Biggest engine to fit on RS4 3

Discussion in 'RC Onroad Forum' started by vette_7t9, Mar 14, 2004.

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  1. vette_7t9

    vette_7t9 Member

    What is the biggest engine that can fit on an RS4 3 RTR? I am guessing .21? which is pretty extreme i am sure. Can i atleast fit a .18 on it? I want mine to be a muscle car.
  2. vette_7t9

    vette_7t9 Member

    Plane engines? Are those better? How bout 4 stroke?
  3. mastmec

    mastmec Member

    Any small block will fit as long as it has the right crank shaft. Plane engines usually don't have big enough cooling head and aren't built for the rpm that a car needs. four strokes will work too, big difference in gearing though.
  4. SAVAGE123579

    SAVAGE123579 Member

    a 21 wil fit
  5. vette_7t9

    vette_7t9 Member

    Hmmm, that sounds awesome! But does a bigger engine sound more muscly? Is an RS4 with a .21 legal for racing in its class?!?
  6. mastmec

    mastmec Member

    Louder, not leagal
    More weight
    Less RPM, have to regear
    New engine mounts,header,pipe ($$$$$$)?
  7. SAVAGE123579

    SAVAGE123579 Member

    yea not legal bug alot more fun to say he well i have a 21 in mine! haha
  8. vette_7t9

    vette_7t9 Member

    Maybe the chassis isnt designed fr such big engines, it might offset the balance....
  9. SAVAGE123579

    SAVAGE123579 Member

    the handling will be a bit off but if ou dial it in right it should be fine
  10. rockn82

    rockn82 Marx Brother

    New era models makes an entire .21+ conversion kit for the rs4 along with tons of hop ups. Check them out.
  11. mastmec

    mastmec Member

    A four stroke would give it a deeper tone and drop in.
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