Increase volume of CMB45 RS

Discussion in 'General RC Boating Forum' started by XtremeRcBoats, Jul 10, 2019.

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  1. Jul 10, 2019 #1

    XtremeRcBoats

    XtremeRcBoats

    XtremeRcBoats

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    A friend of mine is doing rc tractor pulling (http://www.micropulling.nl/micropulling/).

    They have got a class up to 10cc (.60 cu in.) engines. He is currently running a CMB45 45 RS evo. However he would like to increase the size of the engine to get (as close as possible) to 0.60.
    Would that be possible with this engine (Bore out the sleeve and get a bigger piston)?. Or would it be possible to use a CMB67 and down size it (don't know how?).

    Who got do this job?

    Thanks for your input.
     
  2. Jul 10, 2019 #2

    PaulHail

    PaulHail

    PaulHail

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    Even if you could bore the piston out 1mm, which is probably pushing it, you'll only increase the displacement by about 10%, so that gets a .50. It would be extremely expensive to get a one off piston and combustion chamber machined, figure $300-500.

    I think he'd be much better off looking for a 10cc control line engine and replacing the venturi with a carb.

    How about a Rossi R61F speed?

    [​IMG]
     
  3. Jul 11, 2019 at 8:19 PM #3

    XtremeRcBoats

    XtremeRcBoats

    XtremeRcBoats

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    tnx Paul for the info, I'll pass that along.
     

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