ArboristSite.com Sponsors
 
 


16:1 32:1 40:1 50:1 fuel mix

Discussion in 'Chainsaw' started by dsell, Aug 14, 2011.

  1. dsell

    dsell ArboristSite Operative

    Joined:
    Mar 4, 2009
    Messages:
    485
    Likes Received:
    28
    Location:
    Kansas
    I've been reading some posts and replies this morning on roached pistons, ethanol, and fuel mixes. If the same person, (me), tunes the same saw with 16:1, 32:1, 40:1, or 50:1 mixture, is there really any difference? I was taught buy a Homelite mechanic in the 80's to rev the saw to full rpms and lean the high screw until it's screaming smooth, then open the screw back up until it glugs. I have a pile of saws, mower, hedge trimmer, weed wacker that are all 2 cycle engines. I use the same can of gas for the whole mess, 32:1. There is a Husqvarna 50 in the family that was purchased in 87, cut many cords of wood, still running today on the same piston, tuned at 32:1.

    I don't like the ethanol in fuel due to the effects on the fuel lines. It also seems to go bad extremely quick. However, where am I suppose to find fuel without alcohol? It will be a very cold day when I buy canned gas premixed for $24 a gallon. We have 87 and 89 octane at the pumps in this town, and I'm not sure of the 3rd rating at some stations because I've never bought it. Other than the fuel line problem and the shelf life, is the ethanol really a problem for homeowners like myself that cuts 3 cords of wood a year? I drain my saws and run them dry at the end of the season. I leave the fuel caps off for a week to let the rest evaporate.
     
    MacLaren likes this.
  2. o8f150

    o8f150 Tree Freak

    Joined:
    Jan 24, 2010
    Messages:
    14,356
    Likes Received:
    3,616
    Location:
    western ky
    i put marine stabil in with the mix, it does help the shelf life
     
  3. MS460WOODCHUCK

    MS460WOODCHUCK Addicted to ArboristSite

    Joined:
    Jun 30, 2008
    Messages:
    4,290
    Likes Received:
    641
    Location:
    Ohio
    I have all of my saws tuned to run at 40:1 and use nothing but synthetic mixed into 89 octane. I won't run fuel that has set much more than about 6 weeks. JMO
     
  4. FATGUY

    FATGUY Addicted to ArboristSite

    Joined:
    Jun 2, 2008
    Messages:
    6,538
    Likes Received:
    1,459
    Location:
    Originally, ON Canada, now Cincinnati OH
    The oil mix ratio is not determined so much by the manufacturer of the OPE but the manufacturer of the oil. I find temperature has more of an effect on tune than mix ratio. As far as ethanol goes, you have 2 things to worry about. Rotting fuel lines and diaphragms are one and the second is fuel degredation. Degredation can be lethal to your OPE because the water seperation will literally wash the oil off components. This can be avoided by never using mix older than 6 weeks . Fuel lines and diaphragms will rot quicker regardless of mix age. That ethanol is always in there eating away.
     
  5. tbone75

    tbone75 Slugerator !!

    Joined:
    Mar 8, 2011
    Messages:
    40,516
    Likes Received:
    5,184
    Location:
    Frazeysburg-Ohio
    Sure sounds like your doing just fine!I just use fresh mix and do just as you running them dry if I don't plan on using them for a while.I never keep the mixed gas more then a month.I just put it in the mower and use it up after that.I don't think the ethanol is that big of problem.Other than what you already stated.The only real problem with new saws I have seen is they are set way to lean from the factory due to epa crap.I think thats why the box store saws never last long.
     
  6. Slamm

    Slamm Addicted to ArboristSite

    Joined:
    Jan 31, 2007
    Messages:
    3,127
    Likes Received:
    439
    Location:
    Western Kentucky
    Find a little local airport and buy their 100LL aviation gas and worry no more. I run it and leave it in everything weedeaters, saws I don't use much or often (084/036), they all start and run fine with no loss of use or repairs needing to be made in years with regards to bad gas or ethanol eating up the rubber lines and gaskets .................. read that again............ zero problems, and I leave it in everything never have to drain it or wonder what mix is where. Everything gets the bluish 100LL with bluish Amsoil Saber (have run it at 80:1 and now at 50:1 and between depending on whats left in the bottle, LOL), and it goes into Blue Kerosine jugs. My wife and I are the only people allowed to mix the gas in those tanks, no kids or employees or newbies.

