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  1. #1
    RC Qualifier
    Join Date
    Feb 2011
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    392

    Question about an engine

    I'm looking at putting a hyper 21 in my revo 5309 what do I need to put it in is this a bb do I need the bb kit
    drive it like you stole it

  2. #2
    RC Champion
    Join Date
    Nov 2003
    Location
    Long Island, NY
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    2,602
    The hyper 21 is a big block. You would need the New Era BB kit. The Traxxas kit does not give enough clearance for the pull start.
    Rustler-3.3,Revo-Hyper .21,Jato-3.3
    lots of mods

  3. #3
    RC Qualifier
    Join Date
    Feb 2011
    Posts
    392
    It will be a roto start do I have to have the new era
    drive it like you stole it

  4. #4
    RC Champion
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    Nov 2003
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    Long Island, NY
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    Not sure. I have the pull start on mine and the rear a arm hit the pull start with the traxxas kit.
    Rustler-3.3,Revo-Hyper .21,Jato-3.3
    lots of mods

  5. #5
    RC Qualifier
    Join Date
    Feb 2011
    Posts
    392
    How do you like the 21 on it is it quicker and is it easier to tune and hold it
    drive it like you stole it

  6. #6
    RC Champion
    Join Date
    Nov 2003
    Location
    Long Island, NY
    Posts
    2,602
    Power wise it wasn't much different than the 3.3 but I also did the FOC and center diff at the same time so it wasn't a true comparison. I do find tuning easier and it holds the tune better.
    Rustler-3.3,Revo-Hyper .21,Jato-3.3
    lots of mods

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