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

Where or How to Get Dual Port Muffler System for MS 441

Discussion in 'Chainsaws and Power Equipment' started by Ralphie Boy, Nov 20, 2014.

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  1. clemsonfor

    clemsonfor

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    Not 40% more power but 30% faster yes. I saw that in those chicom quakes. Not sure what the 390 was but it was faster than 10%
     
    clemsonfor, Nov 22, 2014
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  2. DexterDay

    DexterDay Administrator

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    He is doing the 441. That's the saw in question (what this thread pertains to)

    The 660 will come later. As per the OP.
     
    DexterDay, Nov 22, 2014
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  3. DexterDay

    DexterDay Administrator

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    Most every builder machines them now. Some do not. Just read a thread elsewhere where one was not going to cut the squishband. Just the base to tighten squish.
     
    DexterDay, Nov 22, 2014
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  4. 94BULLITT

    94BULLITT

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    My MS170 picked up 23% from a muffler mod and 20% from an ignition timing advance.
     
    94BULLITT, Nov 22, 2014
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  5. MasterMech

    MasterMech The Mechanical Moderator

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    My 441 would run a 28" bar just fine when it was stock. I had a lot of fun cutting in a big log at a recent G2G with a Dolmar 9010. The Dolly had a muffler mod and while my little 441 wouldn't beat it, it was very close and that's with just plain round filed chain on it. Better chain and we really would have been turning heads. There is video of this I believe, I'll see if I can dig it up.

    Found it! (There is lots to like in this one but MS441 vs Dolmar 9010 starts at 12:19)




    As I understand it, a woods port costs a bit more nowadays than it used to as well.

    Deleting the base gasket and pop-up pistons have for the most part fallen out of favor with the builders that include a cut base/squish with a woods port.

    Hell, we've all seen 30% gains just with chain! :jaw: Wasn't really anything wild either.

    Stock with .325 round


    Also stock, but with .325 square
     
    MasterMech, Nov 22, 2014
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  6. DexterDay

    DexterDay Administrator

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    To be that close to a muff mod 9010? Says a lot about a ported 441C-M.

    Awesome video...

    Now? Is the OP going to take Adirondackstihl up on that Muff mod?

    Pretty sure you won't be disappointed in his work. :D
     
    DexterDay, Nov 22, 2014
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  7. clemsonfor

    clemsonfor

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    I will want my 390 to run like the 290 he built does!
     
    clemsonfor, Nov 22, 2014
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  8. mdavlee

    mdavlee

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    Woods port used to be $150 back about 10 years ago. Chain is where it's at.
     
    mdavlee, Nov 23, 2014
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  9. MasterMech

    MasterMech The Mechanical Moderator

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    Gimmie a history lesson, were we cutting squish bands and cutting the cyl base back then? Seems like the bump in compression is a big part of the gains we see from a woods port these days.
     
    MasterMech, Nov 23, 2014
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  10. Freakingstang

    Freakingstang

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    no, squish band cutting was something that came around and was fairly new when I disappeared 4 years or so. 10 years ago a port was simply a port. Then DC started milling ( actually on a lathe with mandrels) the cylinder bases to bump compression. So, when that happened, the piston hit, and you had to dome the piston. My first 346 from EC cost me 250ish because of the machine work back in 07-08. that was relatively new to work saw world then, but common place on race saws and cheater saws. lots of 375 topend on 365's running the 4 cube classes, lol. I want to find a good carcus to put it back on and see how it runs with todays runners. My 375p/c was no slouch either. There was a lot of drama about porting and the guys and no one like people doing stuff themselves. When I started doing a few things on my own, certain people didn't like it... there were so many secrets back then.

    part of cutting the squish isn't just the compression increase, but to reduce the combustion chamber size.. if you aren't familiar with huskys, look for pics of a Jred 490 (partner 5K) and 590 cylinder (husky 51/55 closed port), one is 44mm and one is 45mm, but the smaller one always ran better because the combustion chamber was 1/2 the size.
     
    Freakingstang, Nov 23, 2014
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  11. Freakingstang

    Freakingstang

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    another issue with cutting the base and the piston, was depending on how much you dropped the jug, the more you had to remove from the piston top, which led to longevity issues. Lots of thin, single ring pistons out there that used to be dual ring pistons... So in a nutshell, you were raising the compression drastically and less piston material.... and depending on how much you dropped the jug, you ran into too much intake duration, so exhaust had to be raised and blowdown was less than optimum and created peaky saws.
     
    Freakingstang, Nov 23, 2014
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