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Which ratio?

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  • Which ratio?

    Hi there...

    I've just been told by my mechanic that my leg has one hour to live! So after hunting around the conclusion I have come to is to get an SEI.
    I have a 1984 Donzi 18 Classic running a 350 Chev approx 280hp. The current ratio of my Mercruiser is apparently 1.5. and my prop is a 22. With this setup my engine doesn't rev past 4500rpm at full throttle, giving me a top speed of 55mph.
    My question is what SEI ratio should I run 1.47 or 1.62? I'm thinking 1.47 that should give me slightly better low end and maybe the engine will actually rev a bit higher still giving me the same top end?????

  • #2
    ooops my prop is a 21p not a 22

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    • #3
      I would recommend going with the 1.47 ratio. I don't think you will see much difference in WOT RPM or top speed.

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      • #4
        Thanks for that! Just rang up and placed my order - friendly service :)
        Looking forward to getting my old boat back on the water.

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