White powder from exhaust silencer-GONE!

Bob,

Glad you solved the problem. Who did the welding? I hate to say it, but, they were not very talented welders.

I had mine done as well. It cost quite a bit more, but, the results, in my opinion,
were better. Did you have any trouble getting the muffler off? I found the nuts securing the muffler were pretty tight. I think they are brass.

 

Bob,

When I took my muffler to the shop, they took one look at it and didn't want to weld it.

They did however recommend a fabricator to do the welding and of course, he was way more expensive.

I had the white dust as well. It drove me crazy trying to keep the engine clean.

Like you, this was the best solution.


John

 

Hello, do you have more details on the way you had it done by a "fabricator"?

What is a fabricator? Did you ship the silencer away to them or did they do the work immediately while you waited?

Any photos of before and after?

Exactly what joints should be welded?

What weld process / material should be used to get the best long term results on this $8k part? New replacements are quite expensive so I want to make sure I'm doing it right.

Did you replace the silencer metal gaskets with new? I think they are one time use.

Thanks!

 

Just as Bob mentioned. It's fairly easy to remove the muffler. You can see the joints that are only pressed in and leak. I did not replace the gaskets. I did replaced the nuts to secure the muffler back on. They were pretty expensive for what they were.

Some muffler shops may be able to handle the welding. Just make sure they feel confident to do the job. If not, I'm sure they will recommend someone more qualified and more expensive. You get what you pay for. Good luck

 

Thanks guys. This sounds like a great fix to complete at the same time as installation of Capristo brackets. I'll find someone who is confident with welding an expensive stainless steel part. I'm still not sure if my silencer is leaking or not, but it seems like I am continuing to get some new white dust even after resolving my "detail shop residual white polish" issue. And there are some audible resonance issues that I would really like to correct. Maybe making the silencer joints rock solid, plus the capristo brackets, will help clear up some of them.

I badly want to hear that beautiful engine rev from low to high RPM smoothly with nothing vibrating!

 

Just as a long term follow up - if anyone here has had this welding work done - to stop the white powder in the engine bay - have those welds stayed intact?

Any cracking or broken welds? How many mines have been driven on newly welded areas?

Now I just have to find out where and what that white dust is !

Thanks


Sent from my iPhone using Tapatalk

 

It seems a waste of time to me as the dust will still get out eventually.
It’s the insulation between the silencer body and the outer stainless steel skin.
The 360 is far worse and I’ve rebuilt a spare one I had with a ceramic ‘super wool’ for less than £100. There is no dust to come out now.
It just needs a TIG welder the tack the covers back in place and when finished you cannot tell it’s been apart.

Image Unavailable, Please Login

Image Unavailable, Please Login

Image Unavailable, Please Login

Image Unavailable, Please Login

Image Unavailable, Please Login

Image Unavailable, Please Login

Image Unavailable, Please Login

 

Hey Mike thanks for your reply and the Excellent photos - that is seriouly cool! Very well done and you can see the process you went through. Brilliant. I might have to contact someone who knows about these things and get them to do something similar. Ill do a bit more research - heres a pic showing the issue. Both 430 exhausts. On the right is a friends cars exhaust. On the left is my 430 exhaust, showing the fine white powder.


Image Unavailable, Please Login

 

The white powder is microporous insulation. A couple different companies make it for aerospace applications like Zircar and Promat, and some have adopted it for more broad thermal barrier applications.

Because of it’s density, it is one of the best performing insulating materials available.

If it’s dusting, I’d also suggest welding it up to avoid hot spots and eventual failure/rupture.




Sent from my iPhone using FerrariChat

 

Could you tell me - Ive seen a couple of youtube videos about welding the exhaust to muffler join, to prevent the white material spraying out. Id be fine with doing that, but - isnt part of the original design of not welding that gap, so that the exhaust has room to expand when its hot? It seems the 430 exhaust cracks are infamous. Ive seen people who have welded and its stoped the white material coming out, but I wory that will cause damage to another part of the 430 exhaust system?

Any knowledge anyone?

Thanks

 

I don’t have first hand experience, but yes I believe the original design was meant to take up some thermal expansion and welding the tubes may shift the expansion to somewhere else that may fail.




Sent from my iPhone using FerrariChat

 

curious on the OEM insulation - was this put in place to keep under engine hood temps down?

What would be the consequences of running the muffler with no insulation?

Would the ex note change?

 

The insulation would keep temps down. I would also think it effects sound to some degree as it would dampen the pipes going through it.


Sent from my iPhone using FerrariChat

 

Yes and yes..... since I reinsulated mine it’s a lot cooler and the exhaust isn’t as boomy. It also stays shiny rather than discolours.

 

Did you notice any weight differences?

 

Not interested in weight. The OEM silencer is a bit of a boat anchor so anything from the insulation is minimal and the original material will be similar to what I replaced it with.
I did it purely to get rid of the dust and lower heat soak is a bonus


Sent from my iPhone using Tapatalk