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Husqvarna 550xp pop up

Discussion in 'Chainsaws' started by WoodsliverDan, Dec 4, 2018.

  1. Terry Syd

    Terry Syd Pinnacle OPE Member

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    Why bother? The strato may furnish fresh air, but that (air) is what you need to make more power.

    With the turbulence in the cylinder and especially at TDC with the squish the cylinder charge (air, exhaust, mixture) is essentially a homogeneous mixture - it is all mixed together.

    That's why a 'strato' can work, the mixture is homogeneous when it starts to burn. (you may have noticed that the stratos are making more power than older designs)

    If you mix the two flows you will simply be loosing mixture out the exhaust port during the cylinder charging phase. You still have the same air in the cylinder, but some of the fuel will go out the exhaust port. In other words, you will have increased the fuel consumption without an increase in power.
     
  2. tree monkey

    tree monkey Jon1212 Approved!

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    you tell em terry, I've tried for a couple years

    also any fuel going through the strato's doesn't lube or cool the engine
     
  3. Farmchuck

    Farmchuck Super OPE Member

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    Glad to hear I’m not the only one who can’t take the racket.:thumbsup:
     
  4. mortalitool

    mortalitool aka Nick Stoeckel

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  5. Chainsaw Jim

    Chainsaw Jim #fartedinthebandwagon

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    Every time I read this it makes me wonder if an expansion chamber pipe has been used to pack that fuel back in the chamber, and what kind of increase in power it can make.
     
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  6. tree monkey

    tree monkey Jon1212 Approved!

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    those pipes kinda get in the way in the woods, do they work on a work saw? yep been there did that.
     
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  7. usmcbuckwild

    usmcbuckwild ONE OF THE GREATEST!

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    To remedy that could you make the pipe to run under the saw, squared off on the bottom so you can set it down and it won’t fall over? More rectangular than round? Take up less space and be more user friendly?
     
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  8. WKEND LUMBERJAK

    WKEND LUMBERJAK ONE OF THE GREATEST!

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    Sounds like a good build thread for some one.
     
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  9. usmcbuckwild

    usmcbuckwild ONE OF THE GREATEST!

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    I would follow that thread
     
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  10. WKEND LUMBERJAK

    WKEND LUMBERJAK ONE OF THE GREATEST!

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    Me to when are you starting it.:D:D:D
     
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  11. tree monkey

    tree monkey Jon1212 Approved!

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  12. usmcbuckwild

    usmcbuckwild ONE OF THE GREATEST!

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    If I knew how, there would already be a thread
     
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  13. Terry Syd

    Terry Syd Pinnacle OPE Member

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    Scott, I see from your grey beard you have aged a bit from when your avatar was taken...
     
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  14. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    Ok ladies, got a bar on the 550xp today and had a chance to run it with @Red97 in a sugar maple log. I used a 20" 3/8 bar and it ran phenomenal, even at full cut. I had a chance to run both of Joe's echos, the 730 hybrid and the 8000 he just worked up. Both ran great! I especially loved the hybrid due to the weight and the power output. Now to get started on a stock 550 vs my worked up one..
     
  15. Red97

    Red97 Jon1212 Approved!

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    Short clip in smaller wood, ran well with the bar buried too. Forgot how snappy these 550s are.

    Might make me go into my 261c....
     
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  16. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    Oh! Joe also showed me his jug today, interesting stuff!
     
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  17. AlfA01

    AlfA01 Powered by Olive Oil and FETA Cheese..

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    That Dolmar blade improved cut time by 10% at least...
     
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  18. Tor R

    Tor R Regular member

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    Most of the modern pro/semi pro Huskies has crankcases for multiple setup, things like heathed system or Trio brake system.
    While a G setup doesnt mather since it's just two holes underneath the flywheel, the setup for the Trio Brake do mather a bit when we're speaking about as good cooling as possible.

    The Trio Brake system looks like this (this is an 346):
    _DSC4189.jpg

    _DSC4282.jpg

    I doubt they sell more then ruffly 5% 550 Trio Brake saws, but all their crankcases has the mounting ears for the brake system, this is how I choose to prepare a 550 case for a build up (Husqvarna has done the same when they upgraded their 560 crankcase):

    _DSC5183.jpg

    _DSC5184.jpg
     
  19. Farmchuck

    Farmchuck Super OPE Member

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    When you do a build up on a 550 what kind of modification do you do to the muffler?
     
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  20. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    I should have cut those ears off on mine when I was working on it. What a pain in the @ss to get the wrist pin out with that thing there!
     
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