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Thread: getting more hp out of a 59ci merc????

  1. #1
    Team Member fs5's Avatar
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    Default getting more hp out of a 59ci merc????

    just after some info on what you can do to the 59ci mercs .
    i seen a lot of you guys are running the 40hp's on tinny's over there in the states .
    i run a 55 seapro (pretty much same as a 60hp) on a slt boat over here.
    the motors pulled apart at the moment and getting rebuilt and while its apart i wouldn't mind seeing if i can get a few more hp's out of it.
    any thoughts??
    i have heard of guys building tuners and porting the reed blocks???
    since they don't have heads ,dose shaving some off the crank case help???
    have heard it works on the mercs..

    any help appreciated

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    FFX-61
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    dose shaving some off the crank case help???
    no

    you can put a bevel on the exhaust port, you can flute the piston crown in front
    of the intake ports. or you can pull the sleeves and replace with ones with a higher port map. not the best one to start with, but if thats what you got

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052

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    Team Member genea01's Avatar
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    Default pic

    can take a pic of ur motor and put it on here never seen a 55 sea pro

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    Team Member fs5's Avatar
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    here's a pic
    Attached Images Attached Images  

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    Team Member genea01's Avatar
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    Default nice

    do you have a side pic, and how fast and rpm's are you running on that boat looks like fun.

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    Team Member fs5's Avatar
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    Quote Originally Posted by genea01 View Post
    do you have a side pic, and how fast and rpm's are you running on that boat looks like fun.
    nah gene ,i don't have a side pic .have few of different trim and engine heights.
    the prop i have at the moment measures 21.35p and is 11 d .it turns anywhere from 5400 to 5900 depend on how the water is and what mood i'm in.
    heres a vid, it runs low to mid 60's
    http://www.youtube.com/watch?v=nZD8SHnl-7M

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    FFX-61
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    jack it up! till the prop shaft is even with the speed toob valve center.

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052

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    Team Member fs5's Avatar
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    Quote Originally Posted by Fast Fred View Post
    jack it up! till the prop shaft is even with the speed toob valve center.
    thats a pic of when i first set it up .the motor sits about 50mm off the transom now.it stops sucking water if i hold flatout for too long .

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    srg part timer 50hptiller's Avatar
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    nice video, u got a low water pickup? what year is you motor? gear ratio? 3 holer? it sure looks a lot diff than our 59's, that y i am askin the dumb ?'s

  10. #10
    Team Member fs5's Avatar
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    no low water pickup .
    the old girls a 2000 model and apperently was still pretty smick inside after i turned it upside down.
    its a 3cyl and runs the same 1.64 to 1 ratio as the 60 mers do
    theres no dumb question mate when it comes to talkin about boats ,i reckon i could chew anyones ear off

    mate i just watched your vid in your sig,you wanna swap !!

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