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OS21tm (Revo) question

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Old 03-19-2009, 07:00 AM
  #1
Rawlpower
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Default OS21tm (Revo) question

Hi

My TRX3.3 on my Revo has died (again) and I'm looking at the OS21tm (Revo) engine as a drop in replacement.

Could somebody please advise on whether it is necessary to open the engine and carb to clean out metal filings before running the engine?

Also, is it necessary to seal the backplate and carb. with RTV before running the motor?

And also, can one use the same run in procedure for the OS21 as for the TRX3.3 (the 5 tank Traxxas run in schedule?)

Thanks
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Old 03-19-2009, 09:49 AM
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Default RE: OS21tm (Revo) question

yes...yes...yes
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Old 03-19-2009, 04:18 PM
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Default RE: OS21tm (Revo) question

you dont have to seal the motor, air leaks are rare with OS....... traxxas break in works, just try to stay ABOVE 200°
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Old 03-20-2009, 01:46 AM
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Default RE: OS21tm (Revo) question

Excellent thanks guys. When I have some spare cash I'm going to make the leap.
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Old 03-20-2009, 06:45 AM
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Default RE: OS21tm (Revo) question

I know I sound like a broken record here with the picco recommendations but why pay 300 bucks for the .21tm when you can have the .26 red dot for 200? More power and 100 dollars cheaper.
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Old 03-20-2009, 06:58 AM
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Default RE: OS21tm (Revo) question

Quote:
ORIGINAL: fabrimacator21

I know I sound like a broken record here with the picco recommendations but why pay 300 bucks for the .21tm when you can have the .26 red dot for 200? More power and 100 dollars cheaper.
You get what you pay for my friend... The OS is a smooth running motor. very easy to tune.

plus a two yr. warranty... not saying it will cover anything or everything, but any manufacturer that has a two yr. warranty on an rc motor are pretty confident in there product.

picco has 30 days

By the way hopmeup rc (ebay store) has TM .21's for 250 shipped.
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Old 03-20-2009, 08:09 AM
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Default RE: OS21tm (Revo) question

The o.s motors won't last any longer then the picco's. Both o.s and picco are known for making 10+ gallon motors. The .26 medium block picco's run like a top... smooth, nice idle, and INSANE power when properly sealed. Basically your paying less for more motor but have to seal it. For me thats not a big deal... some think that makes it a lesser quality motor but in reality your getting a hell of a deal. Sealing only takes 20 minutes and IMHO it should be done on every motor.
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Old 03-20-2009, 08:13 AM
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Default RE: OS21tm (Revo) question

Fabricamator23

Thanks for you comments. I understand that the Picco is also a good motor. My limitation is that I'm in South Africa and I know the OS21 is locally available. I think the Picco is not, which means I will have to ship the motor in and then have zero backup/spares availability for it.

regards
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Old 03-20-2009, 08:16 AM
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Default RE: OS21tm (Revo) question

In that case the tm is a good choice. Have fun[sm=shades_smile.gif].
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Old 03-20-2009, 04:12 PM
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Default RE: OS21tm (Revo) question

Quote:
ORIGINAL: rockorevo

Quote:
ORIGINAL: fabrimacator21

I know I sound like a broken record here with the picco recommendations but why pay 300 bucks for the .21tm when you can have the .26 red dot for 200? More power and 100 dollars cheaper.
You get what you pay for my friend... The OS is a smooth running motor. very easy to tune.

plus a two yr. warranty... not saying it will cover anything or everything, but any manufacturer that has a two yr. warranty on an rc motor are pretty confident in there product.

picco has 30 days

By the way hopmeup rc (ebay store) has TM .21's for 250 shipped.
+1 os has superior casting and maching, also superb carbs.
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Old 03-21-2009, 01:46 PM
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Default RE: OS21tm (Revo) question

o.s .21tm is an amazing motor. My revo flysss. the picco .26 red dot is a good motor, but not a good racing motor, but if you like to ef around the .26 does get the job done. I've had my o.s .18 in my maxx for 3 years and still rips. idk, i'm just a o.s person. lol
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Old 03-21-2009, 06:13 PM
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Default RE: OS21tm (Revo) question

Why do you say the picco isn't a good racing motor?
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Old 03-21-2009, 11:11 PM
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Default RE: OS21tm (Revo) question


Quote:
ORIGINAL: fabrimacator21

Why do you say the picco isn't a good racing motor?
It's too powerfull, it's more an ON/OFF motor
I like mine
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Old 03-21-2009, 11:31 PM
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Default RE: OS21tm (Revo) question

racing all about smoothness...fast motors are for the pros who have god like control over there r/c. other wise most prefer 'slower ' motors....
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Old 03-22-2009, 02:24 AM
  #15
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Default RE: OS21tm (Revo) question


Quote:
ORIGINAL: dakamat


Quote:
ORIGINAL: fabrimacator21

Why do you say the picco isn't a good racing motor?
It's too powerfull, it's more an ON/OFF motor
I like mine
No such thing... just need throttle control.
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Old 03-22-2009, 03:03 AM
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Default RE: OS21tm (Revo) question

or lower the EPA. lol my revo can still wheeie ay 55% epa, with arms level. beat that...
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Old 03-22-2009, 03:18 AM
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Default RE: OS21tm (Revo) question

Quote:
ORIGINAL: absolutemayhem

or lower the EPA. lol my revo can still wheeie ay 55% epa, with arms level. beat that...
Beat that? lol is that directed at me?

