In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

Dyno tested......... Mastermind ported 660 vs Stock 660 vs Dual port 660

Discussion in 'Chainsaws and Power Equipment' started by Dynomite, Sep 1, 2014.

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  1. Dynomite

    Dynomite

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    Amazing just plain amazing!!!!!! Thanks Ronnie for sending this saw to test! [​IMG]
     
    Dynomite, Sep 1, 2014
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  2. KilliansRedLeo

    KilliansRedLeo

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    Randy's saw is making more HP @ 12K than the other two did at peak @ 9K! Thats some pretty hot chit!
     
    KilliansRedLeo, Sep 1, 2014
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  3. mdavlee

    mdavlee

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    Nice gains and curve. Thanks for testing all this stuff.
     
    mdavlee, Sep 1, 2014
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  4. SquareFile

    SquareFile

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    Man a stock 660 is a turd, but put a $20 DP cover on it wakes it up!:saw:

    Then Randy takes it to a whole new level:dex:

    Thanks Chad, Ron, and Randy that's just awesome:dancer:
     
    SquareFile, Sep 1, 2014
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  5. DexterDay

    DexterDay Administrator

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    Wow... So Hawt!! :dex:

    A min of 2 HP, with about 3 HP being an average. Good job Randy.. :thumbs:

    Ronnie, Thanks for letting Chad use your saw. :)

    Chad, Thanks for taking the time out of your busy day. :)
     
    DexterDay, Sep 1, 2014
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  6. Dynomite

    Dynomite

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    The 660 stands as King in ported version.
    [​IMG]
     
    Dynomite, Sep 1, 2014
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  7. mdavlee

    mdavlee

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    There around 10.5k rpms they're within .5 hp and that's where a lot of them will cut without a lot of pressure. That's probably why most people with ported ones don't see the big difference in cut speed.
     
    mdavlee, Sep 1, 2014
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  8. DexterDay

    DexterDay Administrator

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    At 10,500 they are only a 1/2 HP apart! That's still a stout 461! Seeing how it's gonna live right around there in the real world! Awesome! Thanks again! !
     
    DexterDay, Sep 1, 2014
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  9. DexterDay

    DexterDay Administrator

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    Mike beat me by mere seconds! Great minds think alike! :)
     
    DexterDay, Sep 1, 2014
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  10. KilliansRedLeo

    KilliansRedLeo

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    Good point Mike, also of note is that @9.5K-10.5K the ported 660 is making 1HP more. That being said, folks could actually run at a lower RPM, get more and save stress on the saw.
     
    KilliansRedLeo, Sep 1, 2014
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  11. Mastermind

    Mastermind

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    The ported 660 needs to run an 8 pin......that would help take advantage of the lower HP point.
     
    Mastermind, Sep 1, 2014
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  12. Chvymn99

    Chvymn99 Moderator

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    Wow... Impressive graph... Especially the break down on stock to muffler job to port job. :yes:
     
    Chvymn99, Sep 1, 2014
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  13. Ron660

    Ron660

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    Here's the percent increases of the ported 660 over the stock 660:
    RPM's %>
    8500 = 35.4
    9000 = 37.5
    10000 = 59.7
    11000 = 73.7
    12000 = 180
     
    Ron660, Sep 1, 2014
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  14. Ron660

    Ron660

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    Randy, I have an 8-pin and I'll definitely switch it from the stock 7-pin.
     
    Ron660, Sep 1, 2014
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  15. SquareFile

    SquareFile

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    :bug:
     
    SquareFile, Sep 1, 2014
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  16. Ron660

    Ron660

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    Here's the percent increases of the ported 660 over the ported 461:
    RPMS's %>
    8000 = 19.1%
    9000 = 15.8%
    10000 = 13.7%
    11000 = 16.5%
    11500 = 19.3%
    12000 = 77.7%
     
    Ron660, Sep 1, 2014
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  17. KilliansRedLeo

    KilliansRedLeo

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    An 8 pin would surely keep chain speed up at a lower RPM about 12% different ratio to final drive with the 8 pin. Number wise 9.5k is 90.4% of 10.5K RPMs well within the range of the 8 pin to deliver the same chain speed at 9500.
     
    Last edited: Sep 1, 2014
    KilliansRedLeo, Sep 1, 2014
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  18. MasterMech

    MasterMech The Mechanical Moderator

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    This is where dynos do not tell the whole story. If we step up the sprocket size to lower engine RPMs and maintain the same chain speed, what have we gained other than weight? That graph looks to me to be a saw that needs to run a bigger bar in bigger wood than the 461.

    I love how flat that ported power curve is, betcha you can lean on that saw so hard it needs a seat. ;):dancer:

    And what was Stihl advertising the 660 at stock? 7.0 hp? :rofl: :lol: Not even close with the DP, let alone stock.

    @KilliansRedLeo Randy's saw looks to be making more power than the stocker at clutch stall rpm! :D
     
    MasterMech, Sep 1, 2014
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  19. Kg461

    Kg461

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    Ya that 660 is a torque monster. Hats off to Randy. Ive always wondered how a ported 461 would do against a ported 660 in wood 25" and under? Anyone know?
     
    Kg461, Sep 1, 2014
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  20. the GOAT

    the GOAT Banned

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    It would be interesting to see the saws cutting the same log (before and after ported) and see how the gains in the dyno chart compare to performance in the log.
     
    the GOAT, Sep 1, 2014
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