661R Fever ...it's here!!!

[blsnelling]

You're comparing modded 660 to stock 661. How many guys here don't MM their saw? If your 660 was stock, I might agree.

 

[mdavlee]

Try the 661 stock first. It won't be at that much of a disadvantage. Seems the mufflers on them aren't near as restricted as the 660 was.

 

[Moparmyway]

Opening the 661 makes a difference. The 661 just has a deflector inside, no baffle.

 

[Moparmyway]

You're comparing modded 660 to stock 661. How many guys here don't MM their saw? If your 660 was stock, I might agree.

Brad, with the 660 having slightly more displacement and his muffler being modified, I still believe a stock 661 will beat it.

IIRC, the rat trap baffle is still installed on his 660, and even if the baffle was removed, the 661 will still beat it

 

[redbull660]

I have observed a 1-1.5 second LOSS in time by removing the baffle on my 461 and 660. Removing the baffle on a stock 461 or 660 seems to be a BAD idea.

This may not be the case with a ported saw. But stock saw...that is what my testing has showed...bad idea removing baffle. HOWEVER I haven't tested just putting a small hole in the solid plate of the 660.


661 stock vs 660 muff modded should be interesting.

 

[bryanr2]

Yep.......but you better get em quick. They had 8, I got 2 of those.

Mine is coming from PA. Ryan was able to get a better deal on the r version than i could get on the standard model.... plus we dont have Rs here and I despise the big dealer here.

 

[blsnelling]

Brad, with the 660 having slightly more displacement and his muffler being modified, I still believe a stock 661 will beat it.

IIRC, the rat trap baffle is still installed on his 660, and even if the baffle was removed, the 661 will still beat it

I believe you are correct. However, I also know how people are. People will see the difference being less than it really is and take it out of context. I simply think you're better off to compare apples to apples.

 

[blsnelling]

I believe you are correct. However, I also know how people are. People will see the difference being less than it really is and take it out of context. I simply think you're better off to compare apples to apples.

Do your 661 stock to 661 muffler modded tests independently from this test.

 

[Moparmyway]

I have observed a 1-1.5 second LOSS in time by removing the baffle on my 461 and 660. Removing the baffle on a stock 461 or 660 seems to be a BAD idea.

My bubble top 066 gained about the same with a re-tune after the baffle was removed.
I don't remember if you did or not, but wasn't there a question of re-tuning after modifying your muffler before re-testing it ?

That's whats nice about M-Tronic and Autotune, no need to re-tune and just about every cut is dialed in

 

[MustangMike]

Both for the saw & M-Tronic, however U do it, I would break in the 661 first. A brand new saw may not run like it should.

 

[redbull660]

alright. I will do the 28 and 36" tests Muff modded 660 vs stock 661 (it's broken in...approx 15 tanks) . Then i'll muff mod the 661 and do 661 vs 660 (both muff modded). there settled


hopefully i don't run outta wood

 

[MustangMike]

Sound great, thanks, looking forward to it.

You must have a pretty good feel for how it is going to go after 15 tanks, but I'm looking forward to seeing the results.

 

[maulhead]

Sound great, thanks, looking forward to it.

You must have a pretty good feel for how it is going to go after 15 tanks, but I'm looking forward to seeing the results.

X2, me also!!

 

[SAWMIKAZE]

This stuff confuses me..for a 1 second loss in cut speed ill keep guttin my mufflers to let the heat out.

 

[redbull660]

well shouldn't a muffler should be at a certain temp to burn the gases or else you have carbon build up. As far as the 660 baffle goes. I look at it like this.

Stihl had the same baffle in the old 066 that they do today. My understanding is they had that baffle in the original design, even BEFORE the EPA regs. They met the epa regs by making the port smaller. ie. .625 down to .375. and also changing the cylinder some. But that baffle has never changed. That's my understanding.

You do need some back pressure in most systems. Not all, but most. 461 and 660 seem to need it. You can get it from a baffle or you can take out the baffle and get it from restricting the exit port size ie. From what i can tell it's better to get the back pressure from the baffle and open up the exit port size.

 

[SAWMIKAZE]

well shouldn't a muffler should be at a certain temp to burn the gases or else you have carbon build up. As far as the 660 baffle goes. I look at it like this.

Stihl had the same baffle in the old 066 that they do today. My understanding is they had that baffle in the original design, even BEFORE the EPA regs. They met the epa regs by making the port smaller. ie. .625 down to .375. That's my understanding.

Cool man , i dont really look that far into it , i gut em' and run eth free gas and lucas or belray mixed at 32:1 and get to work.

 

[SAWMIKAZE]

well shouldn't a muffler should be at a certain temp to burn the gases or else you have carbon build up. As far as the 660 baffle goes. I look at it like this.

Stihl had the same baffle in the old 066 that they do today. My understanding is they had that baffle in the original design, even BEFORE the EPA regs. They met the epa regs by making the port smaller. ie. .625 down to .375. and also changing the cylinder some. But that baffle has never changed. That's my understanding.

You do need some back pressure in most systems. Not all, but most. 461 and 660 seem to need it. You can get it from a baffle or you can take out the baffle and get it from restricting the exit port size ie. From what i can tell it's better to get the back pressure from the baffle and open up the exit port size.

I gotta give you credit though , you have way more patience than i do , this all makes for a hell of a read .. its interesting for sure.

 

[Moparmyway]

well shouldn't a muffler should be at a certain temp to burn the gases or else you have carbon build up. As far as the 660 baffle goes. I look at it like this.

Stihl had the same baffle in the old 066 that they do today. My understanding is they had that baffle in the original design, even BEFORE the EPA regs. They met the epa regs by making the port smaller. ie. .625 down to .375. and also changing the cylinder some. But that baffle has never changed. That's my understanding.

You do need some back pressure in most systems. Not all, but most. 461 and 660 seem to need it. You can get it from a baffle or you can take out the baffle and get it from restricting the exit port size ie. From what i can tell it's better to get the back pressure from the baffle and open up the exit port size.

This might make sense, except when I take off any of my mufflers and look inside. Since I have no baffles, and my muffler exit isn't white but cruddy and gooey black, I am willing to wager that my saws run pretty cool. I have zero carbon build up on the piston crown, no carbon on the rings, and almost a mirror finish in the exhaust port

 

[redbull660]

The other thing I found when I ran no baffles is I had to adjust the carb quite a bit richer. Burned more gas. Didn't get any more power.

The power might change if there was more air coming into the system via like a max flow setup?

They do sound nicer with out the baffle, that's for sure

cooler - The only way to be sure is to put a thermo gun on the jug after the cuts with each muffler setup.

faster - but just removing the baffle proved to be slower on both the 461 and 660

 

[Moparmyway]

Which 044 is running hotter ?
Dont need a temp gun when you have witness marks