Show off your muffler mods

[davidwyby]

Should make 1.21 gigiwatts now.

gigglewatts?

 

[cuinrearview]

gigglewatts?

Maybe. If you're Chinese.

 

[Semotony]

A little deflector mod.View attachment 307268 View attachment 307269

661 didn't breathe free enough thru the picture window, so made a round holed screen lol

 

[Nutball]

View attachment 286154 View attachment 286156 View attachment 286159 View attachment 286160 View attachment 286162
Block off the pto side exit and direct the exhaust out, up, and away. Here are a few 3120’s that see milling, stumping, and felling / bucking duties

Would you do something like this to a 395? I could send you my muffler.

 

[Moparmyway]

Would you do something like this to a 395? I could send you my muffler.

Sure

 

[RI Chevy]

Go BIG or go home! Mean pipes there...

 

[Semotony]

View attachment 307474
661 didn't breathe free enough thru the picture window, so made a round holed screen lol

I forgot it'd been ported when I bought it. The gasket & muff opening from exhaust port were close. The inside had been gutted, but the muffler port was still about 5/8" dia round hole. Dremel opened that to the picture window opening.. Drill press time put about 20 5/32" holes around and it's a joy to operate since the PH broke in a bit over 3 years ago

 

[markds2]

This early cast muffler 088 had a single 14mm outlet, which I think is ridiculous for a 121cc saw!



So I opened it up, ground the factory deflector off and TIG welded on a large @Red97 deflector, and replaced the spark arrestor with some nice coarse mesh (thanks @Kiwioilboiler)

 

[Dieselshawn]

The most recent muffler mod I have is a tree smacked one for the 661.

So far, this cover, along with the Mastermind opened up outlet through the back piece, has made the most power on the dyno.

I have more covers and back piece coming with different hole setups to try on the Dyno Mule.

 

[Ronie]

361 muffler, haven't figured out how I'm going to do the outlet but the hard part is done, what a pain in the....

 

[huskyboy]

361 muffler, haven't figured out how I'm going to do the outlet but the hard part is done, what a pain in the....

View attachment 307738

Damn stihls

 

[huskyboy]

Lookin as bad as a 562 muffler

 

[Woodslasher]

Damn stihls

*cough*5-series Huskies*cough* I kinda like the Stihls with the split muffs like the 026, 034, 044, 046, 066, etc..... Makes getting in them a lot easier.

 

[huskyboy]

*cough*5-series Huskies*cough* I kinda like the Stihls with the split muffs like the 026, 034, 044, 046, 066, etc..... Makes getting in them a lot easier.

Yes. They need to go back to the old style thick metal split halfs. I guess these new style baffles and paper thin mufflers are for emissions/saving weight?

 

[Dieselshawn]

Today I got a decibel meter. Figured I take readings for different sound levels for different muffler mods while it runs the dyno.

An extremely loud muffler defeats the purpose of having a muffler in the first place and possibly not getting any work in town due to possible noise complaints.

Also a restrictive muffler holds back too much of the saw’s potential for making good torque and power for some models. Especially the 661’s so far. 660’s will be tested later.

The 661’s respond very well to muffler mods, including moving the power band more towards 10,000 rpms instead of 9,000.

Today I had some loggers (the owners of this 661) come to my place to see the saw run the machine.

Both of them had their ears covered with their fingers. Both said that this muffler setup is very loud.....



Picture below is the 661 at idle with the above muffler.



This is wide open. The 661 has flatlined the gauge.



Below is me testing my powerful stereo system.
It maxed out at 111 dba but this got complaints coming in from neighbours, not from the saws.

My stereo shakes their house. My garage was all sealed up, but the neighbours still complain about the stereo.



I am a profound deaf person that wears a powerful hearing aid but the saw above at 130 dba is painful to the open ears.

I’m deaf in both ears but wear only one hearing aid. The hearing aid easily acts as a ear plug and limits the sounds going in.

Just a short spurt at wide open is enough to cause pain in the other ear. So even I must wear earmuffs.

 

[Woodslasher]

Today I got a decibel meter. Figured I take readings for different sound levels for different muffler mods while it runs the dyno.

An extremely loud muffler defeats the purpose of having a muffler in the first place and possibly not getting any work in town due to possible noise complaints.

Also a restrictive muffler holds back too much of the saw’s potential for making good torque and power for some models. Especially the 661’s so far. 660’s will be tested later.

The 661’s respond very well to muffler mods, including moving the power band more towards 10,000 rpms instead of 9,000.

Today I had some loggers (the owners of this 661) come to my place to see the saw run the machine.

Both of them had their ears covered with their fingers. Both said that this muffler setup is very loud.....

View attachment 307742

Picture below is the 661 at idle with the above muffler.

View attachment 307743

This is wide open. The 661 has flatlined the gauge.

View attachment 307744

Below is me testing my powerful stereo system.
It maxed out at 111 dba but this got complaints coming in from neighbours, not from the saws.

My stereo shakes their house. My garage was all sealed up, but the neighbours still complain about the stereo.

View attachment 307745

I am a profound deaf person that wears a powerful hearing aid but the saw above at 130 dba is painful to the open ears.

I’m deaf in both ears but wear only one hearing aid. The hearing aid easily acts as a ear plug and limits the sounds going in.

Just a short spurt at wide open is enough to cause pain in the other ear. So even I must wear earmuffs.

The all-new Fart Box muffler cover, perfect for pissing off neighbors and co-workers alike! It can be yours for only $199.99! "Because everybody knows more noise = more power."

 

[Dieselshawn]

The all-new Fart Box muffler cover, perfect for pissing off neighbors and co-workers alike! It can be yours for only $199.99! "Because everybody knows more noise = more power."

How about a cackling 661?

 

[Moparmyway]

How about a cackling 661?

View attachment 307750

How’d that do on the dyno compared with the muffler ?

 

[Dieselshawn]

How’d that do on the dyno compared with the muffler ?

I’ve not tried that yet. That was just idling. I was a bit worried that having nothing muffling the sound would be pretty nasty.

I did that once with a Chevy 350 on the engine stand years ago in my teenage years.

At WOT, two 16 inch flames coming out of the manifolds had my buddy and me sick to the stomach from the power pulses.

Unless that was the fumes, I’m not sure.

I’d probably try it anyway. For science for OPE

 

[Woodslasher]

I’ve not tried that yet. That was just idling. I was a bit worried that having nothing muffling the sound would be pretty nasty.

I did that once with a Chevy 350 on the engine stand years ago in my teenage years.

At WOT, two 16 inch flames coming out of the manifolds had my buddy and me sick to the stomach from the power pulses.

Unless that was the fumes, I’m not sure.

I’d probably try it anyway. For science for OPE

Yah right, that's just what you'll tell your pissed off neighbors. "It's for science 'n' stuffs!"