Billowing Hot Air: A Brief Analysis of Fluid Dynamics in Exhaust Systems

[AdamVR4]

I can only assume the same general relationship would exist when you compare short, equal length manifolds (like DR's TD05 and T3/T4 headers) to long tubes like Ray's or LSE Josh's old headers:

[MR2]

They are using a log though, Logs are well known to be damn horrible, it would be nice to compare the stock 3000GT headers (not as horrible as a log, seeing as it seems to have decent collectors etc) vs something extravagant and aftermarket with the same turbo

[BigTyla]

They are using a log though, Logs are well known to be damn horrible, it would be nice to compare the stock 3000GT headers (not as horrible as a log, seeing as it seems to have decent collectors etc) vs something extravagant and aftermarket with the same turbo

That would be nice, wouldn't it? Unfortunately the support for this platform is fading fast and no one seems interested in doing these kinds of tests.

[MR2]

no fair!

[BigTyla]

I wish I had access to this article:

A Second Law Approach to Exhaust System Optimization

Abstract

A model has been constructed that applies second law analysis to a Fanno formulation of the exhaust process of a turbocharged diesel engine. The model has been used to quantify available energy destruction at the valve and in the manifold and to study the influence of various system parameters on the relative magnitude of these exhaust system losses.

It's written by an engineer at Cummins. I'd really like to get my hands on this. I might have to call in a favor at Auburn.

[MR2]

I think you should call in a favor

[BigTyla]

Here is a paper by the same author that appears to precede the previous article:

http://technovol.jsme.or.jp/esd/COMO...1/C85_P529.pdf

It's hard getting published papers now that I'm not in college, but it's not like I could legally share them anyway.

One more that could be useful:

https://springerlink3.metapress.com/...ringerlink.com

[HilbillyHomeboy]

How did I miss this thread?! Awesome write-up. Thank you, Tyler, for a superb addition to the knowledge base.

Jeremy

[BigTyla]

How did I miss this thread?! Awesome write-up. Thank you, Tyler, for a superb addition to the knowledge base.

Jeremy

Thanks, I do what I can. Maybe one day I'll be able to expand upon this with some real-life analysis.

[j2k4]

Thanks, Tyler.

My grasp on this stuff has loosened a bit over the years - nice to know a bit of common sense can get me close.