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Thread: Echo CS-400 Chainsaw Muffler Mods

  1. 03-19-2010, 09:31 PM #1
    Team FAST
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    Echo CS-400 Chainsaw Muffler Mods

    I modified the muffler on my Echo CS-400 Chainsaw, mostly based on recent recommendations provided by many individuals posting in other threads on this forum.

    However, I thought it might be interesting to quantify the airflow differences of the mods using a Superflow SF-110 flowbench. You can see how the various pieces of the muffler contribute to the airflow results, as well as a direct before/after comparison. The attachments tell the story.

    I have a powerpoint file of all these attachements if anyone wants a copy.

    Enjoy! Comments welcomed/appreciated.

    -erik
    Attached Images Attached Images
    Last edited by Team FAST; 03-19-2010 at 09:35 PM.
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  2. 03-19-2010, 09:33 PM #2
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    Echo CS-400 Muffler Mods

    Here's the next five slides in my presentation.
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  3. 03-19-2010, 09:34 PM #3
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    Echo CS-400 Muffler Mods

    Here's the last slide!
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  4. 03-19-2010, 09:41 PM #4
    keith811
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    nice work,

    I just drilled a 1/2" hole in the front of my muffler. doesn't look the best but works great. I thought I was going to have to cut out a bunch of stuff from inside the muffler but the only thing in it was one little deflector right under the stock outlet so now the exhaust has a direct outlet square in front of the port..
    C.S.A. (confederate southern attraction)
    good ol' boys playin' good ol' music

    Husqvarna 455 muf mod
    Homelite XL 925 (thanks to Scooterbum and Ol' Doc)
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  5. 03-19-2010, 10:01 PM #5
    caotropheus
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    Team Fast

    Very nice indeed. I like the equipment you used to make the silencer transformations. It is much more exact than using empirical measurements.
    Stihl 460
    Stihl MS 270
    Echo CS 341
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  6. 03-19-2010, 11:19 PM #6
    Hddnis
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    Thanks for sharing that with us. Rep sent.



    Mr. HE
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  7. 03-20-2010, 12:22 AM #7
    Terry Syd
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    Deflector

    Thanks for doing that in depth analysis of the muffler mod and showing us the results. Rep sent.

    I note that the flow continued to increase when the deflector was taken off. Perhaps you may want to look at the area of the deflector opening.

    When I was doing the calculations on my new 450 Husky, I found that the opening of the deflector was the limiting factor. After I opened up the deflector outlet, the outlet inside the deflector then became the limiting orifice (which was then modified so that the deflector outlet again became the limiting factor).

    When I opened up the area inside the deflector I drilled three holes that would direct the flow towards the outlet of the deflector. That was done in an attempt to prevent turbulence inside the deflector which could increase resistance to flow. - Thanks again for the PP presentation.
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  8. 03-20-2010, 12:54 AM #8
    caotropheus
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    After Terry's post, I would like to emphasize that the spark arrest net clogs very easily in Echo saws. Usually fellows around here open it up and let the exhaust gases flow out freely. Take a look at my Echo 341.


    Echo CS-341 review
    Stihl 460
    Stihl MS 270
    Echo CS 341
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  9. 03-20-2010, 08:22 AM #9
    Hddnis
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    The spark screen can clog up, but some of us don't have the option of removing it.




    Mr. HE
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  10. 03-20-2010, 08:44 AM #10
    XJPete87
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    Nice job.. Love the actual flow bench numbers. How do you guys enlarge the holes internal to the muffler? Do you split the cases? mine are brazed together and seemed like a real PITA to seperate..
    My Saws
    STIHL MS-440 MAG
    STIHL MS-260 Pro
    STIHL MS-200T
    Echo CS-370 - Muff Modded
    Echo CS-510EVL
    Echo CS-400EVL
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  11. 03-20-2010, 12:33 PM #11
    Team FAST
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    I did split the cases and it was a real PITA. The two halves are furnace brazed together and the factory and there is a spot braze on center of the intenal baffle holding it to the outside can as well. I ended up using a disc sander and sanding off the outer lap seam. Then I had to carefully braze the assembly back together as a butt joint.

    I think the mods could be accomplished without disturbing the outer case assembly. However, enlarging the internal baffle holes like I did might prove difficult.

    I chose to provide flow data for each component in the muffler assembly so you can see the redecution from each indivudal piece. I am running it with the screen on, to keep things reasonably safe and forestry compliant.
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  12. 03-20-2010, 12:35 PM #12
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    Quote Originally Posted by caotropheus View Post
    After Terry's post, I would like to emphasize that the spark arrest net clogs very easily in Echo saws. Usually fellows around here open it up and let the exhaust gases flow out freely. Take a look at my Echo 341.


    Echo CS-341 review

    I happen to have a CS-341 saw as well (really love it) and I noticed that mine also has a CAT muffler. I also noticed that the Echo CS-3400 has an earlier non-cat muffler which is a bolt on swap. Looks like I'll be doing another flowbench comparison soon
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  13. 04-15-2010, 10:34 AM #13
    malador
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    I subscribed to this forum just so I could see your slides. Nice job! I copied everything you did, plus enlarged the deflector holes. Before the 18 bar was almost more than the motor could handle, not anymore!
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  14. 09-03-2010, 06:06 PM #14
    HLC03
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    Thats hilarious. I subscribed to arboristsite just to see the slides of this mod as well. Team FAST, NICE JOB! The Echo CS-400 is my first and only chainsaw so far. I love it. I really want to do some mods to the muffler, but all the brazing and welding of stuff is way out of my mechanical reach. What can I do to my CS-400 saw with basic tools and maybe a drill and dremel tool? Can you help me?
    Thanks A LOT in advance.
    Adam
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  15. 09-03-2010, 06:22 PM #15
    mweba
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    Wish I had toys like that. Would be interesting to see how a competeing manufacturers muffler stacks up against the cat echo.
    On my cs-450p the cat sits to one side so bypassing it was easy. Unlike your model which sits in the center. These saws respond well to this mod.
    Looking for a clean, running Husky 435. Shoot me a PM if you have one to spare.

    Quote Originally Posted by A Mastermind View Post
    Oh hell yes. I'm in for a ported and heavily modded pie.
    Quote Originally Posted by Stumpys Customs View Post
    The term fast and tight can be relative. Fast and Tight for me may be too loose & slow for you.
    Quote Originally Posted by blsnelling View Post
    Ok ok ok! So it's just The Ugly One that I'm scared to get caught in the dark with!

    Mitch
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