Author Topic: Muffler mods  (Read 811 times)

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Offline JOE.G

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Muffler mods
« on: December 25, 2012, 04:04:47 pm »
I hear of people removing the Spark screens, does it make a difference? In Power? In sound? Pros? Cons?

My 562 XP doesn't have one but the rest of the equipment in my sig below does, Should I remove it from any of them? Should I leave it in some of them? Thanks
Husqvarna 562XP Woods Ported with .025 pop up Muffler Mod
Husqvarna Rancher 55 2005
Husqvarna 450 Anniversary Edition 2010
STIHL 009 1998
STIHL HT 131 Pole Saw 2012, FS 110 R Trimmer 2010, BR 600 Magnum Blower 2012

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Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #1 on: December 25, 2012, 04:18:32 pm »
I have a bunch of Mufflers that I have modded and I always leave a spark screen in.  The reason is because if you cut on National Forest land or BLM land it is required by law that they be in there to prevent fires.   If you are looking for all out performance then removing it does help but I would be willing to bet if the spark screen you have is good and clean that without doing a complete muffler mod you may not even notice the difference.  What I like to do is open up the baffles inside the muffler and open up the outlet for the muffler but leave a spark screen in.  Opening up the muffler though will definitly make it louder.  But to answer your question removing the spark screen does help improve performance.



PP 505, 475, 445.

Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #2 on: December 25, 2012, 04:27:08 pm »
On this one if you look real close into the pipe you can see the screen in there.

Also I forgot to mention that anytime you change the flow of exhaust through a muffler you need to change the fuel mixture setting also because it will affect it.

PP 505, 475, 445.

Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #3 on: January 12, 2013, 11:58:02 pm »
Thought  would show another MM.  This is on a J-red 670 and once again there is a spark arrestor screen inside.  I used one from a Poulan muffler that wraps around the baffle.

PP 505, 475, 445.

Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #4 on: January 13, 2013, 12:04:08 am »
This Muffler Mod is on a Poulan 335.  You can see I cut a slit in the side of the muffler and then open it up with a screw driver and pliers.   If you look real close you can see the screen inside.

PP 505, 475, 445.

Offline JOE.G

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Re: Removing Spark Screens, Does it make a difference?
« Reply #5 on: January 13, 2013, 07:02:39 am »
 I see you like to keep your screens in, Some people swear they restrict others say they don't.
Husqvarna 562XP Woods Ported with .025 pop up Muffler Mod
Husqvarna Rancher 55 2005
Husqvarna 450 Anniversary Edition 2010
STIHL 009 1998
STIHL HT 131 Pole Saw 2012, FS 110 R Trimmer 2010, BR 600 Magnum Blower 2012

Offline Al Smith

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Re: Removing Spark Screens, Does it make a difference?
« Reply #6 on: January 13, 2013, 07:04:42 am »
TW AKA Brian W. of Ont where ever  he went had a formula of how much to increase the size of the exit hole to equal about the same size were the screen left in a standard size hole .

As far as to screen or not to screen there are mixed opinions on that subject depending on local .In this portion of Ohio you'd be hard pressed to start a fire unless you were in the middle of a wheat field in July .If you were I'd well imagine you'd have a very upset farmer to deal with .Probabley not a good plan .

Offline TORX

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Re: Removing Spark Screens, Does it make a difference?
« Reply #7 on: January 13, 2013, 09:08:23 am »
For my personal use. I remove the spark screen. But if i'm muff moding someone elses saw, I'll put a screen in the extra port. Just because....

Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #8 on: January 13, 2013, 12:05:20 pm »
I see you like to keep your screens in, Some people swear they restrict others say they don't.

Well Joe I do keep them in because these saws will be used on Public land and it is required by law.   But I do believe that if the baffle is opened up and the exit hole is opened up to, if not larger than the size of the exhaust port on the cylinder, that I will still see decent gains in performance.   That is one reason I try to use screens that wrap around the baffle 360 degrees because it gives alot of area for the exhaust to flow through.
PP 505, 475, 445.

Offline 3000 FPS

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Re: Removing Spark Screens, Does it make a difference?
« Reply #9 on: January 13, 2013, 12:12:57 pm »
Ok I decided to take a picture of the type of screens that I like using the most.



PP 505, 475, 445.

 

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