Show off your muffler mods

[Agent Smith]

Added a second port to the 044.

 

[Ketchup]

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I’ve been wanting to make a curved pipe like that for a long time. Do you think you could create a full 360 degree spiral pipe? A longer pipe seems to improve performance but isn’t practical for a work saw. But if you could coil it to keep it under the hood…

I do realize that a long pipe and an expansion pipe are different and that a tuned expansion pipe will produce more power. Expansion pipes just aren’t practical for a work saw.

 

[Maintenance Chief]

Heayed handle options

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[Evan03]

I think it all matters in the world of harmonic 2 stroke exhaust tuning.
Id, wall thickness, length, straight, curved, chamber, no chamber,

Ive slightly eyed doing another pipe staying away from muffer bolt and making a full circle I think I can with slight tighter shorter pie cuts.
By Short I mean more curve per pie. 17-20deg vs the normal 12-15 pie.

12deg virtually had no growth when welded to a square cut. Well a 12deg pie is only 6deg cut.

Well see what the 44 gets. It seems to have liked the spark box but I havent cut with it yet

 

[Evan03]

Got the 44 muffler buttoned up.


Will do some firewood cutting in the next few days to see how it goes.

 

[B440]

Milling extension.

 

[huskihl]

Milling extension.
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Put one of those on the carburetor and you could cut underwater

 

[Evan03]

Any power increase with the extension?

I think it will run for about 3 seconds under water maybe slightly longer than a urban snorkel on a Toyota

 

[B440]

Any power increase with the extension?

I think it will run for about 3 seconds under water maybe slightly longer than a urban snorkel on a Toyota

I fired it up in the garage without the bar attached. With or without the extension, it runs lean because the 1/2" pipe I.D. is larger than oem, so I need to tune richer. I probably should've used 3/8" pipe. I'm not ready to make more slabs yet. There's snow on the ground so it might be awhile.

 

[Partner]

Another complicated muffler mod on MTD

 

[Shane¹]

Muffler was missing deflector so opened up the hole and made up one out of some scrap metal

 

[Maintenance Chief]

Muffler was missing deflector so opened up the hole and made up one out of some scrap metal View attachment 366248

That thing has seen some action.

 

[Canadian farm boy]

Dolmar 6400 muff for a 7900 conversion
Opened it up, took all the junk out and put it back together. Opened the stock outlet up as big as I could with still being able to use a spark screen if desired. Now it’s an empty can with a bigger inlet and outlet.

 

[Canadian farm boy]

MS462. Removed the entire baffle, opened the stock outlet up with still being able to use a spark screen if needed

 

[huskihl]

Dolmar 6400 muff for a 7900 conversion
Opened it up, took all the junk out and put it back together. Opened the stock outlet up as big as I could with still being able to use a spark screen if desired. Now it’s an empty can with a bigger inlet and outlet.View attachment 367875View attachment 367876View attachment 367877

You can almost make another muffler out of the guts

 

[TreeLife]

I never cared for that SLR nonsense

 

[pbillyi69]

have any of you opened a muffler up and suffered a loss of performance?

 

[Ketchup]

Maybe. Usually I just stop seeing gains and it keeps getting louder.

 

[Partner]

This will happen without re-adjusting the carburetor

 

[pbillyi69]

Maybe. Usually I just stop seeing gains and it keeps getting louder.

i would think that would be the case eventually. but where is the line when is enough, enough.