Small engine 16:1 old or now 50:1

Discussion in 'The BS Topic' started by Shawn, Dec 9, 2008.

  1. Shawn

    Shawn Veteran Member Lifetime Gold Member

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    Mar 20, 1999
    Graham, WA, USA
    Gas ratios in the old days use to be 16:1 and now most are 50:1 in chain saws. I picked up an old 1980 Pioneer Farm Saw FM and it looks like it has hardly been used, can I use my standard 50:1 saw gas because (the way I'm thinking) oil mixers are better today than they use to be because now most all small engines show 50:1 for 2 cycle?
     
  2. 1981coupe400ci

    1981coupe400ci Veteran Member

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    Dec 22, 2002
    Oregon,IL
    probebly has alot to do with how things are made now and materials. and maybe environmental stuff... less oil needed for lubrication...

    we always just use the multi mix since we have 2 chain saws a weed eater , and a scooter...that all use diffrent ratios...


    its better to have more oil than needed, then not enough...

    http://www.synthetic-motor-oil-air-filters.com/two-cycle/how-to-premix.htm
     
  3. Rick WI

    Rick WI Veteran Member

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    Jul 9, 2001
    Madison, WI
    Even in the "olden days" back in the 80's I never mixed ratios for my saws more than 40:1. Never saw a spec on a saw at 16:1 even with an very old (back in the 80's) Homelight I used to use. I think I'd mix at 40:1 and see how it runs.

    Remember, the more oil you add the less fuel and therefore it runs a leaner fuel ratio, which is why you really don't want to run too much oil.
     
  4. Jazn_84

    Jazn_84 Veteran Member Gold Member

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    Fulton, IL
    I agree with Rick, try 40:1 and see how it runs. Check the plug if you get it started and see if you are rich or lean.
     
  5. 1981coupe400ci

    1981coupe400ci Veteran Member

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    Dec 22, 2002
    Oregon,IL
    the more oil you actually run rich.. not lean.. lean is not enough oil unless i'm reading it wrong? a 100/1 mix is 100 parts gas to 1 part oil. a 50/1 would be 50 parts gas. 16/1 would be 16 parts gas to 1 part oil... making it ok to run a 16/1 mix in about anything(will fowl plugs) .. but only a 100/1 mix in.. a 100/1 engine...??



    less oil than recommended in the fuel makes the engine run leaner and warmer (less power, causes detonation, & overheating, but more important, could cause the motor to seize up), more oil makes the engine run rich and can fowl plugs


    but in general ... better to run rich than lean..


    ?? its late and confusing..
     
    Last edited: Dec 10, 2008
  6. Marks71BB

    Marks71BB Veteran Member Lifetime Gold Member

    I would run a 40:1 mix if you are unsure. any more and the plug will likely foul out.
    It has a lot to do with the better lubricating properties of modern pre-mix oil.

    Adding more oil will in theory lean out the gas to air ratio but I think it would be insignificant at 40~50 to 1 ratios when the adjustment on an older motor is so wide.
     
  7. rscamaro73

    rscamaro73 Administrator Staff Member

    I remember my dad's McCullough chainsaw was 32:1, as was some K-12 saws we used to run in the early 90's.....
     
  8. BLUE72CAMARO

    BLUE72CAMARO Veteran Member Lifetime Gold Member

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    Mar 15, 2004
    Bunker Hill, IL
    We run 100:1 in everything 2 stroke that we own with amsoil 2-stroke oil.
     
  9. Rick WI

    Rick WI Veteran Member

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    Jul 9, 2001
    Madison, WI
    Coupe - You want to keep the rich and lean terms related only to fuel (gasoline). When you increase the oil too much you lean out the gas as the oil doesn't "burn" to produce power. Opposite iis true if you decrease the oil, fueling becomes richer. If you add too much oil you get to a point where no matter what you do with the high and low speed fuel screws it won't run right and will smoke and oil foul the plugs.
     
  10. Shawn

    Shawn Veteran Member Lifetime Gold Member

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    Mar 20, 1999
    Graham, WA, USA
    This is why I asked and I do remember some of the engines 16:1 but was wondering if the oil is just better now? 16:1 seems like a lot.

    Country Talk Discussion Board

    Re: Pioneer Farmsaw Fuel Mix

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    Posted by UncleTom on July 19, 2004 at 14:36:57 from (207.177.98.81):

    In Reply to: Pioneer Farmsaw Fuel Mix posted by Bill Groot on July 19, 2004 at 08:19:30:

    Re: Pioneer Farmsaw Fuel Mix

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    [ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]

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    Posted by UncleTom on July 19, 2004 at 14:36:57 from (207.177.98.81):

    In Reply to: Pioneer Farmsaw Fuel Mix posted by Bill Groot on July 19, 2004 at 08:19:30:

    I also have a pioneer chain saw with the manual and it says 16:1 mix.
    UncleTom
     

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