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

Playing With Some MS661s

Discussion in 'Chainsaws and Power Equipment' started by Mastermind, Jan 15, 2015.

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  1. Mastermind

    Mastermind

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    661 1.jpg
     
    Last edited: Jan 15, 2015
    Mastermind, Jan 15, 2015
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  2. Mastermind

    Mastermind

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    I've been messing with these things all week.....I'm not excited about the intake timing numbers they end up when machine work is done on them.

    So.......

    MS661 014.jpg

    MS661 016.jpg

    MS661 017.jpg

    MS661 018.jpg
     
    Last edited: Jan 15, 2015
    Mastermind, Jan 15, 2015
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  3. Mastermind

    Mastermind

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    MS661 022.jpg
    MS661 023.jpg

    Then a stock intake to compare....

    MS661 024.jpg
     
    Last edited: Jan 15, 2015
    Mastermind, Jan 15, 2015
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  4. DexterDay

    DexterDay Administrator

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    :dex: Any other saw that needs that attention?

    Is it because of how much needs taken off the base? Large squish from Stihl..?
     
    DexterDay, Jan 15, 2015
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  5. fox9988

    fox9988

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    The pics are not showing up for me.
     
    fox9988, Jan 15, 2015
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  6. Deacon

    Deacon

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    X2
     
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  7. Mastermind

    Mastermind

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    The intake is already low.......then when I machine the squish band, and the base, it gets a little to low for my taste.

    I wonder what's up with the pics?
     
    Mastermind, Jan 15, 2015
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  8. Mastermind

    Mastermind

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    See if that fixed the pics.....
     
    Mastermind, Jan 15, 2015
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  9. Chvymn99

    Chvymn99 Moderator

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    Pics are working on my end. Looks good!
     
    Chvymn99, Jan 15, 2015
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  10. Mastermind

    Mastermind

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    Here's one ported without raising the intake.....

     
    Mastermind, Jan 15, 2015
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  11. Mastermind

    Mastermind

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    Hopefully the next one will be stronger.....
     
    Mastermind, Jan 15, 2015
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  12. Deacon

    Deacon

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    Yep , getting pics now
     
    Deacon, Jan 15, 2015
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  13. MasterMech

    MasterMech The Mechanical Moderator

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    Thanks for bringing this to FHC Randy! I've got my eye on a 661 and the few guys here that have posted pics with theirs are not helping me fight the urge any.
     
    MasterMech, Jan 15, 2015
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  14. Hinerman

    Hinerman

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    Very interesting. Never heard of adding aluminum, only grinding away.
     
    Hinerman, Jan 15, 2015
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  15. Mastermind

    Mastermind

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    The lower the intake, the less case compression the engine will have.

    Case compression occurs from the time the intake port closes, and the upper transfer ports open.

    I like to see around 40* of crankshaft rotation between those points.

    The way I have this cylinder setup it has these timing numbers......

    Ex: 100*
    Tr: 120*
    In: 80*

    These are opening points as measured from TDC.
     
    Mastermind, Jan 16, 2015
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  16. concretegrazer

    concretegrazer

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    Interesting. Would adding something in the case increase compression as well?
     
    concretegrazer, Jan 16, 2015
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  17. Mastermind

    Mastermind

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    It would, but this saw has a pretty tight case already.

    [​IMG]

    [​IMG]
     
    Mastermind, Jan 16, 2015
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  18. concretegrazer

    concretegrazer

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    They sure didn't give you much to play with.
     
    concretegrazer, Jan 16, 2015
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  19. Mastermind

    Mastermind

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    No, they really didn't.

    With the intake timing where it is, it's sorta like they were trying to keep me from getting big gains.

    I'll show dem Germans......

    :saw:
     
    Mastermind, Jan 16, 2015
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  20. Ron660

    Ron660

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    Are those numbers similar to an 066 or 660? Best I remember my 660's exhaust was at 101? Since mine had a damm good jug!
     
    Ron660, Jan 16, 2015
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