Chainsaw Repair

Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => Welding Shop => Topic started by: alsled on November 20, 2013, 07:42:54 pm

Title: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 07:42:54 pm
390 xp, doner parts from a old 350
Title: Re: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 07:43:30 pm
390xp

Title: Re: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 07:45:24 pm
365 special muffler, getting it ready for a Hyway BB kit.
Title: Re: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 07:46:25 pm
Lets go square on a 394

Title: Re: Dual port muffler mods, various.
Post by: Cut4fun . on November 20, 2013, 07:47:18 pm
Nice 
Title: Re: Dual port muffler mods, various.
Post by: 3000 FPS on November 20, 2013, 07:56:42 pm
Alright alsled that is what I like seeing.   Some good ole mods using the Mig.

Here is one I did.   I took two round pieces of pipe and cut a section out of both of them and then welded them together where they were cut.  Then I welded them to the muffler.   I have a small Hobart mig welder that I used for this.

Title: Re: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 08:03:36 pm
Nice work 3000 fps, The 390 muffler I did with a oxy acy torch, I was to lazy to take the .035 wire out of the mig and put .023 in.

The only concern I would have with your mod is, burying the outlet in a bunch of sawdust if cutting low to the ground, maybe restrict it?
Title: Re: Dual port muffler mods, various.
Post by: 3000 FPS on November 20, 2013, 08:18:14 pm
Nice work 3000 fps, The 390 muffler I did with a oxy acy torch, I was to lazy to take the .035 wire out of the mig and put .023 in.

The only concern I would have with your mod is, burying the outlet in a bunch of sawdust if cutting low to the ground, maybe restrict it?


That is true but I doubt that I would ever use this saw for cutting a stump flush.    I have fallen a few trees with it but I was high enough that it did not present a problem.
Title: Re: Dual port muffler mods, various.
Post by: alsled on November 20, 2013, 08:27:21 pm
Understood, I don't fall many trees, but it was just in the back of my mind when doing mine.
Title: Re: Dual port muffler mods, various.
Post by: 3000 FPS on November 20, 2013, 08:31:53 pm
I will go out with the brother in law to cut fire wood and we will fall about 15 trees every year.   We only do 5 at time and do it in different trips.
Title: Re: Dual port muffler mods, various.
Post by: Al Smith on November 20, 2013, 09:58:16 pm
Muffler mods are another subject there must be ten thousand ways to do it .You can braze a shroud on ,it won't melt off .Way back when we brazed headers for sprint cars running alkie and they never melted off .

This shiny piece of metal is shrounding on a Stihl 038 AV I twiddled with .
Title: Re: Dual port muffler mods, various.
Post by: 3000 FPS on November 20, 2013, 10:06:41 pm
Muffler mods are another subject there must be ten thousand ways to do it .You can braze a shroud on ,it won't melt off .Way back when we brazed headers for sprint cars running alkie and they never melted off .

This shiny piece of metal is shrounding on a Stihl 038 AV I twiddled with .


You are right there is a bunch of different ways for muffler mods.   In fact I like that we have already shown 3 different ways to do a muffler mod.   Mig welding, Gas welding, and brazing.
Title: Re: Dual port muffler mods, various.
Post by: 660magnum on November 20, 2013, 10:38:11 pm
All my muffler mods over the years have been brazed. Never had one change any after use.

The brass will not stick to Black oxide, cadmium, or (naturally) chromium. They must be thoroughly clean to bare metal before lighting the torch.
Title: Re: Dual port muffler mods, various.
Post by: 3000 FPS on November 20, 2013, 11:49:09 pm
How about silver soldering for muffler mods.   Anybody use that.
Title: Re: Dual port muffler mods, various.
Post by: 660magnum on November 21, 2013, 12:10:15 am
I at least thought about it but never actually tried it as I have both and the procedure is close to the same.
Title: Re: Dual port muffler mods, various.
Post by: stihls066 on November 21, 2013, 11:09:45 pm
no welder so this is how I do it. never had one come loose.
Title: Re: Dual port muffler mods, various.
Post by: Al Smith on November 22, 2013, 04:21:37 am
The only thing I use silver solder on is either refridgeration tubing or making carbide lathe tools .The danged stuff is expensive .

Brass has a lot of uses .There are a lot of alloys depending on the usage .
"Easy flow " is soft and melts at a lower temp .I have some rods that are about the same as
"Ampco " brass ,hard as a rock.I used it to repair a worm wheel feed on a drill press.Fact I've still got a sliver in my thumb from cutting the gear .I also have some brass electrods .I have no idea what they are for,cast iron I suppose in place of nickle maybe .
Title: Re: Dual port muffler mods, various.
Post by: 660magnum on November 22, 2013, 08:23:36 am
Regular brass torch welding rod will not stick to Ampco. It will act like the Ampco is not hot enough up until the Ampco is so hot it makes the zinc burn out of the brass and will never stick.
Title: Re: Dual port muffler mods, various.
Post by: Al Smith on November 22, 2013, 09:55:56 pm
It was hard brass over what was once a cast iron worm wheel not ampco .I've got pictures of it hobbed on an engine lathe of which I embarrassed the dickens out of a young tool and die maker who said it couldn't be done .One old coot toolmaker about my age now just rolled on the floor when I showed the pictures .He said --old Smitty showed you up and all he is is a "sparky " . ;D Gotta love it .