Author Topic: Poulan muffler mod  (Read 1845 times)

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Re: Poulan muffler mod
« Reply #10 on: October 29, 2016, 07:03:06 pm »
I may put 2 or 3 small vents on the bottom front. Will taking out the diffuser make a difference, even after being drilled out?


 -Efisher26-
If you are making vents on the front of the muffler than I doubt that removing the diffuser will make a big difference.
PP 505, 475, 445.

Offline fossil

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Re: Poulan muffler mod
« Reply #11 on: November 23, 2016, 01:40:20 pm »
A good way to tell if there's any difference is to video a cut or two and check the time on the video.

Do a mod and cut, same sharp chain and bar, same wood. That will give you an indication of any improvement.

Louder isn't always faster. It's always good to do a timed reality check.

I don't see anyone doing that and posting it.
Tim
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Re: Poulan muffler mod
« Reply #12 on: November 23, 2016, 08:22:19 pm »
Tim's right on before and after to see if you made any gains.

I quit doing before and after videos 6-8 years ago because I already been there done that. All of this was back in the Racesaws site  days before this site.

Best I seen was 23% faster cuts with a 290 with 30min muffler mod and carb retune.  18% with the MS390. The poulans like here we are talking about are less then that.  But still gains are made with letting them breath.  I just dont care enough now days to time each one anymore.

Just like I know there is gains to be made in my 415 445 mufflers. But they cut so sweet and quite now and wont mess with them. I like quite saws myself. ;)
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Re: Poulan muffler mod
« Reply #13 on: November 23, 2016, 10:22:00 pm »
I like. My muffler mods but I should do like Tim has suggested and time them before and after.    I still like my double barrel look the best.   Just a personal preference.
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Re: Poulan muffler mod
« Reply #14 on: November 25, 2016, 10:25:29 am »
Muffler mod testing by Brian aka Timberwolfe from the past days long gone. Page 2 shows results with graphs and % of gains etc with different size opening etc. So glad I saved this info from back then or it would be lost now, with pics.

Page 1 was showing muffler mods by Roger and using spark screens.

http://chainsawrepair.createaforum.com/ported-saws/removing-spark-screens-does-it-make-a-difference/
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