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Old 02-20-2007, 04:04 PM
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zero-loss exhaust system?

I just read an article by David Vizard called "Auto Exhaust Science", it can be seen here: http://www.superchevy.com/technical/...exh/index.html

Vizard's saying that secondary length is important and to put a pressure wave termination box (resonator box) before the mufflers to set the secondary length. Does anyone know about this stuff? The article is interesting but it cuts short all of the details I need to know.

I'm planning on making my own custom headers and exhaust system for my car, here are my specs:

3000lbs car, ~350HP 383 stroker (vortec heads, comp XE262, performer rpm)
TH350 trans, 3.73:1 differential.

I was thinking of making my headers with ~34" long / 1.625" diameter primaries, and a collector that tapers down to 2.5", and run 2.5" pipes for everything else. Based on what I've read it looks like I need a secondary length of about 24" or so, then it needs to go into the magical pressure wave termination box. I don't know if this is a good idea or not but I'm thinking of making a box that both pipes go into so it does the duties of a H/X pipe at the same time, thats how his example seems to do it.

Check out the picture here of his example system:
http://www.superchevy.com/technical/.../photo_21.html

So what do you all think?

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Old 02-20-2007, 04:13 PM
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The new issue of PHR March, p.96, he makes the comment of putting a Flowmaster muffler over the collector tube, allowing the collector to stick 1/2 inch inside the can as an anti-reversion, and he made MORE power back to back on the dyno than open headers.

Of course dynos don't have X or H pipes nor tailpipes.

There have also been tests to indicate that the collector diameter should be extended about 18 inches before reducing diameter.

I have even experienced 4-2-1 Flowmaster header extensions that made a tremendous difference.

Magnaflo did a custom system that gets bigger between the headers and mufflers, then gets smaller before entering the muffler, then bigger after the muffler, and made more power than open headers...... yikes.

There was also a header test published of a 400+ hp 350 that the 1 1/2 dia headers out powered all others tested.

More fun..........

If you build it, run it on a chassis dyno, then run with open headers and see what you get.

Personally I think it is a lot of work for a few hp.

edited= flowmaster

Last edited by xntrik; 02-20-2007 at 07:08 PM.
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Old 02-20-2007, 06:27 PM
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MAC makes this for mustangs, its just a box that takes the place of the H or X, its called the prochamber, and its worth a few HP apparently. It wouldn't be too hard to copy.
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Old 02-20-2007, 08:05 PM
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The termination boxes Vizard describes probabily will be very hard to fit under your car. The added weight would just about offset most of any real gain in power.
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Old 02-20-2007, 09:23 PM
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isnt a resonator box just another type of muffler to help quite the exhaust???
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Old 02-26-2007, 10:45 PM
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Vizard didn't say the terminator box had to be a certain shape did he, just a certain minimum size, I think 10 times the volume of one cylinder? A long tubular chamber that's larger in diameter than the secondary pipe (maybe even oval pipe) might work just as well, and fit more easily under a typical car.
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