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Thread: size

  1. #1
    RC Racer
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    size

    what size engine is the 3.3 is it a .21??
    Slayer with Picco .26
    want a jato!

  2. #2
    RC Racer
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    i think its a .20 cubic inch

    not 100% sure. correct me if im wrong please

  3. #3
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    Its a .20 cid 3.3 cc

  4. #4
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    .2013784 to be exact
    2-strokes: it aint fast unless u mix the gas.

  5. #5
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    now thats getting precise.

  6. #6
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    but i just tell people its a .21 because thats a common size. just like the dirtbike companys round up there bike engines sizes (ktm the most) there 525cc motor is really a 510cc or a 505cc i cant remeber. polaris also does it with there rzr's too. its says 800cc when its really a 760cc
    2-strokes: it aint fast unless u mix the gas.

  7. #7
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    I know exactly what you mean. Since the discussion of engine sizes is being discussed am I correct to assume the 2.5 is approx .18?

  8. #8
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    the trx 2.5 is a .15 its a common misconception because it has the power of other .18s in its class (hpi firestorm, xtm xcellerator.) its weird because its piston is actually smaller in diameter that the old slower pro.15. the stoke is much larger on the 2.5, wich makes for its extra power. the 2.5 is also ported better, has a rear exaust port, and a bigger carb.
    2-strokes: it aint fast unless u mix the gas.

  9. #9
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    Thank you sir. I was wrong in my assumption.

  10. #10
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    soo how come some people perfer the os .18 over the 3.3 which is a .20

  11. #11
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    i honestly have no idea. i have never owned an os engine. only traxxas's. (a pro.15 and 2.5 and 2 3.3's)
    i personallt think traxxas should make a trx2.0 (.12) a trx3.0 (.18) and a trx4.6 (.28) and cover all the common engine sizes from .12 to .28
    2-strokes: it aint fast unless u mix the gas.

  12. #12
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    why exactly do people change engines to os etc? ive heard people say they dont even run the traxxas,but change immediately,my traxxas engines run just fine
    Master of Traxxas engine longevity....

  13. #13
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    yeah i agree i mean i can understand why you get a bigger engine but if it is going to be the same size seems pointless
    Slayer with Picco .26
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  14. #14
    RC Turnbuckle Jr.
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    Even though if the engine is the same size .20 or .21 for example the engine can still have more hp RPM ect. The Cubic inch size of a motor is not everything. Engines can have different construction and be ported differently an east way to see this is with the picco .26 size engines.

    Picco .26 max
    hp 2.5
    RPM 32,000

    Picco .26 max red dot
    hp 2.7
    rpm 34,000

    Picco.26 max outlaw
    hp 2.7
    rpm 37,000
    ⓘ ⓐⓝⓣ ⓣⓗⓘⓝⓚ ⓞⓕ ⓐⓝⓨ ⓣⓗⓘⓝⓖ ⓖⓞⓞⓓ ⓣⓞ ⓦⓡⓘⓖⓗⓣ ⓗⓔⓡⓔ

  15. #15
    Marshal carraig042's Avatar
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    Quote Originally Posted by cadmanslayer46
    why exactly do people change engines to os etc? ive heard people say they dont even run the traxxas,but change immediately,my traxxas engines run just fine

    Some people are hardcore when it comes to being loyal to a company. Engines like OS have a great reputation. I personally run trx motors. They are cheap and perform great.

    -Brett
    4wd Sportmaxx 3.3
    E-Revo - Mamba Monster - Neu 4s

  16. #16
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    what is the horse power of the 3.3????
    Slayer with Picco .26
    want a jato!

  17. #17
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    I saw a dyno sheet from ABMods and it showed .98 hp stock

  18. #18
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    The O.S. .18TM with smaller displacement is a little better with fuel consumption. In stock form also has more HP than a stock 3.3. With a good header/pipe, and tune you've got a killer motor.

    Model Name: O.S. 18TM
    Part Number: 11931(Revo) 11930(T-Maxx)
    Price: $220.00 (Approx. Street Price)
    Displacement: 0.183ci (3.0cc)
    Bore: 0.629" (16mm)
    Stroke: 0.590" (15mm)
    Practical RPM: 3000-34,000
    Output: 1.6hp @ 29,000rpm
    Weight: 8.22 oz. (233g)
    Carburetor: 11K Slide-Valve
    Glow Plug: LC3

  19. #19
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    so if i got the OS 21tm i would have more HP and better fuel?
    Slayer with Picco .26
    want a jato!

  20. #20
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    Quote Originally Posted by N9Ne_Breaker
    so if i got the OS 21tm i would have more HP and better fuel?
    Not sure about the fuel consumption part, my guess is that it would be pretty close to the stock motor. You would have more power with around the same weight as the 3.3. Plus it's a direct drop in , you don't need to change the motor mounts and stuff. The cost, I think is what deters alot of people from this motor.

  21. #21
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    SPECIFICATIONS
    Stock Numbers:
    OSMG2082 21TM w/Revo Manifold
    OSMG2083 21TM w/T-Maxx Manifold
    Displacement: 0.208 cu in (3.41 cc)
    Bore: 0.669 in (17.0 mm)
    Stroke: 0.590 in (15.0 mm)
    Practical rpm: 3000-35,000
    Output: 1.8 hp @ 29,000 rpm
    Weight: 8.57 oz (243 g)
    Includes: 11K-R carb (Revo)/11K carb (T-Maxx), LC3 glow plug

  22. #22
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    what about tuning issues with other brands?
    Master of Traxxas engine longevity....

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