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  1. #16
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    Uxbridge Ontario Canada
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    OMC 3s

    One of my favorite motors. I have a few of these:

    1969 Johnson 55 hp short shaft
    1973 Johnson 65 hp long shaft
    1975 Evinrude 75 hp Hustler short shaft

    It really is too bad these motors have been droped. Just about everyone at one time or another owned one of these motors.

    My experiences with these have been:

    They run best "pinned"
    They will run forever DO NOT FORGET THE OIL
    Not bad on fuel
    They will need a head gasket every 10 years or so.
    A coil and power pack now and then
    Will run like a watch when properly tunned

    I do know where there is a new 2001 70 in the box HMMMMMMMMMMMM!
    Sean, 19 J-Craft ,225 Johnson
    If everything seems to be going well,you have obviously overlooked something

  2. #17
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    Austin, Texas
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    Site 6

    Sam: I can remember us going to a race at someplace called "Site 6" Don't remember the details but the name struck a cord. Also some other location on the Colorado at Bullhead City. They had something called a "Wild Burro Bar-B-Que" and a boat race to go with it..
    Remember that one as the first time my dad thougth I was old enough to go for a
    ride in one of the race boats. Good times
    spent with family and freinds.
    Danny Leger
    Originally posted by Mark75H
    Correct. The race there was to attract attention to the development. This was not lost on the folks at Salton City. The real estate developers were the main sponsors at both locations.

  3. #18
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    Apr 2001
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    Northern Ill
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    OMC triples

    The 68 55hp was the first with domed pistons and a real unique head design that was used till 73. In 70 they came out with the 60hp which had the 3rd intake port. In 72 they came out with the 65hp which had a whole new exhaust area and ignition. All these were still electric shift. (don't know how it resembled a Merc) 73 was the same as 72 but had hydro mechanical G/C. 74 was a 70hp with new porting, flat top pistons and head which looks just like a 2.5. 75 they added the 75hp which was the same as a 70 with higher exhaust ports. This all stayed the pretty much the same except gearcases and trim till 86 when they went to 56 cu.in.

    Someone posted that their 3 cyl looked more like their Merc V-6. Hmmm, could that be because the OMC looper came first? Let me think, loop charged engine, flat top pistons, muffin style cylinder head. Na forget I said anything.

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  5. #19
    Join Date
    Apr 2001
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    Monroe North Carolina
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    Omc Triple

    The best engine omc made is right. I've had mine for 27 years.
    If I didn't make so many parts for Mercury at work, there would be an Omc on the back of my Euro.
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    M Hurst
    1976 Hydrostream Vixen, 1976 75 Evinrude
    North Canton, Ohio

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  7. #20
    Join Date
    Apr 2001
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    Northern Ill
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    Thats

    one of my favs, 76 75hp Evvy

  8. #21
    Join Date
    May 2001
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    KC, MO
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    Back to the Top...A great thread and a great engine.
    I wish Beaver (omc v-4) was still around, he loved the motors too.
    Jason
    Outboard Junkie


  9. #22
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    Those were a good ol' motor. About that time, OMC won it's long-running infringement lawsuit against Merc for the thru-hub exhaust system. The new 55's had a decal on the back by the idle relief port that said " Thru-hub exhaust - OMC Patent number xxxxxxxx " or something to that effect. It was done to tweak the noses of the Merc crowd.

  10. #23
    Join Date
    Jul 2007
    Location
    Upper East Tennessee
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    I have a soft spot for the 3 cyl Johnson. I had a 60hp that I ran every summer for 15 years, all it ever did was pick up a slalom skier, run wide open, drop one, pick up another. Tough motor.
    OK, I got down off the porch and ran with the big dogs....kinda sore now....think I'll just lay here in the flowerbed for a while...


    1976 Hydrodyne 18 I-O
    1969 Allison 15R, 1973 Merc 1500 (project)
    1995 Harris toon



  11. #24
    Join Date
    Aug 2001
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    Annapolis, MD ragboat capital of the world
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    Quote Originally Posted by seahorse View Post
    Those were a good ol' motor. About that time, OMC won it's long-running infringement lawsuit against Merc for the thru-hub exhaust system. The new 55's had a decal on the back by the idle relief port that said " Thru-hub exhaust - OMC Patent number xxxxxxxx " or something to that effect. It was done to tweak the noses of the Merc crowd.
    The patent was long since expired before Merc started doing it, but it was an excellent tweek.
    Last edited by Mark75H; 05-22-2009 at 05:10 PM.

  12. #25
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    Moncks Corner SC
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    Omc

    Sam, what was the first yr, OMC had thur hub ex. an first yr. merc had it. I have 5 3cyl. OMC's most Stingers an would not let any of them go. This is the only OMC motor Merc could not compete with. They ruled SE an FE in APBA.

  13. #26
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    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.

  14. #27
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    North Bay, Parry Sound
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    1957 Mark 10

    Sam,
    The first Merc with Jet prop - "thro hub exhaust" was released in 1957, the Mark 10. Also the first with the gear shift in the twist grip throttle.
    I am sure I saw an picture of a KH7 type engine with a jet prop in old mercury literature - jumping.
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  15. #28
    Join Date
    May 2001
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    Belfair, WA
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    No question that the 3 cylinder JohnRude was the best engine they ever built...and perhaps the best outboard ever built.
    I had a 16ft. Lowe John Boat that I put a 1968 3 cyl 55hp short shaft on...what a blast...I had a transom jack, ran the engine with a tiller, but used the 3 button electric shift control to run the throttle. It ran awesome...I had hydraulic trim tabs and ran a 21 pitch Black OMC SST prop. The boat would stay on plane at about 1200 rpm and you could run in less than a foot of water. It ran about 45 mph top end....sipped gas and was rock solid dependable. (the transom finally cracked out under the stress...I think the hull was rated for max 25-30hp)
    Too bad OMC put VRO on those engines......they were great up to then! (and all this coming from a die-hard Merc man)

  16. #29
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    Quote Originally Posted by mk30h View Post
    Sam,
    The first Merc with Jet prop - "thro hub exhaust" was released in 1957, the Mark 10. Also the first with the gear shift in the twist grip throttle.
    I am sure I saw an picture of a KH7 type engine with a jet prop in old mercury literature - jumping.
    You are right, I was thinking of the bigger top of the line motors.

  17. #30
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    It's too bad that OMC didn't build on the Triumph success by building an inline 4 looper or V4 looper back in the late 60's. They had the jump on Merc and would have really built up a strong lead in sales of a superior engine.
    I agree the 3 cly was the best motor they ever built beautiful lines too, especially with the short shaft.

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