CC displacement

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SCOTT WITHERELL

Well-Known Member
Joined
Aug 22, 2005
Messages
186
? 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.
 

Dennis Somers

Well-Known Member
Joined
Oct 20, 2011
Messages
164
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.
 

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