Using JB Weld to secure deflector on 390xp muffler

[Colonel 428]

Any reason why JB Weld steel won't work to secure a 20 gauge steel deflector to an OEM 390 xp muffler that I've added an extra exhaust port to? Thanks.

 

[Stevetheboatguy]

Any reason why JB Weld steel won't work to secure a 20 gauge steel deflector to an OEM 390 xp muffler that I've added an extra exhaust port to? Thanks.

If you cannot weld. Rivnuts are your friend. I wouldn't trust epoxy in a situation like that.


Steven

 

[Thumper88]

It wont hold. Been there, tried that, itll melt and make a nasty mess

 

[jacob j.]

If you cannot weld. Rivnuts are your friend. I wouldn't trust epoxy in a situation like that.


Steven

Could he just make the entire muffler out of one gigantic chunk of JB Weld?

 

[slackinoff]

Even the high temp JB weld won't stand up. It will probably work for a handful of runs and then degrade. I used it to secure an exhaust stud into a cylinder head that had stripped threads. I worked for a couple of tanks before the epoxy broke down.

 

[farminkarman]

Any reason why JB Weld steel won't work to secure a 20 gauge steel deflector to an OEM 390 xp muffler that I've added an extra exhaust port to? Thanks.

If you take care of shipping to and from me, I would be happy to weld it up for you.

 

[slackinoff]

Harbor freight has a decent hand rivet gun that will work for not much money.

 

[Stevetheboatguy]

If you take care of shipping to and from me, I would be happy to weld it up for you.

Generous offer right there.



Steven

 

[Bigmac]

Could he just make the entire muffler out of one gigantic chunk of JB Weld?

I would get it cnc cut, so you could mass produce them.

 

[Bigmac]

If you cannot weld. Rivnuts are your friend. I wouldn't trust epoxy in a situation like that.


Steven

I like the nut-rivets as well, easy to put spark screen under as well if needed

 

[farminkarman]

I like the nut-rivets as well, easy to put spark screen under as well if needed

I recently picked up a rivnut gun for doing muff mods that require a screen. For those that don't need the screen, welding/brazing is the way to go.

 

[Colonel 428]

Would soldering it hold?

 

[Stump Shot]

Would soldering it hold?

Silver solder or brass brazing will work with a mapp torch.

 

[farminkarman]

Would soldering it hold?

The short answer is no. Technically a lead based solder will stick to mild steel, but the melt temp is pretty low. The muffler temp could easily exceed the melt temp of the solder. As Steve said, brazing absolutely would work.

 

[MG2186]

The short answer is no. Technically a lead based solder will stick to mild steel, but the melt temp is pretty low. The muffler temp could easily exceed the melt temp of the solder. As Steve said, brazing absolutely would work.

I’ve been silver soldering my pipes in for years and have never had any troubles

 

[farminkarman]

I’ve been silver soldering my pipes in for years and have never had any troubles

That is a brazing process, not soldering

 

[Duce]

If you do not care how it looks, but works, 3 sheet metal screws. I just braze them on with map gas, them high temp paint to hide my mess. @farminkarman is offering a very nice alternative.

 

[Bigmac]

288 deflector with nut-rivet’s on a 390

 

[Colonel 428]

If you take care of shipping to and from me, I would be happy to weld it up for you.

Thanks for the kind and generous offer. I may take you up on it if I can't find someone locally to do it very cheap.

 

[Colonel 428]

288 deflector with nut-rivet’s on a 390View attachment 329883

Hey Bigmac. Did you cut the new exhaust hole the size of the deflector on your saw?