Oil to use?

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This topic contains 7 replies, has 7 voices, and was last updated by phil phil 5 days, 19 hours ago.

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    antczak

    Replies: 0
    Topics: 2
    #178577

    Hi Folks!!

    My old 1949 Evinrude 3.3 hp. sport twin calls for 40 wt. engine oil in the gas. Back in 1949 I’m sure that worked. But today with all the new oils for 2 cycle motors, what should I be mixing, and how much to one gallon? 24:1? 40:1? 50:1??

    Thanks!!
    Jeff………………….

    labrador-guy
    labrador-guy
    US Member - 2 Years
    Replies: 195
    Topics: 25
    #178583

    I have a 54 3.3hp, it is not to much different than you 49. I run TCW3 synthetic oil at 20 to one and it does fine. Those automotive oil that they used to recommend made carbon in the exhaust build up like crazy! Synthetic oils are better for the water we play in and we should all remember that. Big controversy on this website about oil and the ratio. Your old motor has no ball bearings of any type. The thought is more oil is better. My humble opinion is, extra oil just goes out the exhaust.

    dale

    Avatar
    XR55
    US Member - 2 Years
    Replies: 298
    Topics: 30
    #178631

    16 to 1 TCW3 oil. for none bearing motors.

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    mabratton
    US Member - 1 Year
    Replies: 2
    Topics: 0
    #178736

    So not exactly an oil question but related, gasoline. I recently purchased a Johnson 1940 HS-15 and had an old outboard mechanic tell me I will need to go to the air port to buy gas. Could someone comment on what octane to run in this motor.

    frankr
    frankr
    US Member - 1 Year
    Replies: 4244
    Topics: 43
    #178739

    Lots of us use regular 87 octane unleaded pump gas. Others insist on Ethanol-free gas. Let the debate rage on.

    Tubs
    Tubs
    US Member - 1 Year
    Replies: 2266
    Topics: 128
    #178741

    Airplane’s have high compression engines.
    10 to one and higher needing high octane fuel.
    In 1940 compression ratios were around
    5 or 6 to one. It wont hurt anything but your
    wallet. My motors run from 1920 to1953 and
    I buy what ever they have where ever I’m
    at. With or without Ethanol.

    Avatar
    mabratton
    US Member - 1 Year
    Replies: 2
    Topics: 0
    #178742

    thank’s

    phil
    phil
    US Member - 2 Years
    Replies: 84
    Topics: 13
    #178743

    100LL (low lead) avgas has lead, a toxin in it, tho only half as much as auto gas did back in the day….

    http://www.omc-boats.org
    http://www.aerocraft-boats.org

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