C-81 Muffler Fab'd from a used Propane Tank

[Rob R 989]

Afternoon gentlemen had some free time today, so I fabricated a new muffler for my C-81 using a

propane tank, and a variety of pipe fittings 3/4" and 1" from Home Depot. I used the existing mounting

bracket off the old (shot)  muffler as well as the end Tip otherwise everything is new.... The 3/4" pipe

inlet and outlet were "brazed" on with an oxygen and acetylene torch. I also drilled several rows of

holes all around the part of the 3/4" pipe that went into the top of the  tank and closed the far end

(welded a nut across the opening). End result is that it sounds almost exactly like the stock muffler

now we will see how long it holds up.......NOTE: The tanks have two (2) spring valves (like the

one's in a tire tube)..... they are a bit deeper then the one's in a tire tube so I took a piece

of steel rod (same size as the hole) took my small cut-off tool cut a fork in the top of the

rod inserted it into the tank valves screwed the valves out and then blew-out the tank with

my air compressor. Note: you can also depress the valve with a small screw driver and

get like 98% of any gas out. Like anything else you do have to take pre-cautions and be

very careful. You could also fill it with water after the valves are out and then drain.  

Edited January 17, 2017 by rgrottk

[DougC 2,643]

Looks good! You did a nice fabrication there.   

[Wishin4a416 2,560]

Nice job!! It should last quite a while I would think. Are those Yukon Golds in the background?

[Rob R 989]

48 minutes ago, Wishin4a416 said:

Nice job!! It should last quite a while I would think. Are those Yukon Golds in the background?

Yes Yukon Golds from my Brothers Farm,.... delicious.....!

Edited January 16, 2017 by rgrottk

[Wishin4a416 2,560]

24 minutes ago, rgrottk said:

Yes Yukon Golds from my Bros,.... delicious.....!

Ah man Yukons were scarce around here this Fall. Didnt get any. Yum Yum...

[scotty 252]

That muffler looks amazing! Can hardly tell the difference from a nelson.

[Sparky-(Admin) 24,983]

Nice fabrication job!

  What is in the propane tank for a baffle?

  Mike....

[rmaynard 17,102]

24 minutes ago, Sparky said:

Nice fabrication job!

  What is in the propane tank for a baffle?

  Mike....

Mike,

See the next to the last sentence in his first post. I was going to ask the same question until I re-read it.

Quite a bit of handy work. I just can't say enough about guys like rgrottk who can fabricate.

[DennisThornton 4,773]

I'm done similar.  I'm expecting it to last along as a new muffler. 

[roadapples 6,987]

Nice job, and you can still get to the points...

[pfrederi 20,251]

How did you purge the tank before you started cutting on it.  I wold probably blow myself up

[Rob R 989]

2 minutes ago, pfrederi said:

How did you purge the tank before you started cutting on it.  I wold probably blow myself up

Understand your concern pfrederi....The tanks have two (2) spring valves (like the one's in a tire tube)..... they are a bit deeper then the one's in a tire tube so I took a piece of steel rod (same size as the hole) took my small cut-off tool cut a fork in the top of the rod inserted it into the tank valves screwed the valves out and then blew-out the tank with my air compressor. Note: you can also depress the valve with a small screw driver and get like 98% of any gas out. Like anything else you do have to take pre-cautions. You could also fill it with water after the valves are out and then drain.  

[Aldon 4,832]

I have done same by filing a large cotter key flat at the ends and using it similarly to a valve stem remover. A nail or small screwdriver through the top of the cotter key for torque.

Edited January 17, 2017 by Aldon

[ronhatch 410]

Nice work Rob! I wish there were more post that showcased innovative ideas. I bet that outlast a store bought muffler 2 to 1.  A propane tank would also make a great

looking stack muffler. May I ask; Why did you go from a 1" pipe down to a 3/4"? I would think it may increase back pressure???? Just saying.

[Rob R 989]

4 hours ago, ronhatch said:

Nice work Rob! I wish there were more post that showcased innovative ideas. I bet that outlast a store bought muffler 2 to 1.  A propane tank would also make a great

looking stack muffler. May I ask; Why did you go from a 1" pipe down to a 3/4"? I would think it may increase back pressure???? Just saying.

This is the first one I did, soo I was hesitant to put a 1" hole in the Tank..... in my mind some back pressure it good... runs and sounds great so far..... don't know what I would do if I ever do a second one.

4 hours ago, Aldon said:

I have done same by filing a large cotter key flat at the ends and using it similarly to a valve stem remover. A nail or small screwdriver through the top of the cotter key for torque.

That's why your "the Man" Aldon... didn't think you mess'd with anything smaller then a GT14?  

Edited January 17, 2017 by rgrottk