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  1. #1

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    OPS .67 nitro marine engines help

    I just received a boat that has twin OPS .67 nitro marine engines. I need to know what nitro percentage the beasts run, and if anyone has a manual that I could view that would be even better.

  2. #2
    HendricX's Avatar
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    RE: OPS .67 nitro marine engines help

    10 to 60% Nitro ... it's up to your wallet :-)

    With 20 > 30% you're in the ball-park.

    But be sure of MINIMUM 15% (12/3) oil .. (I prefer 18% (15/3) for bronze-bushed conrods)

    Even new OPS'es don't come with a manual ,

    so fire away here with all your questions.

  3. #3

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    RE: OPS .67 nitro marine engines help

    Thanks, how about cool power 30% heli fuel? It's 22% synthetic oil. Traxxas 33% is 16% oil. I stock both of these. Is 22% too much?

  4. #4

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    RE: OPS .67 nitro marine engines help

    DONT run the Traxxis for what ever reason i have lost two engines while running that fuel and i have been running nitro for 25 years in my larger marine engines i run 20% -30% nitro as there is noreason to go higher the heli fuel is ok but fuel with 16% -18% oil works best

  5. #5

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    RE: OPS .67 nitro marine engines help

    Thanks, I'll order up some O'Donnell 30% quarts. 17% oil. Thanks guys for your help.

  6. #6
    HendricX's Avatar
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    RE: OPS .67 nitro marine engines help

    O'Donnell-boat-fuel is 17% all synthetic ... I'm not fond of pure synthetics .. ,

    I prefer 2 > 3% Castor as a 'safe-guard' , that didn't hurt my engines in 50 years.

    On your side of the pond .. buy Klotz-BeNol and add 2%.

  7. #7

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    RE: OPS .67 nitro marine engines help

    You could order some 30% Grimracer fuel. That is 23% oil, full synthetic.

    I have used Omega 25% and 40% with good results. That is 17% oil with both caster and synthetic.
    Craig Mapstone, IMPBA #20305S, Stony Pond Model Boat Club
    2012 D1 20 Hydro Champion

  8. #8
    advanced builder's Avatar
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    RE: OPS .67 nitro marine engines help


    ORIGINAL: HendricX

    O'Donnell-boat-fuel is 17% all synthetic ... I'm not fond of pure synthetics .. ,

    I prefer 2 > 3% Castor as a 'safe-guard' , that didn't hurt my engines in 50 years.

    On your side of the pond .. buy Klotz-BeNol and add 2%.
    I add 2 shot glasses of that to 40 % nitro. Your bearing will last longer. If you have a club nearby then join you'll get club prices on fuel, plugs. You'll get some good help and meet some new Friends
    Stoney Pond Model Boat Club, Canandaigua, NY
    International racer
    http://neilsrcsite.shutterfly.com/

  9. #9

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    RE: OPS .67 nitro marine engines help

    Red Max 50=60% nitro if you are racing an OPS 21-80. Make sure you get MARINE fuel,car or plane fuel will make your rod disintegrate for sure. I'm everything OPSI love them for the money.

  10. #10

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    GotNitroOnline.com for all your OPS Marine engines and parts.

  11. #11
    Ron Olson's Avatar
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    Quote Originally Posted by rcguy1411 View Post
    DONT run the Traxxis for what ever reason i have lost two engines while running that fuel and i have been running nitro for 25 years in my larger marine engines i run 20% -30% nitro as there is noreason to go higher the heli fuel is ok but fuel with 16% -18% oil works best
    When Traxxas tells you not to run that fuel in a boat thne that has to tell you something.

    Neil. remind me not to do shots at your place!
    IMPBA 17238 S
    269 Racing Team

  12. #12

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    Quote Originally Posted by GNO4U View Post
    GotNitroOnline.com for all your OPS Marine engines and parts.
    Are the big square head .90 OPS engines still available?
    Craig Mapstone, IMPBA #20305S, Stony Pond Model Boat Club
    2012 D1 20 Hydro Champion

  13. #13

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    Yes they sure are do not have in stock but can get you one.

  14. #14

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    Quote Originally Posted by GNO4U View Post
    Yes they sure are do not have in stock but can get you one.
    Cool, don't need one now, but maybe in the future. What is the price? Thanks.
    Craig Mapstone, IMPBA #20305S, Stony Pond Model Boat Club
    2012 D1 20 Hydro Champion

  15. #15

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    Just the engine without pipe $689.00

  16. #16

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    Quote Originally Posted by GNO4U View Post
    Just the engine without pipe $689.00
    O.K., thanks.
    Craig Mapstone, IMPBA #20305S, Stony Pond Model Boat Club
    2012 D1 20 Hydro Champion


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