CC displacement

Discussion in 'Gas Boats Forum' started by SCOTT WITHERELL, Jan 14, 2020 at 8:52 PM.

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  1. Jan 14, 2020 at 8:52 PM #1

    SCOTT WITHERELL

    SCOTT WITHERELL

    SCOTT WITHERELL

    New Member

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    ? if I have a 34mm piston and a 29.6 Crank, how many CC will it be now. (Stock Crank 28.0 with 34mm piston,, 26cc)and if you can why the long stroke Mod, Please shed some light on this (laymens terms .{My Lights are dim, but I'm home },,LOL . and how it affects timeing and comprestion, new to Gas Motors. thank you.
     
  2. Jan 15, 2020 at 5:06 AM #2

    Dennis Somers

    Dennis Somers

    Dennis Somers

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    Scott a 34 x 29.6 will net a 26.87cc. If we are talking specifics, the 34 x 28 is a 25.4cc ( everyone calls them 26s ). The longer stroke will add ccs obviously, increase torque slightly, and add a little power. It does this by VERY slightly upping the port timing and adding more crank leverage. If assembled carefully ( proper clearance checking ) it will increase compression, and that can be felt with quicker response.

    Gas boats are sensitive to torque ( more than nitro ). And over-all set-ups are critical for the best results. I say this because adding ccs. is no guaranty that YOUR set-up will be faster or handle better with a bigger engine. I hope that helps ya.
     
  3. Jan 15, 2020 at 5:42 PM #3

    SCOTT WITHERELL

    SCOTT WITHERELL

    SCOTT WITHERELL

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    Thank you ,Dennis, , that help a lot..
     

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