not work with Novarossi, RB, and other engines made overseas.

Is that a mistake or is it possible that's why I've been having a short life with them? They do seem to work well otherwise and the engine holds a tune excellent.

If that is not a good choice, what would be recommended?
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Old 12-14-2008, 07:56 PM   #2
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either RB plugs or LRP plugs

I find the LRP plugs last longer than RB or the OS plugs that I've tried
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Old 12-14-2008, 08:00 PM   #3
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Thats the wrong plug.... OS plugs are made shorter for OS engines only.

Try Racers Edge #3 (hot) or #4 (medium)

All the RBs Ive ran liked a hot plug.
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Old 12-14-2008, 08:45 PM   #4
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Mc59's or any odonnell plug works great and cheaper. I use MC59 in S5 and S3 and in C6 I use Odonnell 97's.
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Old 12-14-2008, 09:00 PM   #5
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i need more info on this os #8 plug, I run the s7 and just put a os8 in it last race, i did not have anything else and it is running fine should i change it?
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Old 12-14-2008, 09:13 PM   #6
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Odo99, hands down. They are medium heat range plugs and work well with 30% nitro. Run any of the JP series pipes if you dont have an rb pipe and you will be in good shape.
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Old 12-15-2008, 05:05 AM   #7
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When I bought the engine it had a JP-3 installed and I ran it for awhile. Fuel economy was horrible though, barely made it through a 6 minute heat and once ran out as I crossed the loop. I put on an RB 2045 pipe and it really seemed to wake up the engine across the band and upped my runtimes to nearly 9 minutes on the same track.

Anyway, back to the question on the plug.. what is the reason that the OS8 shouldn't be used? I'm just curious as I was never aware of the "short plug" type and want to know what the potential issues are there.
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Old 12-15-2008, 06:32 AM   #8
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It is not that the plug physically wont work, the fact that it is a short reach plug does not allow for the plug to thread all the way into the combustion chamber. If you were to take the head button off the motor with the os plug installed you could see ewhat I mean.
On the jp3 pipe I agree, it is a fuel hog but the I felt the pipe did perform well. Good luck.
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Old 12-15-2008, 06:55 AM   #9
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Me and a buddy of mine run RB#6 im running a S7/L2G and my friend is running a WS7 and on his WS7 he used like only 2 or 3 plugs during this last summer's racing season and thats running almost every weekend. And im on my second plug and i have since new the break in plug lasted thru the break in and thru my first race, then i decided to change the plug out for my big race that i was going to run just so there was no problems. But i would run a RB#6 and its a meadium plug.
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Old 12-15-2008, 07:30 AM   #10
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That sounds much better, I was getting around 30 minutes of runtime per plug. I'm going to try the O'donells 99 for a few weeks and see how I like it - thanks to everyone for the info!
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Old 12-15-2008, 07:43 AM   #11
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Trinity #5 and you will be VERY happy. These plugs work well for me.
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Old 12-15-2008, 11:08 AM   #12
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Quote:
Originally Posted by Miller_Time View Post
When I bought the engine it had a JP-3 installed and I ran it for awhile. Fuel economy was horrible though, barely made it through a 6 minute heat and once ran out as I crossed the loop. I put on an RB 2045 pipe and it really seemed to wake up the engine across the band and upped my runtimes to nearly 9 minutes on the same track.

Anyway, back to the question on the plug.. what is the reason that the OS8 shouldn't be used? I'm just curious as I was never aware of the "short plug" type and want to know what the potential issues are there.

Im running a JP-3 pipe now on my new S7, and I thought about changing pipes. So does the 2045 pipe seem like it had more power and torque than the JP pipe. My run time has been around 7-8 min, so no prob with fuel mileage but i think i could use a little more low end.
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Old 12-15-2008, 11:09 AM   #13
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I always used an MC59 plug, worked and tuned great....
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Old 12-15-2008, 11:31 AM   #14
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I would run an RB #6 or a novarossi #6 for normal running conditions. You can also use a McCoy mc-8. All of those are medium plugs. Now in the winter time and for break in I like to use hot plugs. The reason being that during break in it is sometimes hard to keep the motor fired because of the really ritch settings. My theory is that the hot plug will be able to widthstand that better. I use the hots in the winter to keep heat into my motors. Some do different things but this has worked very well for me so far. You can use an RB #5 or a novarossi #5 or a McCoy mc-59 for your hot plugs. Check out the novarossi Ultra plugs in the heat ratings stated if you want a very long lasting plug.

It is really better to stick with a standard long plug in anything except OS and Go tech engines.
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Old 12-15-2008, 12:08 PM   #15
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MC59 and a Dynamite 007HT pipe has gotten me 10 minutes of runtime with 200-220 heat range at two different tracks now.
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