Favorite Exhaust Wrap

[luvrbus]

Don't wrap the bellows (expansion) on the pipe or it will break a section of the manifold on a series 60 I have seen it break the manifold on 8v92's too with the heat bellows wrapped

[Jim Eh.]

I think I would ceramic coat the pipes instead. We've been doing that with headers for years now and it makes a difference of several hundred degrees at the surface of the pipe, as a practical sense the difference between being instantly scorched on contact with a 2nd or 3rd degree burn and being able to get away with touching the pipes with no harm done. Cerakote makes a bunch of products and they are way better than they used to be both for application and for use. You still have to sand blast the parts first but now you can spray on a water based coating that will self cure at room temperature in 24 hours to a smooth glossy finish that is noticeably durable. You guys should try it. I think you can buy about a pint for about $40 and that should be plenty.

Jim

I think I may go this route but I would apply the ceramic coating on the inside of the system so blast cleaning and application would be a little more difficult.

The problem with blankets is that condensation forms inside the insulation on the surface of the pipe. It does tend to accelerate rot and the heat in the pipe is that much greater which destroys any aluminized coating that it may have had at birth. The aluminized coating is good to approximately 800 F whereas galvanized coating is only good to about 600 F
Even then ferritic type of stainless (400 series) will suffer with a blanket but to a lesser degree.

[luvrbus]

Being a rear diesel pusher I use blankets for safety mainly because of the flash point on engine,transmission fluid which is some where around 450F +/- then diesel with 125F+/- then the antifreeze and lot of engine fires are antifreeze related with a flash point of 232F +/-  but I do use the ceramic coating on manifolds some time it does help a little .I have saw a couple hundred degree drop on a diesel engine manifold before using it best I saw on a 8v92 ta was 700F EGT to around 680F     

[Jim Blackwood]

With those wraps rust is always a problem unless you live where salt is never used on the roads and  the temperature rarely drops below the dew point. I've seen exhaust pipes  turned to crumbly rust after just one year. With the thicker pipes on a bus it'll take a little longer but I've come to really hate that type of rust personally and will do everything I can to avoid it. Which means, no wraps. The ceramic works extremely well, even if just on the outside of the pipe. It keeps the heat in and that keeps the inside of the pipe drier. Since that became a thing I've rarely seen rusted out ceramic coated pipes. Now if I felt more heat barriers were needed I'd probably build a box around it using a layer of thin stainless, then maybe some thermal blanket if I could be sure of sealing up the edges, followed by another thin stainless layer. That makes an excellent barrier which is both effective and durable.

Jim

[dtcerrato]

How about wrapping ceramic coated pipes? Just wondering...

[Jim Blackwood]

Depends on how good your ceramic is. My first go around, the ceramic was attacked by road salt. Sure didn't see that one coming. But that also was 30 years ago and since then they have gotten much better.

Jim