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EXHAUST "H" PIPE


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Guest RON JONES

I don,t think there are any disadvantages.My neighbor just put one on his 5.0 stang,they claim it makes hp.I do know that the X design is alot better than the H-PIPE design.In a nut shell it equalizes the exhaust to provide alot better flow.I beleave what it does is since only one cylinder fires at a time,your useing both sides of your exhaust per cylinder fire.

 

[This message has been edited by RON JONES (edited March 06, 2000).]

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The theory is that the exhaust pulse from one pipe ahead of the H- or X-pipe is split into both pipes downwind of the H or X, allowing it to have less backpressure and better sound absorption from two mufflers instead of one.

This assumes that the pulses from the engine arrive at the H or X at different times (alternating). Now if difference in the tube lengths from two ports (one on either side of the engine) is off by 1/2 of the spacing of the pulses at a particular rpm, they would arrive at the H or X at the same time and there would be no "splitting" of the exhaust. I wonder if the NASCAR guys worry about this detail.

 

As far as X-pipes, the only info I have on hand is from the Dr. Gas Web site http://www.drgas.com/products.html :

 

"SYNCHRONIZING CROSSOVER KITS: This is the latest generation, high-tech, crossover system for V8 and V6 engines. It obsoletes all other crossover designs. Dyno tests show 10-25 h.p. increase. Noise is reduced by 2 to 6 dBA. The exhaust note is modified to sound like an Indy car! The crossover is available as a complete kit or the junction may purchased separately. A complete kit will make up the first 3 to 4 feet of the exhaust system. Included are flanges, gaskets, mandrel bent inlet and outlet tubes and the crossover junction. The crossover may be installed after the headers, or after the catalytic converters(CROSSOVERS ARE NOT EMISSIONS LEGAL IF USED IN FRONT OF THE CONVERTERS). The kits can also be custom configured to special needs...call us! When selecting a size, it is suggested you match the diameter of the header collector/converter outlet with the size of the crossover. Muffler inlet size should match the outlet size of the crossover."

 

I used a 2-1/2" X-pipe (I bought the junction only, without the inlet and outlet pipes) just under the slip yoke of the trans. It's a tight fit on a 240Z. I had to use sections from the tight (4" radius) J-bend mandrel 2-1/2" pipes in both inlets of the X-pipe and one on one of the outlets, and a section of the 3-1/2" radius 2-1/2" pipe diameter tubing "donut" from The Chassis Shop on one of the outlets.

 

Again, since the beast is yet to start, I have no idea what it will sound like, or whether it's really worth while on a mufflered exhaust. I'm sure if the NASCAR guys are useing them (which most are), they are worth it for their unmuffled systems.

 

You can see my exhaust at:

http://www.tidalwave.net/~pparaska/exhaust.htm

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