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  1. #1

    Join Date
    Jan 2007
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    Ojai, CA
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    Engine Swap Questions

    Just wondering if the HPI Nitro Star K4.6 would fit my Tornado BB Pro without too much mods? Or what would be the BEST option for upgrading engines?

  2. #2

    Join Date
    Feb 2006
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    howard beach, NY
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    RE: Engine Swap Questions

    os .18 cvrx : http://www2.towerhobbies.com/cgi-bin...?&I=LXGGP7&P=7 perfect fit and much more power than the stock engine
    125 characters and 2 lines is not enough to list my RC obsession!!!

  3. #3

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    This motor is much better than the stock Team Infinity that I have in there now?

  4. #4

    Join Date
    Feb 2006
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    howard beach, NY
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    RE: Engine Swap Questions

    bro, i have 2 of them i swapped it in my hpi rs4 3 evo and my t maxx. much more power than the stock one
    125 characters and 2 lines is not enough to list my RC obsession!!!

  5. #5

    Join Date
    Jan 2007
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    Ojai, CA
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    RE: Engine Swap Questions

    How about this one....O.S. 18TZ (S) Turbo w/Rotary Carb?

  6. #6

    Join Date
    Feb 2006
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    RE: Engine Swap Questions

    that has a rear exhaust and wont work on the redcats, you need a side exhaust
    125 characters and 2 lines is not enough to list my RC obsession!!!

  7. #7

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    The only mod I would have to make is cut the body though....right?

  8. #8

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    Feb 2006
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    howard beach, NY
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    RE: Engine Swap Questions

    i dont think you would have to do that, you may need to trim the body but i dont think so, besides that it will bolt right in and you will be very happy with it and its not that much money, make sure you upgrade the clutch bell too so you dont rip the gears.
    125 characters and 2 lines is not enough to list my RC obsession!!!

  9. #9

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    I was talking about with that rear exhaust motor. For some reason, I think the more power, the better, but I should get used to the car first ehh?

  10. #10

    Join Date
    Feb 2006
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    howard beach, NY
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    RE: Engine Swap Questions

    i dont think the car is setup to use a rear exhaust motor, theres not enough room behind it, it would be a good idea to use it a little first, the .18 that comes with the redcat isnt a slouch.
    125 characters and 2 lines is not enough to list my RC obsession!!!

  11. #11

    Join Date
    Jan 2007
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    Ojai, CA
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    RE: Engine Swap Questions

    Yeah, I got the Pro model, so it has the Team Infinity Motor in it, it says it will do 65, but I am sure that is with pure Nitro and the upgrades?

  12. #12

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    Also, I was wondering if a motor with a round exhaust outbore is better than the retangular one? It seems like the air flow is retricted with the retangular. But who am I to say?

  13. #13

    RE: Engine Swap Questions

    If I was you I would use these engiens much much better, http://www.stsmicroengines.com/index.php?main_page=product_info&cPath=12&products_id=22

    there awsome engines, we sell them and use them in our race cars.
    Dealer for..Redcat, Traxxas, Associated, Cen, Racers Edge, RD Logic, Losi, HPI, E-flight, Himoto, Venom, Heli-Max, O.S...etc

  14. #14

    Join Date
    Feb 2006
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    RE: Engine Swap Questions

    ORIGINAL: Tornado BB Pro

    Also, I was wondering if a motor with a round exhaust outbore is better than the retangular one? It seems like the air flow is retricted with the retangular. But who am I to say?
    you can use a different header, something for an hpi .15 should work, i put one in my hpi rs4 3 evo and it bolted up to the os engine, just make sure its for the same side exhaust. that engine all aboutfun posted is nice but its not as powerful as the os .18, its good for racing since thats the size engine allowed. Also that sts engine has a slide carb and you need a rotary one. I was looking to get the .28 sts for my hurricane
    125 characters and 2 lines is not enough to list my RC obsession!!!

  15. #15

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    Is the .18 not allowed in racing?

  16. #16

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    Feb 2006
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    RE: Engine Swap Questions

    from what i understand, true racing is only .12 allowed. i dont race professionally and thats why i put the os engine in, more power, lol
    125 characters and 2 lines is not enough to list my RC obsession!!!

  17. #17

    Join Date
    Jan 2007
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    RE: Engine Swap Questions

    Well hopefully they will have a class with the .18 here in Cali. If not, I guess I am buying a new engine!

  18. #18

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    Feb 2006
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    RE: Engine Swap Questions

    lol, maybe they would believe it a .12, lol
    125 characters and 2 lines is not enough to list my RC obsession!!!

  19. #19

    Join Date
    Dec 2006
    Location
    Denver, CO
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    540

    RE: Engine Swap Questions

    i looked at the engine and it said it needs 5-30% nitro. and no less than 18% oil content. does that mean no traxxas 33% or does traxxas 33% have enough oil?

  20. #20
    mozzzy_2000's Avatar
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    RE: Engine Swap Questions

    the amount of oil content used is debatable really. Some people prefer more oil than others whilst others do not. Some engines prefer less than others and some do not. You'd able to get way with using 33% but just use more care and I'd say that your engine(or any engine) will need to be shimmed for that % of nitro. This reduces the engine's compression, otherwise you risk premature engine wear.

  21. #21

    Join Date
    Dec 2006
    Location
    Denver, CO
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    540

    RE: Engine Swap Questions

    i haven't ran the 33% yet on my engine that i have now. and when i took off the cooling head a couple days ago to clean it all out i didn't find a shim. should i have had one? and where can i get a shim for when i switch to 33%? thanks


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