    I only use car gas if there are several cutters running saws per day and we are burning up 5-15 gallons per day, and I know its going to get used quickly (93 octane).

    That is what I do.

    Sam
     
  7. 2dogs

    2dogs Addicted to ArboristSite

    Joined:
    Sep 2, 2007
    Messages:
    6,633
    Likes Received:
    1,673
    Location:
    Santa Cruz CA
    I run Opti 2 at 100:1 in everything from the hedgers to the cursed 090. No problems even with California gas with Obamathol. I only mix what I need for a week, never more than 10 gallons at a time, and like Sam I do the mixing. (On ocassion I mix Blenzol but since it is clear I am prohibited from using on company jobs.)

    In my opinion corn should be used to make tortillas, corn on the cob, and chicken feed. Corn is a great food source but a lousy fuel source. But, I live in Cali and I don't want to buy race gas so instead I use only Chevron Supreme.
     
  8. gallegosmike

    gallegosmike Addicted to ArboristSite

    Joined:
    Oct 7, 2008
    Messages:
    1,138
    Likes Received:
    109
    Location:
    Land of loose NUTS, Really Big FLAKES, and Fruity
    Buy a few cans of 40fuel or 50fuel and use it flush out the carb on your saws. During the firewood season. I fill up the night before I go cutting. Normally the day after or so. I clean up my saws and flush out my premix with 40fuel. I've using "Marvel Mystery Oil" & stabil in my premix and it seems to be helping out with the ethanol.

    I use only 91 octane because it has the lowest amount of ethanol @ 5% vs. 86 or 88 octane @ 10% ethanol. That is local to me, I am not sure about any where else.

    I live at high altitude, so the weasels short us on octane ratings because engines can get by with lower octane amounts! On N/A engines at high altitude, less effective compression ratio you have(other then turbo or super charged) so lower octane fuel is okay use.

    My .02

    Mike
     
  9. dswensen

    dswensen AboristSite Guru

    Joined:
    Sep 24, 2008
    Messages:
    576
    Likes Received:
    89
    Location:
    SW Washington
    Probably a dumb question, but here goes.

    I read all the time about ethanol killing fuel system components. Is this only if you leave the fuel in the system? I mean, I drain my fuel tanks and then run the carbs dry before I put them away (I don't get to cut as much as I'd like). When they have been drained, run dry, and put away, is the ethanol residue still eating the parts? Or is the danger only there if you store the saw with fuel in it?
     
    MacLaren likes this.
  10. FATGUY

    FATGUY Addicted to ArboristSite

    Joined:
    Jun 2, 2008
    Messages:
    6,538
    Likes Received:
    1,459
    Location:
    Originally, ON Canada, now Cincinnati OH
    I think as long as there is ethanol in the gas it's doing damage. If your tank and lines are dry/empty I doubt the residual ethanol would do any harm.
     
    ray benson likes this.
  11. CTYank

    CTYank Peripatetic Sawyer

    Joined:
    Aug 26, 2010
    Messages:
    3,061
    Likes Received:
    1,119
    Location:
    SW CT
    From what I can see, it's paranoia.

    Undoubtedly there are retailers who let water collect in their tanks, possibly dissolving partly in the ethanol. Low turnover would be an indicator. WTF is "ethanol residue"? Some sort of whiskey memory?

    Most all 50:1 synthetic mix oils contain fuel-stabilizer, so the paranoia there should dissipate.

    Not a bad idea to store fuel/mix in sealed containers, and avoid high humidity same as with saws.
     
