50’s 18hp OMC retrofit question

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This topic contains 19 replies, has 5 voices, and was last updated by Avatar shoestringmariner 2 days, 14 hours ago.

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    wbeaton
    Canada Member - 1 Year
    Replies: 584
    Topics: 65
    #173495

    What I meant was there are no parts to swap either internal or external that will increase the hp of your 18 hp. The only complete powerhead swap that might work is a 1970’s 25 hp because it shares roots with your motor. Personally, I don’t care if you hot rod a 1950-60’s 18 hp. There is nothing rare or special about them. Enjoy the hobby the way you want. I’m just trying to save you some trouble and possible expense.

    Wayne
    Upper Canada Chapter

    uccaomci.com

    Avatar
    garry-in-tampa
    Lifetime Member
    Replies: 3008
    Topics: 29
    #173496

    I believe they went to the 50 to 1 ratio with the light tension “pressure back” piston rings. . .

    Avatar
    rudefan29070
    US Member - 1 Year
    Replies: 13
    Topics: 4
    #173504

    I believe they went to the 50 to 1 ratio with the light tension “pressure back” piston rings. . .

    And the pressure back was on the 2 ring pistons, right?

    Avatar
    shoestringmariner

    Replies: 234
    Topics: 47
    #173507

    What I meant was there are no parts to swap either internal or external that will increase the hp of your 18 hp. The only complete powerhead swap that might work is a 1970’s 25 hp because it shares roots with your motor. Personally, I don’t care if you hot rod a 1950-60’s 18 hp. There is nothing rare or special about them. Enjoy the hobby the way you want. I’m just trying to save you some trouble and possible expense.

    Avatar
    shoestringmariner

    Replies: 234
    Topics: 47
    #173508

    What I meant was there are no parts to swap either internal or external that will increase the hp of your 18 hp. The only complete powerhead swap that might work is a 1970’s 25 hp because it shares roots with your motor. Personally, I don’t care if you hot rod a 1950-60’s 18 hp. There is nothing rare or special about them. Enjoy the hobby the way you want. I’m just trying to save you some trouble and possible expense.

    Where’s the like button?
    I appreciate your thoughts and advice

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