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Dyno tested........Ported 461 vs stock 461

Discussion in 'Chainsaws and Power Equipment' started by Mastermind, Aug 23, 2014.

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  1. MasterMech

    MasterMech The Mechanical Moderator

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    I would highly doubt that as the ported 660 had increased compression and maybe even advanced timing that would better take advantage of the high octane fuel.
     
    MasterMech, Sep 4, 2014
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  2. MasterMech

    MasterMech The Mechanical Moderator

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    That just confirms what a lot of us gear heads have been saying all along. This just one nail in the coffin for the high octane myth however. A couple more saws, a stock vs stock comparison, and we can pretty much lay this one to rest.
     
    MasterMech, Sep 4, 2014
    #182 Top
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  3. mdavlee

    mdavlee

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    This might be good enough for you.



     
    mdavlee, Sep 4, 2014
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  4. mdavlee

    mdavlee

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    I took them 3 times each video and averaged what I got. I broke it down into 3 cuts. It works out to 10.3% faster for 93 for all cuts.

    110 93
    14.08 11.79 16% faster for 93
    13.19 12.10 8% faster
    13.12 12.18 7% faster
     
    mdavlee, Sep 4, 2014
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  5. MasterMech

    MasterMech The Mechanical Moderator

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    Another nail. Answers the tuning question pretty well doesn't it? :cheers:
     
    MasterMech, Sep 4, 2014
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  6. mdavlee

    mdavlee

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    Yeah I did that for KG461 and posted it on anothersite. It was pretty conclusive to me. I'll finish up the 110 and not spend double on it any more. It does smell good though.

    550 piston with motul 800 and 93 octane.
    004.jpg

    7900 with K2 and 110 octane
    008.jpg
     
    mdavlee, Sep 4, 2014
    #186 Top
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  7. Kg461

    Kg461

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    I was curious with the 110 but understood Randys theory of why lower octane would produce more energy in the saws shorter strokes instead of what we know octane will do in higher compression long strokes
     
    Kg461, Sep 4, 2014
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  8. Mastermind

    Mastermind

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    It really is more than just a theory Keith.

    I'm one of those people that read......and a I read a lot.

    Hot Rod Magazine had a article on combustion chamber design, quench, dwell time, and how all that related to detonation. It was a very good read. After reading that piece, I dug into those topics, and learned a lot about how physical changes to the engine design can effect detonation.

    Detonation robs power in a four stroke, but it destroys a two stroke.
     
    Mastermind, Sep 4, 2014
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  9. Kg461

    Kg461

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    Ive been reading alot on oils this morning. Sea Doo has an excellent article. Reading on the R50 also as Im interested in it
     
    Kg461, Sep 4, 2014
    #189 Top
  10. clemsonfor

    clemsonfor

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    Do you have anything g good in the shed? What do you do when you needs something out of it?
     
    clemsonfor, Sep 4, 2014
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  11. clemsonfor

    clemsonfor

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    Does this post seem out of place to anyone but me?:rofl: :lol::rofl: :lol:
     
    clemsonfor, Sep 4, 2014
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  12. clemsonfor

    clemsonfor

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    Did you retune the saw with each fuel or run the same tune?
     
    Last edited: Sep 4, 2014
    clemsonfor, Sep 4, 2014
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  13. mdavlee

    mdavlee

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    It had to relearn when it went to 93. Probably made 15 cuts before it was back to normal and not stumbling.
     
    mdavlee, Sep 4, 2014
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  14. clemsonfor

    clemsonfor

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    Ahh, auto tune
     
    clemsonfor, Sep 4, 2014
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  15. mdavlee

    mdavlee

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    Yep.
     
    mdavlee, Sep 4, 2014
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  16. fox9988

    fox9988

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    Higher octane=Less explosive=More stable.
    If an engine doesn't need high octane fuel (to prevent pre-detonation) , it will produce less power on high octane fuel.
     
    fox9988, Sep 4, 2014
    #196 Top
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  17. mdavlee

    mdavlee

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    If I can get away I may buy a gallon of 87 and retest in the 550 also.
     
    mdavlee, Sep 4, 2014
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  18. clemsonfor

    clemsonfor

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    I have been buying/using 87 pure NON E gas lately and mixing 32:1.
     
    clemsonfor, Sep 4, 2014
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  19. mdavlee

    mdavlee

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    I bought 93 last time since it was so hot. It's been in the upper 80s low 90s and I've been milling. I did it last summer with 87 so it shouldn't matter this year.
     
    mdavlee, Sep 4, 2014
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  20. clemsonfor

    clemsonfor

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    Its been mid 90s here. I have been cutting right through that weather. But I dont mill thats way harder on the saw
     
    clemsonfor, Sep 4, 2014
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