whats up with the big exhaust extension's

The one's I'm talking about are used on Pete 389's... maybe on some KW's as well...

http://www.truckpaper.com/images/Truck/fullsize/87703756.jpg

 

Ok..........

 

that pipe over a pipe is there because the iner pipe gets hot enough to ignite whatever touches it. thanks to dpf,s.

 

At first I started wondering about the larger stack extensions. Then it all fell into place. The DPF heat is cooking the exhaust stacks and so many trucks with DPF's from various manufacturers have the larger exhaust with slots in the bottom. There is an exhaust tube most of the way up that stack which is the same size and the lower exhaust. The larger portion really doesn't get hit with exhaust till at the end. This is all to keep the chrome on the stacks still looking good. The high heat from the DPF will destroy the chrome on regular stacks. Take a look at all the rusted and cooked pipes on DPF equipped trucks.

I was picking up a load at a shipper (can't remember the name now) back last summer, who was working on a solution to the DPF cooking stacks. I think they are the ones who originally developed the larger chrome stacks with the slots in the end. They were having fits on how to develope something that was a "normal" stack that would not discolor, rust, or look like junk when subjected to DPF heat.

One more "unintended" consequence of your government hard at work trying to make the planet safe for us in spite of what it costs.

More and more, I think I will just rebuild what I have or get a glider kit with a rebuilt pre-emissions engine next time.

 

dumb ### gonna sit there and insult large cars truckers for a factory part. That's a good one. lol

 

Having the exhaust port higher above the truck, means less emissions go onto the cars in the rear. (redirects flow)

By putting a tube over a tube (with holes) it decreases heat signature. (Military trucks do the same) and decreases radiating heat to the outside. Larger diameter of the stacks also increase the flow of how freely gasses (exhaust) can vacate the tubes.

Long story short, keeps the exhaust lines cooler, and decreases outside heat signature, and redirects exhaust fumes further away from the vehicles behind it. WA Trucking Company's are starting to make that stuff standardized.

 

What about bigger/smaller exhaust from the turbo?-let me ask you all this, those who know : what are pro's and con's of going with the one inch bigger exhaust from the turbo? I have the 2006 isx and after the Vgt there is the reducer to the smaller exhaust, vs the Vgt exhaust size. My pipe is beginning to rust through so, I was thinking about changing the pipe to the same size as the Vgt exhaust port, diameter wise. Should I do it or not? Why? Why not? Thank you.

 

Those exhaust pipes rusting out and other pieces of the equipment failing prematurely are very much "intended" consequences of EPA regulations, they help make it more economical to replace a truck than repair it once it reaches an age where it will be falling behind "current" EPA standards. This "Planned Obsolescence" helps keep the overall fleet on the same page as the newest crop of compliant trucks.

As for full 10" straight pipes running up the sides of a stretched Pete or KW, those are the trucker equivalent of the fast&furious crowd's fart can. But, to each his own.