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Thread: OMC’s 4-Rotor Wankel Racing Engine - The Real Story

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    Sam Cullis Mark75H's Avatar
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    Quote Originally Posted by Powerabout View Post
    My big question to John if he can answer is
    Back in 100 cu days why wasn't a V6 made using 49cu stuff?
    I think that would be a better question for Jim Nerstrom
    Since 1925, about 150 different racing outboards have been made.

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    Quote Originally Posted by Powerabout View Post
    My big question to John if he can answer is
    Back in 100 cu days why wasn't a V6 made using 49cu stuff?
    The first showing of the V-6 was at Paris in 1973; Johnnie Sanders won the race with that engine. It was actually made from 100cu V-4 parts with a new block and head castings resulting in 150ci. The crank was actually made from 2 V-4 cranks welded together. OMC got a copy of the Merc V-6 and knew it was a 122cu looper with a 60 degree V. It was a HP race. OMC knew they would get more HP out of 150ci than Merc could from 122. Also the 60 degree V from Merc wouldn't allow a bigger bore, so OMC thought they had won the HP race. Be sides, OMC had all the machinery to machine the V where as the 49ci was inline.

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    Quote Originally Posted by Skoontz View Post
    I don't know what i am looking at in regards to 6HP powerheads, but I do know that is a belt driven torque converter as used in a snowmobile in the flywheel of the first motor. Are you sure these are outboards and not something that maybe was not intended for Cushman carts or Lawnboy mowers? The taper on op of the flywheel without the clutch is used for a belt as well.....The snowmobiles had fins over the end of the housing.
    Guys. The picture of the engine horizontal is correct. It shows the snowmobile engines as they were produced on the assembly line at Evinrude in Milkwauke. The flywheel was one half of varriable sheeve pully used for the drive; an OMC patent. The posting Ken had before with the colored slide shows the prototype 6 HP outboard. It got put in with the snowmobile engine with the wrong orientation that was taged 6 HP outboard.

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    Quote Originally Posted by Powerabout View Post
    Thanks guys, I think you got it.

    Lars
    I agree, I always asked why they didnt make Jet ski's as they will be big soon after seeing Kawasaki 440's start to turned up to our marina in Oz in the late 70's.
    Both Merc and OMC said there was no market and they will be banned soon?
    I think OMC felt the jet ski market world go the same way as the S/N market. They had already lost a ton of money in S/N and didn't want to repeat that. Remember in 1969 there were 113 manufacures of S/N's. By 1975 there was 3.

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    Default 6 HP outboard picture

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    Sam Cullis Mark75H's Avatar
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    Quote Originally Posted by Rotary John View Post
    I think OMC felt the jet ski market world go the same way as the S/N market. They had already lost a ton of money in S/N and didn't want to repeat that. Remember in 1969 there were 113 manufacures of S/N's. By 1975 there was 3.
    Its also possible that they knew they could not compete on price if the imports were being subsidized and "dumped" into our market
    Since 1925, about 150 different racing outboards have been made.

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    Quote Originally Posted by Mark75H View Post
    Its also possible that they knew they could not compete on price if the imports were being subsidized and "dumped" into our market
    I think they had that problem with all the products they were involved with.
    I wonder why Kawasaki dropped out?

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    Quote Originally Posted by Powerabout View Post
    I think they had that problem with all the products they were involved with.
    I wonder why Kawasaki dropped out?
    The Yickifigions were entering the US market with everything from steel to cars to bikes and selling them dirt cheap to break the market. It made no sense that we could ship iron ore and taconite rigth past the steel cities we had on the great lakes, then to Japan to mill it, and ship back CHEAPER than we could do the whole job here.....Some blame the unions, but there was way they could have that much of a price drop without getting funny on price.....

    I also remember OMC to have a 6 wheel drive, cable steer ATV about 1968, and i think they went dead on theirs about 1971...
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    Team Member Bill Gohr's Avatar
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    Quote Originally Posted by Rotary John View Post
    I think OMC felt the jet ski market world go the same way as the S/N market. They had already lost a ton of money in S/N and didn't want to repeat that. Remember in 1969 there were 113 manufacures of S/N's. By 1975 there was 3.

    The ATV's, the trackster's there are still some runnig around here, I think Gary Johnson has one, across the street from me they cleared 20 acres to build a school, they found one out in the shrubs we pulled it out.

    As far as Jet Skis, OMC didn't get in the Jet skis, However, they were going to get into the personal watercraft market. We had prototype hulls and I built the two prototype engines, they were 56cubers laid on their face with BN carbs on them, they were gonna be marketed as the "Shockwave" this was like in 93',94', but they never made it to market

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    Quote Originally Posted by Skoontz View Post
    The Yickifigions were entering the US market with everything from steel to cars to bikes and selling them dirt cheap to break the market. It made no sense that we could ship iron ore and taconite rigth past the steel cities we had on the great lakes, then to Japan to mill it, and ship back CHEAPER than we could do the whole job here.....Some blame the unions, but there was way they could have that much of a price drop without getting funny on price.....

    I also remember OMC to have a 6 wheel drive, cable steer ATV about 1968, and i think they went dead on theirs about 1971...
    The vehicle had 2 S/N tracks, not 6 wheels. It also had a very sloped front end ala a tank so it could climb over obstacles. It was made by Cushman, an OMC company at the time. They got out of that business due to a law suit where a doctor going down hill decided to throw it in reverse and the whole vehicle and doctor went *** over tea kettle, killing said doctor. His wife sued and won a ton of money for bad design and failure to warn ??? An interesting side bite; Ralph Evinrude got one of the first units and took it to his Fl home. He took it out in the front yard and had a ball spinning cookies etc. The result was a new sod job for his front lawn. Francis Langford, his wife, was incensed and the vehicle went back to Cushman.

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