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  1. #1
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    Converting 20 inch opti to counter rotating

    I have twin 20 inch Mercury Optimax engines on my boat , Mercury does not make a 20 counter rotating lower unit.
    How would you proceed in converting one ? Is changing the driveshaft of a 25 inch counter rotating to a 20 inch an option ?
    The boat is a 1982 Boston Whaler 25 ,twin 2007 Mercury 150 Optimax engines. Ran this boat with this setup for a year only trouble is a port turn at speed the boat doesn't lean into the corner, quite uncomfortable.
    Thanks
    Last edited by JMM; 01-12-2012 at 06:01 PM.

  2. #2
    Join Date
    Jun 2004
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    port st. lucie, fl
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    you can change the driveshaft but you must ck the pinion height(shimming). you could also buy an sei gearcase that is done already as well
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  3. #3
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    SEI does not offer counter rotating gear cases , that was my 1st thought they said they are hopeful to offer some in the future.

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