Show off your muffler mods

[Cracker Boy]

I'm actually wondering myself how much hotter the gases are that come straight out the front vs on a side or top deflector. I don't have a temp gun, but I'd bet if it's straight down and out the front that it's maybe 300° F hotter than if it's on the side or top and pointed forward.

That being said, I have several that exit the lower front

I wanted to put it on the left side but was afraid with the heat on a felling cut would be hot on the left hand. Theres not alot of room there for a mod with the flange and muffler being recessed.its just a limbing 50 cc saw its not a 90cc felling saw buried in a cut for a half a tank of full .andy wellman built the same saw for a buddy of mine from west house saws.thats exactly were he put it.thats actually were i fot idea from.my buddy is a logger he uses it daily he hasnt caught the woods on fire, thanx

 

[Deets066]

Straight out the front is the fastest exit for the exhaust gasses. Which is also why it is the fastest and used among race saws.

As for work saws, it's just not worth it. Should be side exit or some sort of deflector if used in the front

 

[Dub11]

I'm actually wondering myself how much hotter the gases are that come straight out the front vs on a side or top deflector. I don't have a temp gun, but I'd bet if it's straight down and out the front that it's maybe 300° F hotter than if it's on the side or top and pointed forward.

That being said, I have several that exit the lower front

Were is @Redbull661 I'm sure he has numbers! And I'm not sure about the rest of you guys but it's so humid around here I have a hard time starting a fire with gas let alone chainsaw exhaust lol.

 

[Cracker Boy]

Straight out the front is the fastest exit for the exhaust gasses. Which is also why it is the fastest and used among race saws.

As for work saws, it's just not worth it. Should be side exit or some sort of deflector if used in the front

Thank you for the answer deets.

 

[Deets066]

Big front exit would be fast for sure. But also a fire startin mfer.

 

[Deets066]

Were is @Redbull661 I'm sure he has numbers! And I'm not sure about the rest of you guys but it's so humid around here I have a hard time starting a fire with gas let alone chainsaw exhaust lol.

I've started a few logs on fire with a ms 250 that I opened straight out the front

 

[TreeLife]

Where is Julian with his thermocouple? What are the exhaust gas Temps on average for a saw?

 

[Deets066]

Where is Julian with his thermocouple? What are the exhaust gas Temps on average for a saw?

I bet 900- 1,000 on the fat side and 1,300 on the lean side

 

[TreeLife]

1300 is knocking on melting aluminum, no?

 

[huskihl]

1300 is knocking on melting aluminum, no?

Bout 1600

 

[huskihl]

1300 is knocking on melting aluminum, no?

Bout 1600

Lemme rephrase that
Aluminum melts at 1200ish. Exhaust gases can be higher due to the aluminum surrounding the combustion chamber acting as a heat sink

 

[Deets066]

1300 is knocking on melting aluminum, no?

Yup, aluminum melts at 1,250. But some engines can hold up at 1300 degrees because of the constant cooling of the fuel

 

[Deets066]

I used to run an EGT RacePak on my sled.

I became awefully familiar with exhaust temps

 

[Cracker Boy]

I have a thermocoupler its in my toolbox in my muti meter bag along with various other meter attatchments so according to what deeets said.if im understanding this correctly the saw will run cooler but exhaust gases will be hotter thats good to know.

 

[Deets066]

I'm just guessing here, but I bet you could run higher egt's on a saw with a box muffler than a sled with an expansion chamber.

No backstuffing of hot gasses with the saw, just hot gas out and fresh charge in.

 

[Deets066]

saw will run cooler but exhaust gases will be hotter thats good to know.

Depends solely on your tune

 

[Cracker Boy]

I'm just guessing here, but I bet you could run higher egt's on a saw with a box muffler than a sled with an expansion chamber.

No backstuffing of hot gasses with the saw, just hot gas out and fresh charge in.

Would that exolain why some run a grunt gasket on a sled

 

[Deets066]

Would that exolain why some run a grunt gasket on a sled

Enlighten me on a grunt gasket.

Most used lead dougnughts

 

[Cracker Boy]

A spacer gasket between cylinder and muffler.i know a guy who puts em on his sleds and saws.aka kinda like the spacer on 064 and 036 imo i think this may be why they run so good.

 

[T.Roller]

View attachment 95492

Big front exit would be fast for sure. But also a fire startin mfer.

View attachment 95493

I will be changing this one out soon. Runs great but it's so loud in the cut and left a big oak smoking lol