Are you still trying to say your .18tz will kill my .28 picco p3? lolz
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Old 03-22-2009, 03:32 AM
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Default RE: OS21tm (Revo) question

please....... tmaxx are made to wheelie........if i wanted a money pit i would of put an os .28 ( picco slayer )im my revo..... LOL
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Old 03-22-2009, 03:45 AM
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Default RE: OS21tm (Revo) question

the os .28 and the picco .28 made almost identical numbers... don't know if I'd call it a picco slayer. The os is $100 more expensive then the picco for the same power.
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Old 03-22-2009, 08:43 AM
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Default RE: OS21tm (Revo) question

fabrimacator, i dont know who blows out more hott air, you, or a picco .26 around the carb neck. HAHA


The man asked for advice on a OS and we gave it to him. do you have stock in picco or something? quit trying to sell the man junk

as I said earlier, you get what you pay for.
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Old 03-22-2009, 10:06 AM
  #21
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Default RE: OS21tm (Revo) question

Quote:
ORIGINAL: fabrimacator21

the os .28 and the picco .28 made almost identical numbers... don't know if I'd call it a picco slayer. The os is $100 more expensive then the picco for the same power.
lol. the OS still makes more power, more top end and you dont have to worry bout air leaks. you get what you pay for ..........just relax everybody.....
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Old 03-22-2009, 05:05 PM
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Default RE: OS21tm (Revo) question


Quote:
ORIGINAL: rockorevo

fabrimacator, i dont know who blows out more hott air, you, or a picco .26 around the carb neck. HAHA


The man asked for advice on a OS and we gave it to him. do you have stock in picco or something? quit trying to sell the man junk

as I said earlier, you get what you pay for.

You need to read... I'm talking to absolute about a .28 picco not trying to sell anything to the OP. He's already said he's buying the O.S. .21tm. No stock in picco... they are just a good cheap mill and having owned a couple I think they get a bad rap from people like you. Your only argument is sealing the carb... after that what makes it garbage? This is what I mean. If sealing a carb is worth the extra price tag to you then by all means go right ahead and buy what you want... but there are people who don't mind 15 minutes of sealing for a cheap, quality motor.

Absolutemayhem: Have you run the o.s and picco .28's? How do you know it has more rpm?

The o.s. is more of a top end motor while the picco has more low end. Both make very similar peak numbers.
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Old 03-22-2009, 07:46 PM
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Default RE: OS21tm (Revo) question

a GO engine is good for the money, dosent mean it the quality of a os vzb. thats why ppl pay 300+ for there motors. no sealing, no vapor lock, rock solid tunability. ive heard several p3 owners say the carb is real finicy, but once you get a tune it ok..... although i belive the 21tm is over priced, and there are better engins at that price, like NINJA motors..... if you REALLY want a bang for your buck, check out the novarossi 21 bf ($150), or the RB s3 l2g ( $180) . these are perfect bb engins for the REVO. and you get race spec. carbs, con rod, p/s. p3 is just a tourqe engine,, not a good match for any 9lb. truck......
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Old 03-26-2009, 10:48 PM
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Default RE: OS21tm (Revo) question

Dude the p3 has not just a torque engine.... How do you call the bb with the 3rd highest HP on a dyno just a torque engine?

By the way the o.s. .28 is a non pullstart... so you'll need a bumpstart (another 100).

Also I've read tons of post saying the picco is an awesome running motor with decent tunability and it holds a tune forever... I've had the same experience with mine.

Why talk about a motor that you've never owned or run like you know everything about it? Have a look see on the savage forum... good reports on it left and right.

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Old 03-27-2009, 04:35 PM
  #25
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Default RE: OS21tm (Revo) question

thats where i got my info.. the 20+ page thread about the picco...i never said it wouldn't hold a tune....but you cant deny the os is superior...if you complain about price, your in the wrong hobby...........anyways, you your self said the picco tunes" decent", .... starter box? i have one, thats how i start my tz......revo is awsome because it opens a whole new worl of engines....as where the savages and tmaxx are only a handful..( lrp vs picco) ...... anyways WHY did you dig up this tread?? it was hijacked after the 3 post.......
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