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  1. #11
    Platinum Member Platinum Member mcollinstn's Avatar
    My Boats:
    1991 F311SR1
    Join Date
    Sep 2001
    Remember the little "beeper" that sounded on the early RX7's when you grossly overrevved it. We called it "the pull over and put the fanbelts back on" noise.

    And what a cool little miniature Hitachi 4-barrel carb...
    I see London, I see France...

  2. #12
    Mike J
    A few years ago at Team Scarab
    Skunk works in Ventura CA. We had a project with Mazda and
    rotory eng. to develop a motor
    and install it in a Scarab 16ft Jet Sprint.
    A lot of R&D work went on in
    the ventura area during to
    late 80s and thru mid 90s of
    all kinds of boat designs.
    The Rotory Motor was just one
    of 14 motors tested in the
    same 16ft JetBoat, I still own
    that 1st boat.
    Mike J.

  3. #13
    Registered robyw1's Avatar
    My Boats:
    1998 Wellcraft 22' Scarab
    Join Date
    Jul 2003
    Spring, TX
    Not enough torque for practical use. You would need many very large rotary’s to power an offshore boat. Not to mention they don't take kindly to detonation.


  4. #14
    Platinum Member Platinum Member rainmn's Avatar
    Join Date
    Feb 2001
    Manahawkin, NJ
    Originally posted by mcollinstn
    Remember the little "beeper" that sounded on the early RX7's when you grossly overrevved it. We called it "the pull over and put the fanbelts back on" noise.

    And what a cool little miniature Hitachi 4-barrel carb...
    I remember it well. My father bought one new when I was 17. It took me about 3 days to hear that "Beeper." About 3 years later, my Dad was telling me about getting pissed off at someone in traffic, and he heard this "Beep" when he redlined the car passing the idiot. First time he ever heard it. Any idea how hard it was for me to keep a straight face?

  5. #15
    Gone Fishin' Charter Member Waterfoul's Avatar
    My Boats:
    1988 Tracker Pro 17, 40 hp Mariner.....1972 Glastron GT 140, Merc 50 power!!!
    Join Date
    Nov 2000
    Grand Rapids/Holland/Grand Haven
    There are some guys around here who run rotaries in their sand rails. Twin turbo charged, over 400 hp, and two guys can lift it into the frame without a cherry picker!! I was at Baker Engineering one afternoon a while back and they had one of these sitting on the floor. Pretty cool motor, really small, and according to him, really loud!! But he said the rail it went in was wicked fast.

    [b]M Go Blue.......Gator boots, gator luggage, gator purses... all at cut rate deals!!!!

  6. #16
    GLH is offline
    Platinum Member Platinum Member GLH's Avatar
    My Boats:
    Join Date
    Dec 2002
    Burlington, VT
    Originally posted by mcollinstn
    ...We called it "the pull over and put the fanbelts back on" noise.

  7. #17
    Registered JUSTONCE's Avatar
    My Boats:
    Join Date
    Oct 2002
    tropical Cleveland OH
    I'm with mroffshore, They can take a beating but rotaries with turbos are a totally different beast. They respond unbelievably well to boost but do not hold up. personally I think the n/a 13b has a wider torque curve than a comparable 4 cyl. I think if you ran a dry exhaust though the sound would drive you nuts.

  8. #18
    My Boats:
    1984 Chris Cat
    Join Date
    Jul 2002
    Troy, Mich

    General Motors tried it:

    Back in the days when GM was trying wankel (rotary) engines (mid 70's) before they abandoned them, they had a custom built Donzi 28 CC with two 4 rotor wankels tied to Mercruiser outdrives. The thing went like stink, the motors took up hardly any room, and used about the same amount of gas as v8's. I know, I drove the boat.

    Then GM scrapped the wankel program and EVERY motor that was built was pulled in and scrapped. There may be one surviving block somewhere in Warren, mich.

    They replaced the rotaries with twin Merc 188's based off of the 302 Ford v8. They had to increase the size of the engine cover hatch, lost 10 mph top speed (weight), and the 188's were a DOG of an engine (no response).

    The boat was named the "pflueger fun", Pflueger made fishing tackle.

    Rotaries are light weight and have great power/weight ratios. They are dirty from an emmissions standpoint and that's what killed them from the Automotive market. Mazda only produces the RX8 for it's unique marketing of the wankel. They are not practical and are expensive with the emmission requirements of today. Otherwise everyone would be building them.

    The Wankel has the ability to be marinized and I think would be great in personal watercraft and lighter smaller boats. You can tune them to make the all the power that would be needed at 6000 rpm or less.

    Wannabe in Motor City
    (OSO's peudo automotive historian)

  9. #19
    Registered PhantomChaos's Avatar
    My Boats:
    Formula FASTech 382 Sunseeker Apache 45
    Join Date
    Dec 2000
    Bell Canyon, CA
    WOW.......some great info guys!

  10. #20
    JC Performance Engines Gold Member Stormrider's Avatar
    My Boats:
    2003 28 Pantera
    Join Date
    Jul 2002
    Long Island, NY
    Puder is correct. The company is Rotary Power International. I posted this site in the same subject from months ago. They have an engine that is 1000hp, its just that they stack the rotaries. The HP/ wt was very impressive. It will work in a boat. RPI has built them for military applications.
    Unfortunately their website is not up.
    Stock symbol is RPIN.
    With great power, comes great responsibility.

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