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  1. #46
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    Quote Originally Posted by Mark75H View Post
    I think the first thru hub OMC was 1928; that is where the patent would have been. Even 20 years of patent protection would have expired in 1948. Both companies claimed different patents on their 1960's prop flairs ... Merc props just had a bell, OMC's had the reverse NACA style flow ring.

    Merc's first thru prop was 1960, OMC brought it back on the triple in '68

    At first the 49 ci OMC looper triple was an absolute class killer over the smaller 1940's descended 44 ci Merc 50hp deflector. Before it came out Merc had had the E classes to itself from the beginning of OPC. I really think the 55 hp designation of the Triumph was a gross under rating to put it close to the Merc in the public's eyes.

    The Merc 650XS cheater motor was competitive with stock 75's, later Mod50 OMC's beat it easily. It see-sawed back and forth. People seem to remember how in ended rather than the whole story.
    ...bringing a good thread forward...

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  3. #47
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    The Merc 650XS was never intended to go against a MOD 50. The 650XS had a stock F-N-R gearcase.
    The Merc 650X that later became the 700X was the MOD 50 engine with a small Speedmaster gear case and totally different tower housing.

    I absolutely loved my "cheater motor" 650XS that was a totally legal FE/SE motor everywhere but APBA.
    In Canada we had great OMC - Merc head to head FE/SE competition for many years because of the 650XS.

    Click image for larger version. 

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  5. #48
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    funny how the f1 race was xflow omc v Merc looper and F3 FE etc was the other way around

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  7. #49
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  8. #50
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  9. #51
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  11. #52
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  13. #53
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    The original 3 cylinder OMC engine were not lost foam. That didn't happen till the very late '70's or early '80's. The loop transfer ports were formed into the cast iron liner and then high pressure die cast into the block.

  14. #54
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    Quote Originally Posted by Rotary John View Post
    The original 3 cylinder OMC engine were not lost foam. That didn't happen till the very late '70's or early '80's. The loop transfer ports were formed into the cast iron liner and then high pressure die cast into the block.
    Lost foam wasnt used on the triple till the 56ci 86 ish

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  16. #55
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    Quote Originally Posted by Mark75H View Post


    The Merc 650XS cheater motor was competitive with stock 75's, later Mod50 OMC's beat it easily. It see-sawed back and forth. People seem to remember how in ended rather than the whole story.
    Well..I remember when the Merc 650XS came out 1975 and it did not keep up with the stock OMC 75 if the OMC was rigged and run correct.
    Here is the story from Finland and the debut of the 650XS in the UIM SE class. I raced the UIM SE class many years and was never behind the Merc 650XS at the finish line.

    The Scandinavian UIM SE Championship 1975 took place in Forsaa, Finland.


    Around 25 boats were in place at this beautiful Lake, and Mercury had just released the new 650 XS UIM SE race engine and lots of people was hoping the new Merc could give the OMC drivers a run for the money.

    Driver Bo Nilson (6) was backed up by AGB, the Swedish distributor for Johnson and I by Huzells, the Swedish distributor for Evinrude. (1)
    The strongest Finn was Mercury’s Bimbo Aminoff and a few more drivers from Denmark
    and Norway with the new Merc.
    The rest was using OMC 3 Cyl. 75 Hp. Four heat and three counts as normally and a clock start.
    I did not know how strong the new Merc was, but I was very well prepared and after
    the first heat the good news was that the new Merc was no match (sorry
    Mercury) and the fight was as usually between Bo (6) and me (1) and some other OMC
    drivers.
    In the second heat Bimbo Aminoff took the lead but after a few laps I past him and so did Bo but I made a mistake in one turn and Bo past me
    for the win.
    Well, I do not remember exactly but it came down to the last
    heat and the winner of that heat was the overall winner of the race and I was
    the lucky one again with only to tens of a second over Bo Nilsson, and I was now
    the Scandinavian Champion for the third consecutive year.
    Well not yet, because third was Mercury’s Bimbo Aminoff and he filed a protest.
    Bo and I did not have any spray paint on our gear cases.
    You where allowed to sharpen the skeg, and sand on the gear case if you still was within the template.

    We pass that test easy, but the Chief technical inspector said that you must spray paint the gear case, and ours was just polished aluminum
    so he disqualified Bo and me.
    Bimbo Aminoff was now declared the winner and Bo Nilsson went nuts.
    I know how angry he can get, and it turned ugly. After a major argument we left for Sweden and straight to Roland Rosenholtz, the Swedish Power Boat Federations chairman to tell him the
    story, but he was already informed.
    Mr. Rosenholtz made a few phone calls to Finland and UIM.
    "There was nothing in the UIM rule book saying the gearcase must be painted/or not painted"
    After a few days I received the Trophy and the price money
    from Finland and I was officially the Scandinavian Champion 1975.
    Thank you Roland Rosenholtz

    http://svera.se/blogg/racing-historier/disqualified/



    Attached Thumbnails Attached Thumbnails Jag-och-Bosse-19751.jpg   Erwin-and-Strömming.jpg  
    Last edited by lars strom; 06-24-2019 at 12:49 PM.

  17. #56
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    so who was the UIM inspector?

  18. #57
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    Quote Originally Posted by powerabout View Post
    so who was the UIM inspector?
    Don't remember, probably a local guy from Finland.

  19. #58
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    I spray painted the gearcase back in Swedenand lapped the Merc 650XS the next race.
    Remember Paul Kalb from OMC racing in Belgium called me and said..
    Lars..paint the f*cking gearcase before next race....the problem was the paint alway came loose and it looked ugly.

  20. #59
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    We could beat the original 55hp OMCs with a 500 most of the time. They had a much bigger lower unit, they were heavier and they were electric start so they had to carry a battery. These factors kept the manual start 50s competitive. Once they upped the horse power and changed to a better lower unit that was it.

  21. #60
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    Strang probably wanted to build more loop engines back then. The bean counters probably said retooling the entire line costs too much.
    1970 15' Allison/135 Chrysler stacker
    RC Mod-VP Boats

    IMPBA District 13
    NAMBA District 3

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