Fuel mixture Evinrude 18 HP Fastwin 1960

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  • salnaes

    International Member - 1 Year
    Replies: 35
    Topics: 7
    #269319

    I’m finished restoring my Evinrude 18 HP 1960 and ready to start the engine in a test tank for the first time. There are new pistons and rings, honed cylinders, all new gaskets, seals, bolts and much more. All ignition parts (coils, points, condensers, spark plugs, leads and so forth) are new. Carburetor is serviced with new float, needle, gaskets and all parts that came with the overhaul kit. Filter bowl is serviced with new filter and gasket. New fuel pump is installed. All fuel lines are new, on tank and engine. I can’t think of anything that’s not been serviced.

    I have been reading posts here on this forum to find the correct fuel mixture to use now. I think that 24:1 mixture is what I have to use. Right? I guess that’s approximately 4% of oil in the fuel mixture. Am I right? So if I have 10 liters of fuel, then I have to add 0,4 deciliters of oil? (I apologize for using European units, since I’m Norwegian)

    A local marine mechanics here at my place think that’s way too much oil since oil in 2022 is much better than oil was back in the days, he says. He says that 1% is enough!

    I wanna listen to experienced people here at aomci, and follow the best advice. I recon you know this better, so I ask for help.

     


    crosbyman

    Canada Member - 2 Years
    Replies: 2929
    Topics: 281
    #269320

    I  believe 1960’s will run on 50/1 but to keep it simple  mix 1L  quality twc3 in 25 L fuel for a 25/1 mix and no harm will come to your oldy  🙂

    any smoke is good for the bugs anyway

    you did do the impleller and GC oil….

     

    Joining AOMCI has priviledges 🙂

    • This reply was modified 1 week, 3 days ago by crosbyman.
    • This reply was modified 1 week, 3 days ago by crosbyman.

    fleetwin

    US Member - 2 Years
    Replies: 4367
    Topics: 43
    #269323

    While today’s oils have surely improved, I would recommend staying with the original 24:1 mixture, especially during the break in.  These engines, when in good tune, hardly smoke at all, even at 16:1.  Stick with the original recommendation, 24:1.


    billw

    US Member - 2 Years
    Replies: 1909
    Topics: 62
    #269324

    I run 24:1 in my 18s all the time. Not too much smoke and added assurance against any damage. These engines seems to be often found with the power heads frozen from corrosion in the cylinders and/or bearings. In my mind, 24:1 will help combat that, a little bit.

    Long live American manufacturing!


    salnaes

    International Member - 1 Year
    Replies: 35
    Topics: 7
    #269325

    Thanks all for answering. I’m a little confused about the notation 24:1. Could you tell me what it means? Does it mean 24 parts gasoline and 1 part oil?

    Yes, I did the impeller and gear case too. Everything is restored.


    crosbyman

    Canada Member - 2 Years
    Replies: 2929
    Topics: 281
    #269328

    one Liter  (1000 cc)  of twc3 oil   in one tank of 25 Ltrs fuel…simple

     

    if you want 24/1    take  25 L (25000cc  devide by 24)   you get  1041.666 cc’s

     

    in conclusion    just  mix  1 ltr oil in 25 ltr  fuel  ====>  25/1  the engine won’t know the difference between 24/1 or 25/1

    Joining AOMCI has priviledges 🙂


    Steve D


    Replies: 620
    Topics: 57
    #269331

    Yes that’s what it means. 24:1 = 128 oz. gas (1 gal) to 5.33 oz. oil. Here’s a handy chart.

    mix-chart

    Attachments:

    salnaes

    International Member - 1 Year
    Replies: 35
    Topics: 7
    #269338

    Wow! Thank you all for helping me on this issue. I will use 24:1 with twc3 oil and perform break-in procedures in a test tank.

    Break-in as follows:

    1. Operate at 1/2 throttle for 2 hours (2500 – 3500 rpm)
    2. Operate at different speed except full throttle the next 8 hours.

    As soon as the engine starts I will check for water coming out with the exhaust. If not, I will stop the engine and check why it’s not cooling.

    I will also have to adjust low speed and high speed on the carburetor, but the needles are already set to initial settings: 3/4 turn out on high speed and 1-1/2 turn out on low speed. Hope that’s right.

    Synchronization  is already performed according to tune-up specs (center of the roller on cam mark when throttle shaft starts moving).  Manual Seloc.

    Spark plugs gaps are set to 0.30” and I used the special timing tool and multimeter to set the points break. I don’t have a Buzz box, so I had to disconnect the leads from coil, condenser and stop-button to have the buzzer on the multimeter signal at the correct position. I’m pretty sure I didn’t move the point gap when fastening the leads after setting the break point. Ignition leads, spark plug caps and spark plugs are brand new. So I’m really exited now. Hope everything works.

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