Dolmar 5105 Muffler Mod.

I decided to take the muffler off of my 5105 and bring it to work today. Not that the saw really needs any more power, but I wanted to remove the CAT and see what these mufflers are made of. The design of the muffler is pretty neat I have to say. Very unique. The metal is of good quality stainless steel. Here's a break down of what I did.
1. Removed muffler from saw
2. Removed the 2 outside heat shields
3. I used a belt sander to remove the very edge of the muffler and split the 2 halves. I first tried bending that lip around. That is about impossible.
4. I used a very small 1/8" delta arbor with a cut-off wheel to break the 3 welds on the CAT from the muffler and then knocked it out of the mounting hole.
5. NOT pictured. But I drilled 4- 5/32" holes on the top portion of the muffler where the exhaust flows. This should help it breathe better.
6. Put both halves in the vice and TIG welded the edges together. I never used any filler rod. Just tigged them up. The metal is wonderful for TIG'ing.
7. Installed both heat shields back on muffler
8. Installed muffler to saw.

I went out and made a few cuts after I installed it. The saw isn't any louder or anything, but the response and power is a little bit better. Mind you this saw is only 2 tanks old. Not even close to being broke in. But I want it to get broke in with the muffler that it will wear for the rest of its life.

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more. Sorry for the pic quality. I just had my blackberry at work. LOL

Great Post! Thanks. I've never see a cat on a Chainsaw before.

well done just be carefull handling/work with the CAT material

Serg

husq2100 said:

well done just be carefull handling/work with the CAT material

Serg

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Why.... Does sniffing the grinding dust cause cancer in CA? Hope so. I need to die of something!

New Saw

Ordered a 5105 today. Anxious to see just how good these saws are.

Putting Stihl RSC chain on.

Muff mod will be very soon. I don't like that disk in the muffler. Probably has some sort of tracking device so the government can trace what I've been cutting down.

So I know when I worked in the auto industry the scrap guy gave us a higher rate on cats. Do these cats have any precious metals that could possibly go for a marginal fee I know it couldnt be much but I dont believe in just throwing away precious metals.

Thorcw said:

So I know when I worked in the auto industry the scrap guy gave us a higher rate on cats. Do these cats have any precious metals that could possibly go for a marginal fee I know it couldnt be much but I dont believe in just throwing away precious metals.

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Dunno what metal it was but it went straight to my companies scrap bin. All the metal there is recycled. I don't think it's the same material as auto cats though.

Cant be much different since it is a reaction

Thorcw said:

So I know when I worked in the auto industry the scrap guy gave us a higher rate on cats. Do these cats have any precious metals that could possibly go for a marginal fee I know it couldnt be much but I dont believe in just throwing away precious metals.

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Cats work with the help of platinum. Just give your girlfriend a platinum ring and she will drag you of to church right away! Simply put it is more precious than gold! But the platinum amount in cats is very small. It is just vaporised onto the honeycomb. But if you collect enough maybe a ring will be in your future. But don't forget if it doesn't work out she gets to keep it!

7

Definitely different looking!!

Who needs a muffler anyways. Might as well just take it off I'm sure it limits the saw's abilities it's probably best to just run'er with open headers because no back pressure = mo' powa.


Muffler looks neat. Thanks for sharing so far!!!!

Platinum

7sleeper said:

Cats work with the help of platinum. Just give your girlfriend a platinum ring and she will drag you of to church right away! Simply put it is more precious than gold! But the platinum amount in cats is very small. It is just vaporised onto the honeycomb. But if you collect enough maybe a ring will be in your future. But don't forget if it doesn't work out she gets to keep it!

7

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A ring on their finger will lead to a ring in your nose if you aren't careful!

And after marriage and church watch her a$$ grow and your bank account shrink.

LOL. I gave my wife a Platinum ring almost 10yrs ago. They no longer carry platinum rings at most jewelry stores now. When she takes it in to get it cleaned and make sure the stones are secure the ladys there usually go googly eyed over it.

It has almost trippled in value since I bought it though. :jawdrop:Guess it was a good investment. FOR HER

porsche965 said:

A ring on their finger will lead to a ring in your nose if you aren't careful!

And after marriage and church watch her a$$ grow and your bank account shrink.

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Hey porsche. Obviously you have your priorities all sorted out!

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I need to do this mod to mine.