
Originally Posted by
Crowlski
Someone tell me I'm wrong. But this looks a bit wonky. Lots of bends and pipe flow. Wouldn't you want less plumbing to reduce restriction?
Here's a post from 2004 by Bisimoto, on why his headers have the bends they do.
"Greetings all,
I was notified of this post, and quite suprised at some of the comments generated.
The rationale for the bends on my designed header is a follows:
I noticed a given area beneath our vehicles that can assist with the scavaging effects of the header. This was realized with manometer/ pressure differential tests done on my crx, and 2 other civics.
I was pressed to design a unit that could terminate at this area for obvious reasons. I also had the additional challange of an ideal length of header piping to allow optimum exhaust pulse tuning, which was dependant on RPM range, displacement, etc.
My experimentation with fluid dynamic concepts of "flow in pipes" proves that you can achieve the same flowrate and fluid friction in a given stright pipe in one of specified bends if sized properly. In simple terms, a smaller stright pipe flows the same (and experiences the same friction losses) as a calculated "bent" one of larger diameter. There is plenty of scientific documentation on this subject as well.
Hence, this concept is one I use on my own race car to generate ideal HP and torque numbers, with a very simplistic setup: simple carbs, a SOHC, and ignition!
As for the F1 analogy, yes, clearance/aero package may be the reason, but I had compartment constraints as well. In regard to underhood temperatures, I always suggest ceramic coatings...just like on my vehicle.
I am not a businessman trying to sell headers. I am an engineer, scientist, and racer who desires to bring great technology to the masses...at a decent price."
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