Wrapping your exhaust system

[JGK]

JSimpson,



Your explanation makes sense. On the other hand, as the exhaust charge cools, it condenses and takes up less space. That, to me, would compensate somewhat and make it easier to flow out. Plus, the momentum of the charge going down the pipe and the condensing of the charge might tend to create a lower pressure area that would help suck the hot gases just coming out of the turbo to follow on down the pipe.



It seems to me that this sort of reasoning is used to describe why exhaust systems on 2 stroke motors are built the way they are. You being familiar with bike exhausts would know more about that then me (I just like going fast on them!).



I dunno. I'm not schooled in fluid mechanics and thermodynamics. But this seems like a good subject for a round or two of beers!



In any case, I wrapped my down tube to the first junction on my 4" when I put it in. I'm thinking of adding a layer and runnning it all the way to the muffler, just for grins.



Jay

 

[Mr. Brewski]

I had Therm-Tec wrap on the headers that were on a small block cheby in an S10. It's a good product. After I wrapped them, I never got another header burn. Blankets are probably the way to go, but I dont understand how they could rust cast iron when the manifold spends a good part of its time at 700 degrees plus. Seems to me that the heat would keep the wrap pretty dry.

 

[rgamble]

I did my engine with the ATP wrap. I am very happy with it. It really helps with the in cab noise. Takes a little longer to cool down. I would do it again.

 

[Diesel Freak]

HMMMMmmmmm



here is the deal with hot gases..... the colisions between gas molecules become more elastic (lower ammount of absorbed energy... the molecules are more active and they bounce off each other and their surroundings more freely) as the temperature is increased.



Basicly this means it takes less energy to move a hot gas than a cold one.



JGK:

as a gas cools it becomes more dense... . the only gas that has a possibility to condense (change phase) in an exhaust system is steam. Once the engine is up to N. O. T. this is not all that likely to happen.



I am still kicking around the idea of wrapping the turbine outlet and the first few feet of exhaust pipe.