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  1. Replies
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    Exhaust hub on the 17" creates a low pressure...

    Exhaust hub on the 17" creates a low pressure area behind the prop pulling water down from the surface possibly uncovering your blades. Suggest you drop down on the transom a bit and see if that...
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    Re: quincy exhaust cover

    Believe the item pre-dated the 20H and was originally marketed to the KG7H user. Complete and partial examples of this item show up on Ebay on a fairly regular basis. If noise police inhabit your...
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    Re: 6 Cyl Merc

    Small 6 cyl Mercs had two different crankshafts. The early motor, MK75/78 had a crank based the original prototype tuning, in effect Three 2 cyl cranks. The later Merc 800/850 cranks had a different...
  4. Thread: Craig Craft

    by Ed Hatch
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    7,008

    Re: Craig craft

    Seem to remember a hollow transom with holes drilled at the top facing the inside of the boat and a bunch of corresponding holes drilled along the outside lower edge of the transom about an inch up...
  5. Re: Need history of outboard racing

    My Boatsport.org website will give you a good idea of outboard racing in the 1950's.

    The success of racing in the 1950's was a combination a strong economy, the easy availability of race motors,...
  6. Thread: sst60 tuner

    by Ed Hatch
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    Re: SST60 tuner dimensions

    The tuner measures 2 3/8" by 2 3/8" inside dimensions at the outlet and 1 1/2" by 1 3/4" up top.
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    Re; Material selection

    Check out this link

    http://www.hainesengineering.com/rhaines/sitka.htm
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    Re: D Uitility"ish" 16 ft plans

    If you go to Boatsport.org there are PDF files of most of Hal Kelly's raceboat designs. You can download the PDF files of any design, take it to a commercial printer and have him scale up the full...
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    Re: 45SS gearcase

    I believe the 45SS gearcase has the same bolt pattern as the generic 56 cube towers. With a stub driveshaft, a coupler, a cut down stock driveshaft and a modified water tube would be required to...
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    Transom height????

    From the photo of your boat it appears that you are running a stock height tower. The Bass unit and other racing towers typically are much shorter so you'll need to cut down your transom to around 10...
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    A pretty common practice on the mercury blind...

    A pretty common practice on the mercury blind bore motors, big gain is another story, rather part of a combination of mods, port timing, open exhaust etc. If done poorly you've ruined your block as...
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    RE: Q = Is porting the place to start?"

    Wouldn't it make more sense to get beyond the CDI rev limitation first before opening up the engine? If you can't resolve the RPM limit issue ther is no point in cutting up the engine.

    Have you...
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    Ricer question

    Not familiar with rice motors, if you have a tower with the 56 cube bolt pattern why not take advantage of the SST60, if you have to come up with a tower then there is no real advantage going OMC.
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    Re: afterthought

    For the effort and $$$ you'll need to fiddle with that 56 cube block you might find it easier to pick up an SST60 powerhead, it is 56 cubes, puts out around 90 plus HP and parts are still available...
  15. Thread: McCrea hydros

    by Ed Hatch
    Replies
    24
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    13,263

    Throttle hookup for your Merc 300

    There are two sources of the throttle hookup you need for your 4 Cyl Merc. Check Ebay item number: 270297360692. This is sold by Mike Downing, a reliable Ebay seller.

    There also is a fellow by...
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    Re: I need some help

    There was two Quicksilver tower heights. The Q is the earlier and taller version and Merc changed over to the H in 1953.


    There was also two skeg configurations, the original earlier version had...
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    There is a special tuner that goes with the...

    There is a special tuner that goes with the SST60. I have to guess that some of the performance is due to the tuner. Went to the local OMC and they wanted $500 some odd dollars for the tuner.
    ...
  18. Thread: V4 75 Hp

    by Ed Hatch
    Replies
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    8,735

    v4 75HP question/ give it a pass

    Your V4 weighs an awful lot for a 13 ft boat (C-D version of the Mad-Cap is 13' ). Finding high pitch OMC props will be difficult. There is no point in spending $$$$ opening up the intake side of any...
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    Gas tank question

    There are 231 cubic inches in a gallon.
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