O.S. 21TM-T .21 Engine w/T-Maxx Manifold

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The O.S. 21TM-T .21 Engine w/T-Maxx Manifold is a great option for those looking to get a little more out of their Traxxas T-Maxx or. A LC3 glow plug is used with this engine for improved power, better fuel economy and durability. The carburetor used offers easy handling as well as high end performance. 

Features:
  • Great option for the Traxxas T-Maxx 2.5 and 3.3
  • Uses a LC3 glow plug for outstanding performance
  • Carburetor offers easy handling and top end performance
  • Includes Traxxas style manifold
Specifications:
RPM Range: 3,000 - 35,000 rpm
Recommended Fuel: 10-30% nitro content, 20% for break-in
Width: 1.5 in (39 mm) at mounting tabs
Carb Type: 11K three needle slide valve
Height: 4 in (101 mm)
Stroke: 0.590 in (15 mm)
Plug Type: LC3
Length: 2.1 in (53.6 mm) from backplate to drive hub
Displacement: 0.213 cu in (3.49 cc)
Bore: 0.669 in (17 mm)
Total Weight: 8.57 oz (243 g)
Type: 2-stroke glow powered 1/8 scale monster truck engine
Crankshaft Type: Threaded
Crankshaft Threads: M7x1
HP: 1.77 HP (1.8 PS) @ 29,000 rpm

Includes:
  • (1) O.S. 21TM-T .21 Engine
  • (1) LC3 Glow Plug
  • (1) 2.5 Manifold
  • (1) Manual

This product was added to our catalog on December 8, 2018

Brandon Liefer
Verified Owner
Sunday, Apr 23 2023 (11 months ago)
O.S. 21TM-T .21 Engine w/T-Maxx Manifold
Quality is great however you will need to buy a different air cleaner setup to put in a T Maxx nitro 3.3.Everything was easy swapping out the stock 3.3 for this little powerhouse except a couple small things.
1) you will need a dremmel to grind a little bit off the base if you want to hook up the factory rpm sensor .
2)you will need a new air cleaner setup or a reducer as the carb hole is bigger than factory (I used the os 203 kit on one and a losi m8 on the other ) and they both worked equally as well )
3)It was hard for me to tune because id never tuned one before …I ran 4 tanks for break in then it took me another 4 tanks to get a tune I was semi satisfied with and another 2-3 to get it where i felt it was really dialed in!
4) you will need a GOOD wheelie Bar as this little Basxxxd has some serious power and or responsive characteristics compared to stock! I can’t keep the front down it wheelies at 1/3 throttle and has enough axx to flip this dude on accident frequently!!!
5) Tell your significant other to be prepared because it will create a definite chubby!
Andries Buskens
Wednesday, Jun 14 2023 (9 months ago)
O.S. 21TM-T .21 Engine w/T-Maxx Manifold
Love love love my OS TM engines!! Fantastic small blocks that scream and have way more torque then any other small block ever made
Michael Anderlie
Verified Owner
Friday, Jul 8 2022 (about a year ago)
O.S. 21TM-T .21 Engine w/T-Maxx Manifold
I purchased this engine for my Tmaxx 3.3 and these OS .21 TM engine is the best .21 size engine you can buy and install and run in Tmaxx’s. Its starts and idle very easy i followed the break in using Adam Drake method. Since the instructions dont give whole lot information. But once that done i tuned the engine and wheelies every time. Its built so well and all the parts seemed to be machined rather then cast which is nice. Only small complaint is the back plate uses Phillips screws instead of Allen hex but other then that This OS engine is the way to go for Any Tmaxx.
Barry Brannon
Verified Owner
Wednesday, Feb 7 2024 (7 weeks ago)
O.S. 21TM-T .21 Engine w/T-Maxx Manifold
Best upgrade I did on my T-Maxx. Tuning is straight forward. Idles great. Low end torque is insane. Would recommend to anybody and purchase again.