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Thread: 15F Big-Bore

  1. #1
    RonJon's Avatar
    Join Date
    Sep 2007
    Sarasota, FL

    15F Big-Bore

    What it the most displacement that can be had from the 15F motor?
    I'm aware of a 1600cc option, but I thought I saw someone say 1800cc ??? What about with steel sleeves???

    Sorry if this thread has been done bofore but the other ones seemed to get off-topic...

  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    The issue comes from the supporting parts, its cheaper to supercharge or turbocharge it, because there are no off the shelf parts available for a bigbore motor. the 1600 kit is designed for a supercharged motor and only runs 9.5 to 1 compression. you can go the route I am and put in cams, high compression forged pistons, and a massaged cylinder head. It will be cheaper than boring an getting custom parts made and easier on the stock parts. The only other way I would go is a supercharger or turbo. it costs a nice chunk of money to bore and plate the cylinders for not that much extra displacement. As far as max bore I would not go more than 86mm and that would be really big, 86mm would make the walls pretty thin.


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