361 Shootout

timberwolf · Nov 16, 2010

Have 2 361s and a 361BB on hand so thinking of comparing muffler mods along this line and also the BB vs factory cylinder and piston.

Hope to get some dyno and flow bench numbers as well.

wiskey_6 · Nov 16, 2010

This should be good to sit back an watch.

RTK · Nov 16, 2010

timberwolf · Nov 16, 2010

One thing with the 361 filter is the whole exhaust gets pushed through one small hole in the funnel shaped piece of junk that was pulled out. Very restrictive and a lot of changes in direction and shape of flow.

Trigger-Time · Nov 16, 2010

Thanks TW, Am very glad to here this

I am on my 2nd 361 and it's just now getting broken in.
I saved my 361 MM muffler from 1st 361 and was planing
on doing some testing my self to see if my MM really made
any difference or an I just making more noise.
I have the new muffler to switch out with this one.

But from things you have said I need to remove the muffler guts. correct?

TT

timberwolf · Nov 16, 2010

Your muffler mod will be getting past some of the restriction but the flow will still need to pass through the basket at the inlet of the muffler so there is some potential restriction.

Trigger-Time · Nov 16, 2010

timberwolf said:
Your muffler mod will be getting past some of the restriction but the flow will still need to pass through the basket at the inlet of the muffler so there is some potential restriction.

I was surprised that very little exhaust now comes out of the org port.

Also I guess it's on my end but your pic show up as X
TT

timberwolf · Nov 16, 2010

Not sure why the pics are not comming up for you, they are linked from here on post #60.

http://arboristsite.com/showthread.php?t=154490&page=4

If you look at that junk in the muffler It is pretty clear why the flow would rather go out the side than around through the inner passages.

2000ssm6 · Nov 16, 2010

All the MM I've done on 361s turn them into another saw. Those have got to be in the top 5 of "most choked up saws". :dizzy:

I bet they gain a bit more w/o the internals. :clap:

mtngun · Nov 16, 2010

I love it when you post a project TW. Love your hard data and your logical approach. :clap:

Tzed250 · Nov 16, 2010

Now this will be a good thread...

SawTroll · Nov 16, 2010

timberwolf said:
Your muffler mod will be getting past some of the restriction but the flow will still need to pass through the basket at the inlet of the muffler so there is some potential restriction.

I remember that Andy used to say that the basket had enough (and large enough) holes to not matter, but I always was a bit sceptical about that.

It is a pity that you probably can't include a stock Euro 361 into your test, but I look forward to the results anyway!

blsnelling · Nov 16, 2010

Andy frowned on about anything that wasn't stock or OEM.

madhatte · Nov 16, 2010

I also always wondered about the assertion that those holes were "enough". The angles don't look right to me. I am looking forward to the results of this test.

SawTroll · Nov 16, 2010

blsnelling said:
Andy frowned on about anything that wasn't stock or OEM.

Hmmm - why did he mod 361 mufflers then, and be very public about it?

He also used to talk about modding the muffler of the "strangled" US 260s, to compensate for the power loss.

parrisw · Nov 16, 2010

OOO, a TW thread!! cool. Here is the pics. See if I can help here.

Question for ya TW, are you tig welding your mufflers? Last time I did a muffler was the first time with my new tig, and I had a hell of a time cause the filler was too thick, couldn't find any thinner. So I haven't tried it yet but was going to try to use some mig wire as filler since its sooo much smaller. What do you use?

Gypo Logger · Nov 17, 2010

parrisw said:
OOO, a TW thread!! cool. Here is the pics. See if I can help here.

Question for ya TW, are you tig welding your mufflers? Last time I did a muffler was the first time with my new tig, and I had a hell of a time cause the filler was too thick, couldn't find any thinner. So I haven't tried it yet but was going to try to use some mig wire as filler since its sooo much smaller. What do you use?

No pics yet that I can see. TW great work, but couldn't you have had the common decency to have showcased a Husky! Lol

John

parrisw · Nov 17, 2010

Yukonsawman said:
No pics yet that I can see. TW great work, but couldn't you have had the common decentcy to have showcased a Husky! Lol
John

Working for me John. Not sure what's up.

Gypo Logger · Nov 17, 2010

parrisw said:
Working for me John. Not sure what's up.

Maybe Mntgun can come to the rescue, he's good with this sort of thing, but I can't rule out my computer, although other pics are showing fine.
John

parrisw · Nov 17, 2010

Yukonsawman said:
Maybe Mntgun can come to the rescue, he's good with this sort of thing, but I can't rule out my computer, although other pics are showing fine.
John

Hmm,

anybody else having problems seeing the pics?

361 Shootout

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