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junior/S3 vs N21BF

junior/S3 vs N21BF

Old 07-12-2009, 10:42 PM
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Default junior/S3 vs N21BF

Soon I will be in the market for a new engine and am looking at these 3 port engines. If anyone has any experience with these two I'd like to hear how these compaire to each other or if there is another 3 port that is better than these.
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Old 07-12-2009, 10:56 PM
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not just being biased toward novarossi products but the n21bflimited is a serious engine for around 150$
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Old 07-12-2009, 11:55 PM
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Originally Posted by omarwashington View Post
Soon I will be in the market for a new engine and am looking at these 3 port engines. If anyone has any experience with these two I'd like to hear how these compaire to each other or if there is another 3 port that is better than these.
Iv had an s3&bf limited and would buy the bf before the rb only for the reason you can save about $50. just cause its ultra cheap dont mean anything. both are very similar in so many ways. do you want black or orange. $150or200
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Old 07-13-2009, 08:11 AM
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I run the nova n21bf limited edition in my 8ight 2.0. I will highly recommend this engine to anyone. Its pretty strong for a 3 port at $150. I was running the odonnel #99 but switched to the #100 plug and I do like it best.
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Old 07-13-2009, 08:25 AM
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nova bf is the sh!t for 150...hall spend another 50 and get it modded and you will have a serious screamer for around 200
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Old 07-13-2009, 09:55 AM
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Talk to houston about a race tuned bf. great price with great support. you really cant ask for more.
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Old 07-13-2009, 10:50 AM
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ya I have an extra piston/sleeve and conrod from an old S3 with less than 4 gallons on it which i can use on the junior if i ever get it. But the price of the BF looks really good.
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Old 07-13-2009, 11:05 AM
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i can definately see how that could effect your choice. it does seem like everytime i keep spare engine parts around i never use them. but when that one time happens im sure i'll wish i had them
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Old 07-13-2009, 06:55 PM
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I have an old msc s3 that still kicks ass!! I ran this engine last year and the tune was off. It climbed to over 400 degrees and it was still running!! And it still has compression!! I also had the Novarossi BF 2001 HOT MODS. It was a monster. Just buy both for under 400 bucks There both great engines.
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Old 07-20-2009, 01:49 PM
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Junior/S3
crank case 209$
Piston/Sleeve/Connecting Rod 189$

are these guys on crack?
For that price your better off the same engine.
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Old 07-20-2009, 04:07 PM
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Han an old S3 - seriously, I had to kill it - it just would not die.
I put it in an old MBX4 without wheels and reved it while leaning it.
Coling head went gray, and the receiver box melted eventualy it stopped - due to lean mix.
5 minutes after stopping my tempgun still said HIGH.
Out of curiosity I wanted to try it again, the glowplug melted, so I got it a new one. Started and ideled like nothing ever happened......

I was sick and tired of that engine, and it was on its ninth gallon so... I threw it away.
Werent able to take of the clutch either, stuck.

I havent tried the N21 yet, but the S3 is hard to beat, in regards of toughness
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Old 07-20-2009, 04:40 PM
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The S3 was my first nitro engine. I think I will get another one.

Last edited by omarwashington; 07-20-2009 at 04:41 PM. Reason: blaa.
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Old 07-20-2009, 05:34 PM
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i've had both, the s3 is indistructable. sold it with 3 gallons and it is still running on the other side of the world. had the t21bf, it was pretty good for 2 gallons, i sold it and it did not last another gallon after that, firs the crank snapped then the sleeve cracked. then i got a go 3port used with a gallon on it, ran it another 5 gallons (case cracked then sleeve cracked inside a wrong case, bad idea) and it easily had superior performance to the other 2 (my tuning and driving had improved greatley at the time also). i would get the rb knowing the go 3port's would probably be faster than me but the rb will still be in my box next year.
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Old 07-20-2009, 05:36 PM
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I just picked up a Novarossi Limited 21 BF. Gonna take it apart and double check it all this weekend. Clean it up abit if needed and finish breaking it in. I was told maybe 3/4 of gal on it so better safe than sorry to add some heat cycles to it. I think any Novarossi or RB motors are 95% good. I got one S5 back then when the carb design was changed abit and it gave me all kinds of fits. I ended up selling it with my 777 back as a complete package. Had less than 3/4 gal on it but it just wouldnt act right. I have since used another S5 and it was fine, a WS7 that screamed, a Trinity Extech .21 that snapped the crank in two with less than a gal and half on it a Sirio CL7B Sti that snapped the crank also with around the same mileage. I am getting two replacement crankshafts here soon I hope...at least that is what I was told.
The Novarossi is gonna be the back up for the buggy as I have faith in it more than the Trinity and Sirio line.
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Old 07-22-2009, 12:20 PM
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Looks like the 21BF is popular by far than the junior. Lots of good reviews on the BF.
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