  12. WoodChuck'r

    WoodChuck'r LOTRĀ²

    Joined:
    Jan 7, 2001
    Messages:
    6,776
    Likes Received:
    1,622
    Location:
    Poopin' in yer bathroom.
    I actually said this in another thread:


     
  13. gallegosmike

    gallegosmike Addicted to ArboristSite

    Joined:
    Oct 7, 2008
    Messages:
    1,138
    Likes Received:
    109
    Location:
    Land of loose NUTS, Really Big FLAKES, and Fruity
    Do not quote me on it, but I am of the frame of mind to think that most 50 to 1 synthetic mix oils containing fuel-stabilizer where formulated for non-ethanol fuels. It is one thing to have a stabilizer and another thing to have something strong enough to remove all the water that goes with ethanol laced fuels. Ethanol is super hygroscopic and even in so called sealed cans. You will get water contamination if you keep the stuff long enough.

    That is local to me, you mileage will very...

    My .02

    Mike
     
  14. tallguys

    tallguys Addicted to ArboristSite

    Joined:
    Sep 29, 2009
    Messages:
    1,890
    Likes Received:
    588
    Location:
    Ontario, Canada
    You run the 100:1 Opti 2even with older 32: or 25:1 2-strokes without any problems or issues? Just wondering as to how that works, is all.
     
    MacLaren likes this.
  15. jcl

    jcl ArboristSite Operative

    Joined:
    Aug 7, 2011
    Messages:
    155
    Likes Received:
    37
    Location:
    nh
    I work for a rental company that sells and repairs chain saws. this year have had about a dozen of saws melt down. we got a e-mail from Dolmar that if gas in your area has more then 10% ethanol customers need to mix 50/1 synthetic 25/1 non
     
    MacLaren likes this.
  16. MacLaren

    MacLaren Addicted to ArboristSite

    Joined:
    Jul 23, 2010
    Messages:
    6,033
    Likes Received:
    1,273
    Location:
    Leicester,NC
    It's hard to tell just how much Ethanol is in the gas though. I believe they passed a law in NC that as long as the tank/gas station says it has ethanol in the gas, then it dosent have to specify what %. However, for me, I've never ran gas with ethanol in my saws. I'm lucky enough to have access to a couple non-ethanol gas stations. I also use the VP94 No-Ethanol gas as well.
     
    wendell likes this.
  17. Chris-PA

    Chris-PA Where the Wild Things Are

    Joined:
    Jul 9, 2011
    Messages:
    6,378
    Likes Received:
    2,835
    Location:
    PA
    I'm running Pennzoil Premium Plus Marine Synthetic and E10 pump gas. I use 40:1 for the Poulan, Sears and MAC, and 50:1 for the Husky and Stihl. I was running 32:1 on the Mac, but my third can cracked and I hate these new cans and their stupid spouts, and I refuse to buy another so it will have to get by on 40:1!
     
  18. Andyshine77

    Andyshine77 Addicted to ArboristSite

    Joined:
    Jan 25, 2004
    Messages:
    7,256
    Likes Received:
    1,582
    Location:
    Cincinnati, OH
    Pennzoil Premium Plus Marine Synthetic is a TC-W3 oil. TC-W3 oil is not made to run in air cooled engines, it will eventually cause carbon issues.

    As far as I know Opti-2 is not recommended to be mixed at anything over 80:1 and to me that's pushing the limits of any oil let alone a semi synthetic oil like Opti-2
     
  19. Chris-PA

    Chris-PA Where the Wild Things Are

    Joined:
    Jul 9, 2011
    Messages:
    6,378
    Likes Received:
    2,835
    Location:
    PA
    Thanks - I'll change it.
     
  20. Chris-PA

    Chris-PA Where the Wild Things Are

    Joined:
    Jul 9, 2011
    Messages:
    6,378
    Likes Received:
    2,835
    Location:
    PA
    I dumped the fuel in all the saws and mixed up fresh with premium E10 (at least as far as I know it's E10) and Husqvarna XP oil. I pulled the plugs too and cleaned them where needed. The 3 saws I ran today ran great. I doubt I'll stick with the Husqvarna oil long term, but for this batch it works well.
     
    Last edited: Aug 17, 2011

Share This Page