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Thread: Omc Ft-10s

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    Default Omc Ft-10s

    I am looking for any info on these OMC race engines such as photos, tech info or specs sheets. I have most of the parts for one of these and I think I am going to put it together in as close to the original configuration as possible.
    For those not familiar, FT-10S is the designation for the 3 cylinder, 49.7 ci motor that was approved for the UIM SE class around 1968. A special mid with linkage on the side was used to adapt the 14:23 GT115 type lower unit. Pictures of the hood graphics, dressed powerhead or shift linkage would be especially helpful.

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    Sam Cullis Mark75H's Avatar
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    Hope this is helpful.

    Last edited by Mark75H; 03-17-2010 at 08:12 PM.
    Since 1925, about 150 different racing outboards have been made.


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    Burgess/Evinrude F1 V8 Lars Strom's Avatar
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    Default Ft 10 S

    Hi Brichter,

    I use to own one..a Johnson..More or less a stock 1968 55hp power head
    on a special mid section.
    X/GT 115 hp gear case and the shifter on the side of the mid section..

    Ft 10 S used the standard transom brackets and no power trim..

    1973 OMC came out with a better one..Named 65 SS

    A modified stock 65 hp power head..different cylinder head and exhaust ports..

    Same mid section, gear case but factory power trim from V-4 racing..

    I won the 1973 European SE Champion ship with that engine..

    Maybe have some better photos..
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    Lars Strom

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    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

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    Burgess/Evinrude F1 V8 Lars Strom's Avatar
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    Default FT 10 S gear case

    This is my 1973 lower unit, but FT 10S look the same..
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    Lars Strom

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    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

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    Burgess/Evinrude F1 V8 Lars Strom's Avatar
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    Hi again..

    On the right side of this photo you can see a FT 10 S mid section..

    Repainted in Johnson Stinger colors..

    Regards

    Lars
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    Lars Strom

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    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

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    Thank you for posting those Sam and Lars!


    Lars,When you say the standard stern brackets do you mean the aluminum type used on the service motors at that time (like the orange mid in the picture)? My mid has that same type but I am not sure if the FT used those or the steel GT115 type bracket.
    Stock 55 hp powerhead is what I figured was used. Do you remember if a flex flywheel was used on the ft10 s?
    Thaks again!
    Bill

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    Sam Cullis Mark75H's Avatar
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    Line 6 c

    FT10 S flywheel ... 7 pounds 11 ounces ... if that's what a stock flywheel weighs ... I'd bet the FT10S flywheel is not a flex
    Since 1925, about 150 different racing outboards have been made.


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    Quote Originally Posted by Mark75H View Post
    Line 6 c

    FT10 S flywheel ... 7 pounds 11 ounces ... if that's what a stock flywheel weighs ... I'd bet the FT10S flywheel is not a flex
    My buddy H Tinscher and myself raced what must have been the first FT10S in Germany.
    Flywheel was a cast (potentially press-formed) massive aluminium affair. They appear occasionally on ebay. That heavyness led to accelerated wear of the top crank bearing and leakage through the seal there, disabling the ignition. The transom items were cast steel, otherwise the cross-bolt threads would not live long enough. I remember them being heavy when I installed them. Transom thru-bolts however were some super-duper high-strength aluminium alloy. Titanium wasn`t in use at that time yet (except as con-rods in the Porsche race engines). Powerhead was indeed stock 55hp. We took 1mm off the cylinder head, removed the airbox and fitted little handmade brass stacks to the carbs (imitating the Carnitis). We slotted the cowling to the left and right of the carbs and rejetted. Underneath the two rear mounting bolts of the lu, the exhaust housing was cross-drilled, 13mm dia. Engine would pull best at about 7200 rpm. We had four ss props made in Sweden (SB Man AB I think it was), after seeing them used by those Scandinavians who raced the NSU Wankels in 2ltr inboard. Fantastic props at 60% the price of the Radices. If my memory serves me right, the props were pitched 17 and 18". Three-bladers worked best, four blader was disappointing, might have needed more work.
    A year or so later(`69), the German Johnson distributor (Dr. OE Hesse) gave us a fresh engine from Bruges, which enabled us to win that year`s Liege and Berlin 6-hour races, with a heavy Dalla Pieta` winged Vee-bottom (which he also paid for). A 65ltr tank would last us 1 1/2 hours. Great engines. Pity I don`t live in the US - might be tempted to race Mod-E with the 3-banger.

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    Burgess/Evinrude F1 V8 Lars Strom's Avatar
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    Quote Originally Posted by brichter View Post
    Thank you for posting those Sam and Lars!


    Lars,When you say the standard stern brackets do you mean the aluminum type used on the service motors at that time (like the orange mid in the picture)? My mid has that same type but I am not sure if the FT used those or the steel GT115 type bracket.
    Stock 55 hp powerhead is what I figured was used. Do you remember if a flex flywheel was used on the ft10 s?
    Thaks again!
    Bill
    Hi again,

    Standard aluminum stern brackets..same as the 75 short shaft (15 inch)
    motor.

    The flywheel was stock and a weakness was the two breaker points under the
    flywheel..needed cleaning and service often.

    1968 was the first year of the 3 cylinder looper and I think OMC made a mistake using the X/GT 115 gear case..took away to many horses just to turn around..

    Same problem with my 65SS 1973..
    The year after.. (1974) the same power head with standard mid section and the new Nitro gear case made my SE boat 15+ MPH faster..
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    Lars Strom

    Life is good





    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

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    Burgess/Evinrude F1 V8 Lars Strom's Avatar
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    Please, check my Racing stories..many pages about Evinrude 3 cylinder
    racing..



    http://www.boatracingfacts.com/forum...ead.php?t=6727
    Lars Strom

    Life is good





    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

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