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

  1. #191
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    Quote Originally Posted by Rotary John View Post
    If you are refering to the picture of the rotary passing the Merc, that is Barry Woods driving the rotary who co-piloted with Jimbo. The Merc driver is Billy Seebold. They lead the race for 5 1/2 hrs until engine failure caused by sabotoge.
    Thanks for clearing that up John.

  2. #192
    BoatRacingFacts VIP John Schubert T*A*R*T's Avatar
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    Default Message for Ken Finley

    Ken,

    I sent an e-mail to you through BRF about help that a fellow AOMCI member & friend is looking for. If you did not receive it, please e-mail me direct at jschubert@wi.rr.com so I can provide you with his contact info

    Thanks,
    John

  3. #193
    U.K. J 250 - Euro JT250 Techteam's Avatar
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    Quote Originally Posted by Rotary John View Post
    Looks like someone has stacked Mazda parts on top of a piece of plywood with OMC carbs bolted on. If you look close, the gearcase isn't connected to anything and a rotary has a crank in the center of the package which in this picture doesn't line up with the gearcase shaft.
    I know John single rotor Mazda........

  4. #194
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    Quote Originally Posted by Techteam View Post
    I know John single rotor Mazda........
    Come on, you'r supposed to be a rotary man. Those are a couple of Mazda parts stacked up for a picture. No crank, no ct. wt's. no work. Mazda never sold a single rotary, thus no crank and as you well know the cost of machining on from scratch is very costlyps: are you still working with Shaun Oken?

  5. #195
    U.K. J 250 - Euro JT250 Techteam's Avatar
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    That's why I said Single Rotor Mazda !! Maybe it's my british warped sense of humour that doesn't come across right. Shaun Oken there's a name to conjour with. It seems to be an ongoing sort of thing. As you know I just build them and poke them with a stick on the dyno. I think I need a bigger stick.

  6. #196
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    Quote Originally Posted by Techteam View Post
    That's why I said Single Rotor Mazda !! Maybe it's my british warped sense of humour that doesn't come across right. Shaun Oken there's a name to conjour with. It seems to be an ongoing sort of thing. As you know I just build them and poke them with a stick on the dyno. I think I need a bigger stick.
    Your from Windmere, can't be all bad. Get a BIGGER stick with Shaun and don't bend over.

  7. #197
    Preserving OMC Heritage LIQUID NIRVANA's Avatar
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    Quote Originally Posted by John Schubert T*A*R*T View Post
    Ken,

    I sent an e-mail to you through BRF about help that a fellow AOMCI member & friend is looking for. If you did not receive it, please e-mail me direct at jschubert@wi.rr.com so I can provide you with his contact info

    Thanks,
    John
    Thanks John. I received both emails and responded to George. Hope I can help.

    Ken
    liquidnirvana@y7mail.com

  8. #198
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    Default Single rotor Mazda

    Quote Originally Posted by Rotary John View Post
    Looks like someone has stacked Mazda parts on top of a piece of plywood with OMC carbs bolted on. If you look close, the gearcase isn't connected to anything and a rotary has a crank in the center of the package which in this picture doesn't line up with the gearcase shaft.
    Hello Rotary John and others.......

    That engine is a mockup of a Mazda 13B outboard project of mine. The tower and 45SS gearcase were used to set the 4 lap 3-mile 850cc mod hydro record at Dayton in 2010 and are very real. The "powerhead" with plywood adapter is centered within .060" of the driveshaft for mockup purposes only.

    With cast iron end housings the beast will weigh 196 lbs - too heavy for my 13' Ropp hydro. Target weight is 170 or less (my turbo 56 OMC weighs in at 166). With aluminum parts it comes in at 172 with no starter. Wonder if it can be hand roped with 9.7:1 compression???

    The single rotor crank ($1850 with balance weights), aluminum end plates ($2000 ea), and peripheral rotor housing (another $1200) are readily available. Plus a custom oil pan, hoses, macine work, carbs, intake, etc. The good news is a single rotor P-Port will reportedly deliver 150HP at 9000 RPM.

    The big issues are weight and expense for a toy that might run 4-5 hours in it's life. My turbo 56 is a blast, was built for half the $$$, and has an electric starter. Until I'm bored with the turbo and/or run into some mad $$$, I'll stick with the recip......

    Tim

    PS If any are interested, I'll post images of the 13B internals and post sources for the parts. Best to all.

  9. #199
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    Quote Originally Posted by Tim Kurcz View Post
    Hello Rotary John and others.......

    That engine is a mockup of a Mazda 13B outboard project of mine. The tower and 45SS gearcase were used to set the 4 lap 3-mile 850cc mod hydro record at Dayton in 2010 and are very real. The "powerhead" with plywood adapter is centered within .060" of the driveshaft for mockup purposes only.

    With cast iron end housings the beast will weigh 196 lbs - too heavy for my 13' Ropp hydro. Target weight is 170 or less (my turbo 56 OMC weighs in at 166). With aluminum parts it comes in at 172 with no starter. Wonder if it can be hand roped with 9.7:1 compression???

    The single rotor crank ($1850 with balance weights), aluminum end plates ($2000 ea), and peripheral rotor housing (another $1200) are readily available. Plus a custom oil pan, hoses, macine work, carbs, intake, etc. The good news is a single rotor P-Port will reportedly deliver 150HP at 9000 RPM.

    The big issues are weight and expense for a toy that might run 4-5 hours in it's life. My turbo 56 is a blast, was built for half the $$$, and has an electric starter. Until I'm bored with the turbo and/or run into some mad $$$, I'll stick with the recip......

    Tim

    PS If any are interested, I'll post images of the 13B internals and post sources for the parts. Best to all.
    There is an additional problem. The mazda engine has oil-cooled rotors. The oil is squirted from the crank into the inside of the rotor and then is collected in the center of the end housings and returned to the sump by gravity. When you lay the engine vertical, the oil return system may not work as intended. Unless the end housings are specificlly designed for this, it can cause a major problem. In addition the is an oil cooler in the system. I wouldn't plan on rope starting. Its not the compression, its the amount of rotation required.

  10. #200
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    Default Oil cooled rotor challenges

    Yes,

    Mazda rotors are oil cooled, and a cooler is required - all part of the plan. The good news is there are examples of vertical shaft conversions in operation, so the art is pre-existing.

    Once again, the issues are starting and bang for the buck. Much as I'd like to build the all-aluminum rotary, my OMC Turbo 56 satisfies the need for G's.

    Tim

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