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RB .21 s3 fuel question

RB .21 s3 fuel question

Old 09-22-2008, 08:23 AM
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Default RB .21 s3 fuel question

I have a question about what fuel brand and nitro % to run with a new RB s3
l2g .21 engine. the manual says 15%-25% is recommended but im just wondering what everyone is running. also what plug is everyone running, the motor came with a 6 and just wondering if people are runnning OS's, odonnel's, ect.... any info greatly appreciated...thanks Mike Williams
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Old 09-22-2008, 09:25 AM
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I am running 30% Sidewinder in mine and it runs great.
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Old 09-22-2008, 02:09 PM
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did you add the .1mm shim
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Old 09-22-2008, 04:06 PM
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Hello,

Werks 30% is the best fuel I have ever run with my RB engines. It clears out well and runs cooler. A good combo would be the Odonnell ODO99 plug, with Werks 30%. If its modified run the ODO97 or hot plug.




Put the RB S5 or S7 crank in your S3, port it, and run a turbo head. I call that the RB Speed... LOL!

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Old 09-22-2008, 09:59 PM
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inside-line, did you add the shim under the head??
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Old 09-22-2008, 11:06 PM
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To be on the safer side, you can add the shim. If it has more than 2 gallons, some will take it out.
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Old 09-23-2008, 08:05 AM
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I didn't add the shim
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Old 09-23-2008, 09:39 AM
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I run 25% Byrons in all my RB's & have for a while. The motors are clean on the inside when I inspect them & they run cool & hold up for a long time.
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Old 09-27-2008, 01:09 PM
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i am breaking my s3 in and i have about 6 tanks on it and about 3 tanks still to go per the instructions. very happy with this mill....i will post tomarrow after i go race..thanks for all the advice!
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Old 09-27-2008, 03:40 PM
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Sorry if this is off topic, but how is your Mach 427 engine running Mike? Did it last long? It looks like a good engine for truggy, and it's super cheap.
Thanks!
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Old 09-27-2008, 05:08 PM
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you need to add the shim or it will add to premature plug failure
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Old 09-27-2008, 06:46 PM
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I ran Odonells 20% and byrons 20% both worked fine in my RB's. Your going to love that mill. Just take your time she's not going to lift her dress up until after a gallon. Make sure you leave it a tad rich on the lsn.
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Old 09-27-2008, 08:34 PM
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chrobar, the 427 is a great motor. has a smooth power band and pretty good on fuel and great on the pocket book. it has about 4 gallons and good compression and good pinch.

jamminary, i took out 1 .1mm shim and added a .17mm shim in its place. thanks for the info.
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Old 09-27-2008, 09:36 PM
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jamminary, i took out 1 .1mm shim and added a .17mm shim in its place. thanks for the info.[/QUOTE]

i love my rb motors!!! they are so reliable and run excellent!
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Old 09-28-2008, 08:56 PM
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well, i love it. runs great and it's not completely tuned yet. how do i determine it the (lsn)idle/air is to fat. it seems a little loaded when i give it gas, but seems good every were else. 240-250 f all day and i got about alittle more than 6 min on a tank...i'm wondering if i need the RB pipe. i have a dynamine 086 pipe. just wondering.
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