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Oxygenated fuel in saws do’ And don’ts

Discussion in 'Ask the Experts' started by ADMO services, Jan 26, 2020.

  1. ADMO services

    ADMO services Guest

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    what does one do to get started running alcohol in a saw? Do the fuel lines, carb diaphragms, etc need to be changed to a higher quality? Am I to fog the crankcase with wd40 after every run? What mixture and type of oil? Retuned for probably a/f of course. If anyone can point me in the right direction it would be much appreciated! Thanks guys!
     
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  2. Czed

    Czed Aluminium Member

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  3. Stihlbro

    Stihlbro Pinnacle OPE Member GoldMember

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    What will the saw be used for?


    You have to find an oil that will mix with methanol. Klotz super techniplate will. Alcohol or called methanol is like the ethanol in gas. it is harder on the rubber parts of the fuel system. To make a chainsaw run on methanol, you have to make the fuel system run more volume than gas. Like 2 or 3 or 5 time more. This is tedious work that can be done and has for a long time in the racing world of chain saws. The gain if found comes with more maintenance.

    I can keep going, but will wait till I find what your saw will be used for. Your title says oxygenated fuel, your post is alcohol.


    Joey
     
  4. dmb2613

    dmb2613 Super OPE Member GoldMember

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    We ran methanol in kart engines back in the 80s had to run them between 350 and 400 degrees to get max power had to richen them up while running to keep them below 400 as they would seize up at a bit over 400 fun but very costly. ran a very thin synthetic oil of course they were 4 strokes some ran the 2 strokes but I never did. many different classes
    And I found out that age had caught up with me and I stopped racing Karts
     
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  5. ADMO services

    ADMO services Guest

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    Yes methanol and klots. I’m familiar with this type of running that volatile fuel in outboard racing. So I understand it runs more than double the stoichiometric. I’m more asking from the stand point of the small carbs and what it takes to get them to hold up.
     
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  6. ADMO services

    ADMO services Guest

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    I’m just making a race saw for occasional use
     
  7. ADMO services

    ADMO services Guest

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    I’ve not decided on if I will use oxygenated fuel.
     
  8. ADMO services

    ADMO services Guest

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    There’s no we here just me and I’ve got 20+ years in building outboard, Diesel, drag, and saw engines. I’m not much of a racer, tbh I don’t much like to go fast. For me I just like the thrill of getting more from an engine. Just want a saw to play around with just to appease myself. If anyone has some guidance on the subject I would greatly appreciate it. I’m no expert but not green. Somewhere in between like most of you.
     
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  9. mdavlee

    mdavlee Hillbilly grinder

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    Fitting a larger carb and then drilling the H jet is normally a good start in them. Sometimes the throttle linkage is the hardest part period.
     
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  10. Deets066

    Deets066 AKA Deetsey

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    After your runs on alky, use a flush fuel to save your fuel system
     
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  11. ADMO services

    ADMO services Guest

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    372xp carb fits fairly easily on echo cs520/530 which is my build
     
  12. Deets066

    Deets066 AKA Deetsey

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    Rwj flows lots of air, they need work to flow good fuel
     
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  13. ADMO services

    ADMO services Guest

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    Numbered drill bits and jets while checking spark plug color. As well as popping on deceleration. Busted lots of reeds learning this btw. Lucky no reeds on these saws
     
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  14. ADMO services

    ADMO services Guest

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    @Deets066 that's the best point made so far thanks for reminding me of that
     
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  15. Deets066

    Deets066 AKA Deetsey

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    What else is done to the echo?

    you need some extensive work to make use of alky
     
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  16. ADMO services

    ADMO services Guest

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    It’s not built yet. Are you referring to replacing the plastic cage wrist pin bearing and better seals?
     
  17. ADMO services

    ADMO services Guest

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    Also have not decided what compression to shoot for. I can get 220psi fairly easily but oxygenated fuel likes an open combustion chamber. What would the optimal squish be for alky fueled saw with a 45mm bore?
     
  18. Deets066

    Deets066 AKA Deetsey

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    I was more referring to porting.
    The cylinder needs to flow more.
    Exhaust obviously too, echo’s are choked up
     
  19. Deets066

    Deets066 AKA Deetsey

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    I’d start with 180 psi
     
  20. Stihlbro

    Stihlbro Pinnacle OPE Member GoldMember

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    The gain running methanol is minimal unless the saw is built for it, compared to gas. Methanol is high octane, it’s ability to run cooler is an advantage. But all the extra maintenance takes some of the fun out of it.
    There are plenty of gas options out there that a person could spend days experimenting.
     
    Last edited: Jan 29, 2020
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