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

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    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

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

    mastmec Member

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    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

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    a 21 wil fit
  5. vette_7t9

    vette_7t9 Member

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    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

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

    SAVAGE123579 Member

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

    vette_7t9 Member

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

    SAVAGE123579 Member

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

    rockn82 Marx Brother

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    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

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