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

  1. #81
    Team Member WharfRat's Avatar
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    great talikng to you yesterday Wayne!!

    I actually missed the Galveston race (& was really POed about it at the time) Although I remember getting a patch from it (think Tommy Hathaway brought it back to me) I do remember seeing one run but can't remember where it was but it had to have been on Clear Lake or Baytown even though it might have been just a test session & not a race, don't recall one at Conroe, but it is a possibility

  2. #82
    Team Member Master Oil Racing Team's Avatar
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    I still have the B&W photos from Clear Lake to post Scott. That might bring back some memories.

    Here is a column from Ann Strang in the June 1973 Propeller.

    Also, Ken...do you have the article on the Wankel from the February 1972 issue of Powerboat to post? If you don't have it let me know.
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  3. #83
    Team Member Master Oil Racing Team's Avatar
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    All of this stuff was in the July 1973 Propeller. The blip on Bob Wanamaker's Flying Quarter was from Ann Strangs column. She didn't mention the Rotary, the the Flying Quarter results show Evinrude RC, so I presume that is a rotary.
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    Preserving OMC Heritage LIQUID NIRVANA's Avatar
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    Wayne (Master Oil Racing Team), your posts are exceptional, your tenacity in bringing them to us, inspiring, and your love of taking the time to share, to collect, to photograph, to collate, to explain & most importantly (I say again) to share this wonderful sport with us is appreciated more than I can say. I also include, Sam Cullis (Mark75H) & Ron Hill for their time & passion together with many many others. Thank you for this place.
    Ken

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    Team Member Master Oil Racing Team's Avatar
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    Thanks Ken, but you have been an inspiration to me in your drive to put togther a quality all-things-OMC website. I feel fortunate to have raced in a time when boat advancements and rapid motor developements brought speeds up very quickly and when there were still many competitors and race sites. The Wankel was one of the most unique happenings of those days. I was glad to have seen what small part I did. For those who were not able to experience it, I applaud your efforts to make this thread the premier place to come to find out about the OMC Rotary Combustion engines.



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    Many thanks to John Sheldon aka 'ROTARY JOHN' on BRF for providing the above literature.

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    Quote Originally Posted by Mark75H View Post
    OK, more questions for John ... so, in the beginning there were 4 rotary motors made by stacking 2 snowmobile engines together. There were some motor failures and replacements were worked up. Were the replacement motors made completely from new parts or were existing motors repaired?
    The first engines were made from 2-2rotor water cooled engines. They had many snowmobile parts, but also many new parts. Engines were torn down after each race/outing/test and rebuilt with some used parts and some new parts, depending on there condition at teardown

    Quote Originally Posted by Mark75H View Post
    In the end 4 very advanced dedicated 4 rotor motors were put into storage ... were these motors that had been raced or new unraced motors?
    Mostly new. rotors were seldom replaced, but bearings & seals generally got replaced every teardown. Cranks only had a design life of 25 hrs, so they got replaced rater regularly, but not always.


    Quote Originally Posted by Mark75H View Post
    Did the dedicated 4 rotor motors weigh less than the doubled up snowmobile motors?
    Yes, because the huge center section used on the 2 rotor and first race engines were replaces by much smaller parts with bearings and the engine had 3 center hsgs rather than 2 and 2 additional end hsgs.
    Last edited by Mark75H; 05-25-2009 at 06:14 PM.

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    Quote Originally Posted by Mark75H View Post
    John, were you ever aware of the weight of these motors?
    The running powerhad with the 2-2 rotor cranks weighed 197 lbs, no gearcase bucket, shroud, etc. I don't remember how much the new cranks/hsg reduced weight.

  9. #89
    Sam Cullis Mark75H's Avatar
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    I would think the dedicated 4 rotor motors also benefited from being charge cooled rather than water cooled as the early snowmobile converted motors were.

    So as a guess the total weight of the original motors may have been 260 or so and the later motors ... 220 to 240, just as a guess?
    Since 1925, about 150 different racing outboards have been made.

  10. #90
    Team Member Master Oil Racing Team's Avatar
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    This is Ann Strang,s column from Propellor October 1973. In regard to Lynn having to fly back home because of Mike's accident, Bill called my Dad from Provo about Mike's accident. He drove a 4 X 4 or something like that off a small cliff or some bluff if I remember right. I was only around Mike a few times, but I recall him as a very rambunctious kid, and as most are at that age....very indestructable.
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