Tree Monkey 461 R&D muffler tests

[Redbull661]

Scott just finished porting this one and figured we'd try some different muffler combos.

7pin, 28" tsumura, 28" 063 3/8 stihl full comp square

Nice 2 second gain in the cant.

 

[dall]

Scott just finished porting this one and figured we'd try some different muffler combos.

7pin, 28" tsumura, 28" 063 3/8 stihl full comp square

Nice 2 second gain in the cant.

you really need to sweep for scott before he falls

 

[Deets066]

Poke some more holes in it then...

 

[Shanesaw80]

That thing is awesome!!

 

[andyshine77]

Good stuff! It's nice to see guys still at it, adding new info. These results back up Timberwolves findings from, I don't know 07 or so. At that time "if I remember correctly" he saw gains with mufflers open up to 120% the exhaust port area. However the gains from 80% up or so weren't much, but noise sure increased. So for the most part if you want power, go big! lol. Not sure how this effects strato engines, I would expect there to be a difference with Strato engines.[emoji111]

For those who weren't around at the time Timberwolf was the real deal, he totally engineered things from a scientific and experimental standpoint, he even had a working dyno he made. The good old days.[emoji17]

 

[drf256]

Great test Julian, as usual. Thank you for sharing.

I’m not sure why people think smaller outlets will help power in a mufflered saw. I get it on a pipe.

It’s all about sacrificing noise for power.

It would be cool as hell to have seen what a decibel meter woulda said for each one. I bought one for testing (they are cheap-actually bought to see what decibel my in-laws reach at gatherings) and as usual, haven’t had the time to play.

 

[Stihl Potlicker]

you really need to sweep for scott before he falls

it's padding, those saw are such strong it practically has @tree monkey doing a head stands

 

[Cut4fun]

Good stuff! It's nice to see guys still at it, adding new info. These results back up Timberwolves findings from, I don't know 07 or so. At that time "if I remember correctly" he saw gains with mufflers open up to 120% the exhaust port area. However the gains from 80% up or so weren't much, but noise sure increased. So for the most part if you want power, go big! lol. Not sure how this effects strato engines, I would expect there to be a difference with Strato engines.[emoji111]

For those who weren't around at the time Timberwolf was the real deal, he totally engineered things from a scientific and experimental standpoint, he even had a working dyno he made. The good old days.[emoji17]

I saved all that info with pics in a thread. Before it was lost. Thanks for the reminder.

 

[Cut4fun]

@andyshine77 in here with graphs etc. http://chainsawrepair.createaforum.com/ported-saws/removing-spark-screens-does-it-make-a-difference/

 

[srcarr52]

Quad port... sheesh! You should have made a cut without the front cover.

 

[deye223]

Hmmmm I wonder if this will work on a stock 461 with just a timing advance ......

 

[andyshine77]

@andyshine77 in here with graphs etc. http://chainsawrepair.createaforum.com/ported-saws/removing-spark-screens-does-it-make-a-difference/

Awesome! Looks like I remembered at least some of it correctly lol.[emoji106]

 

[ferris]

@Redbull661
Did u tune the saw after each change?

 

[sawmikaze]

Everyone is gonna have a quad port MUFF on their 461s now.

 

[drf256]

Did the brake handle need to be relieved to clear the top deflector?

 

[MustangMike]

Impressive results, but I would caution against applying them to all saws.

TM is expert at porting saws, and his saws need all the flow they can get.

I have a few saws that lost torque when I opened up the mufflers too much. Since I like to lean on a saw, I changed them back.

I believe that each saws has a sweet spot that will depend more on it's porting more than on any formula. (will depend on cylinder porting and ignition timing)

Also, I believe TM runs screens on all his ports??? (that would reduce flow about 50% compared to the unscreened ports some builders use?)

I put on my Motorcycle Helmet and lowered the face shield to prepare for the backlash!

 

[blsnelling]

I'm of the opinion that a muffler should simply be made to flow. These aren't tuned pipes. Open it up based on your tolerance of volume. I haven't measured exhaust area in nearly a decade.

 

[RI Chevy]

Did you just go by feel Mike? Or did you do timed cuts for your testing?
@MustangMike

 

[RI Chevy]

Excellent tests. Thanks for sharing.
Time first some new oak cants.

 

[MustangMike]

Jeff, I can feel the difference in torque, which I'm sure would translate to cut times.

I'm sure the best running saws will have very open mufflers, as mine do, but it does not work on every saw.

If you want, I'll bring some mufflers for testing at the CT GTG, and I'll let your or Mason or Dan run them so no one cries foul.