JB Weld on exhaust?

[ScottD]

A friend helped me install a 2.5 exhaust system on my Daytona.

We had to fabricate a strap to hang the muffler. The strap was thin, I thought it would hold but it recently broke.

I want to JB weld a small corner brace on top of the muffler so I can put a bolt through it and hang the muffler from this bracket. It will be hanging from the factory rubber hanger.

The stuff is rated up to 600F so I thought it was worth a try. A friend of mine said JB weld would not hold on the muffler. Has this been anyone else's experience? I'm just trying to avoid having my friend come back out with a welder if possible.

[minimopar]

JB Weld is only as strong as the surface it is mounted to. From your description, it does not sound like it will hold. You would be better off welding something or drilling a hole in the muffer and bolting something to it.

[ScottD]

The back end of the muffler juts out a little farther than the stock hanger. On a stock system, there is a hanger welded to the back of the muffler and it hangs from the rubber hanger from this point.

On my car we used the stock rubber hanger but the strap we used had 2 ninety degree bends in it to make up for this change in muffler position.

I suppose I could JB weld a similar bracket to the back of the muffler if the top of the muffler case is too weak to support a small bracket JB welded directly to it.

At least the weather has turned back to dreary and crappy here in the east so I don't have to be bummed about being unable to drive it right now.

[Turbodave]

On most of the systems I've installed with non-factory mufflers I use a generic hanger that uses a clamp on the end that mounts around the pipe. Usually once the original rubber bracket is removed you can use on of it's bolt holes to hang the universal hanger. I would not trust JB weld to hold an exhaust bracket. If having the factory style hanger is a priority for you I would just have the bracket welded to you muffler, I would guess that your avarage muffler shop would do this for a couple bucks if you don't have access to a welder.

[ScottD]

Actually my father gave me one of those generic type clamp hangers this weekend. That might be a good alternative to try and I haven't ruled that out yet.

I thought about taking it to a local shop to have it welded up, but those places are ..... sometimes haphazard in how they do their hangers. On my C/S they tacked hangers everywhere.

When we did this job we cut off the hangers off the factory exhaust. We intended to weld the muffler hanger right onto the muffler but the problem we ran into was the FWD-P exhaust system didn't fit as well as we'd like. The hopover pipe required moving the muffler rearward. It was funny because at first we thought the muffler I bought was too long, then we placed it side by side with the stocker and were like WHAT??? the new muffler is shorter than the stocker!

I guess I'll have to figure something out, I might end up taking it somewhere though because I can't drive it as is.

[Shelby15psi]

I have used JB weld MANY times, lol. In my experience, it doesnt hold up well in conditions which are very hot. I have tried it on mufflers etc, and it always ends up cracking....anyone else? I have tried mixing it diff, but always the same result. I know someone that used it to patch their engine block, and it worked~! I dunno,


Dustin

[minimopar]

If you use one of those generic hangers with the rubber straps that has a bunch of holes, you will probably find that it lines up with the back one of the bolts for the bumper strut. I just pop it on there and add a nut to the bolt to hold it on. On the other end you just use a normal U-bolt to attach it to the tail pipe. Worked for me.

On my CSX I welded the stock hanger on the muffler. Unfortunately the Dynomax Super Turbo is much heavier than the stock muffer and the stock rubber mount will stretch. I had to add a couple of springs to it to help it out.

[ScottD]

Sounds like JB weld is out. I've never used JB weld so I was kind of looking forward to fiddling with it, lol.

I didn't think of using an alternate spot to hang the generic hanger so the bumper mount is a good idea.

Even if I can get a decent temporary fix that would be good so that I can drive it to my friend's house instead of having to bring his welder to my place.

[Turbodave]

My strap may be in the hole for the bumper mount, not sure, there are plenty of places back there to mount it from what I remember. The universal hangers come in a few designs, some are a long rubber strap that you bolt to the car and a metal ring/u-bolt that connects to the pipe. Others use a metal strap with about 1" of rubber between that and the bracket, these work best for me because they limit the movement of the system, with just the rubber strap my exhaust would rub on the springs when cornering hard, I think the soft factory mount would act the same way.

This is the style hanger I like to use.
http://www.jcwhitney.com/webapp/wcs/...&storeId=10101

[ScottD]

That's the style hanger I have sitting on my workbench.

If it EVER stops raining here, I'll poke my head under the car and do some backyard engineering.

Thanks to everyone for all the help/suggestions!

[Shelby15psi]

It is great for other applications thow~!


Dustin

[ScottD]

I used the strap Turbodave recommended.

I took out the bolt that hangs the factory hanger and bolted the universal hanger though that with a nut on the back. I used a 15mm bolt because it was longer, and I used two thick headbolt washers to move the hanger out away from the frame.

I think this set-up really improved the exhaust, it lets it move but really does keep the movement in check. Previously I think it was tapping the springs, it is a tight fit in there between the gas tank and springs. Hopefully I'll get it out for a test drive today and confirm this.

Thanks again for all the tips/advice.

[Garret]

I've used that metal weld Epoxy that's a grey putty looking stuff with a black putty stuff on the inside of the grey and it worked good on my friend's turbo laser (DSM) exhaust