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661 Oil Test 32:1 vs 40:1 vs 50:1 ?

Discussion in 'Chainsaw' started by redbull660, Mar 25, 2015.

  1. redbull660

    redbull660 Addicted to ArboristSite

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    ***EDIT - Test completed...jump to page 15. http://www.arboristsite.com/communi...1-vs-40-1-vs-50-1.276534/page-15#post-5300597



    Looking for some opinions on a test I'm going to do, hopefully this saturday.

    Test - mix up 32:1 40:1 and 50:1 with stihl utlra and 92 oct eth free. Start off with 50:1 and do a couple of timed test cuts then take the jug temp with the thermo gun. Then empty the saw and refill and run 40:1 for a bit to get the mtronic doing it's thing with 40:1, then do couple of timed test cuts and take jug temp and repeat same process with 32:1.

    Saw - 661R.
    Bar - 36" tsumura
    Chain - that is the question - I can run either 3/8 or .404. new Stihl RS.

    3/8 - pretty much everyone uses that but..
    404 - seems to me 404 would require more power and it seems to me that if there was THAT much difference the 404 would make the saw and mix show it better.

    So what do you guys think?
     
    Jhenderson, Ron660, treedoc40 and 7 others like this.
  2. KG441c

    KG441c Keith

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    That will be very interesting. Dino vs 100% ester bases would also be interesting
     
  3. funky sawman

    funky sawman Addicted to ArboristSite

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    VERY interesting....
     
  4. funky sawman

    funky sawman Addicted to ArboristSite

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    I been running mine with motul 800 2t off road, at 40:1, Im not liking what I see on top the piston
     
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  5. nk14zp

    nk14zp ArboristSite Guru

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    .404 fer the test.
     
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  6. Haywire Haywood

    Haywire Haywood Fiscal Conservative Social Retard

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    Total waste of time. :)
     
  7. KG441c

    KG441c Keith

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    My favorite is Belray H1R
     
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  8. Moparmyway

    Moparmyway Its just a saw

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    I vote .404 and agree 100%, the .404 will need more power and make more of a difference if there is a difference to be seen

    I get H1R on Amazon
     
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  9. Moparmyway

    Moparmyway Its just a saw

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    I think different oils do different things with different fuels.
    When I run pump gas with ethanol and 800, combustion chambers look much dirtier than when I run 800 with VP
     
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  10. Natty Bumppo

    Natty Bumppo ArboristSite Operative

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    I wouldn't expect enough of an improvement or liability to make a difference in cutting speed by changing gas/oil ratios in that range. I thought most of us went with 40:1 or 32:1 rather than the manufacturer's recommended 50:1 for better lubrication and engine protection.
    Of course, I could be wrong.
    Oh, and go with .404
     
  11. Trx250r180

    Trx250r180 Saw polisher

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    I will throw some bel ray in with the bar when i ship it today ,i have 4 -5 oz in a bottle here ,4 oz will be 32 to 1
     
  12. redbull660

    redbull660 Addicted to ArboristSite

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    thanks man! ok well looks like we're doing 32:1 bel-ray as well
     
  13. blsnelling

    blsnelling Site Contributor

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    I will run 32:1 regardless of cut times, simply for the protection factor.
     
  14. Trx250r180

    Trx250r180 Saw polisher

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    In my motocross days ,32 to 1 was found to make more power
     
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  15. Chev727

    Chev727 ArboristSite Operative

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    I've always ran 32:1 in all my 2 strokes from motocross bikes to saws and never an issue with them
     
  16. KG441c

    KG441c Keith

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    .
    whats your current liking Brad?
     
  17. redbull660

    redbull660 Addicted to ArboristSite

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    oil does burn hotter so maybe 32:1 will be too rich and run hotter than 40:1. To little possibly 50:1 = bad as well? Maybe 40:1 is the sweet spot. Who knows. All speculation. This is why I test stuff. Hopefully we'll get some good info.
     
  18. KG441c

    KG441c Keith

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    Something else to test. Ive liked Mustang Mikes theory of how much hotter does lower octane burn and the temp. Difference on the engine
     
    MustangMike likes this.
  19. KG441c

    KG441c Keith

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    Yes I agree 87 will make more power but maybe at the expense of more heat but heat does produce energy?
     
  20. cuttinties

    cuttinties Account Hold

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    87 makes more power. The trapped compression ratio on saws is much to low to see any benefit from higher octane fuel.
     

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