X H or No Pipe

[Nick Campagna]

If one has a V8 motor, 180 degree exhaust system, and a 180 degree intake system, do you really need a crossover pipe or is it just a crutch for non-180 exhausts on V8 motors ? Assuming that you have a standard 90 degree crankshaft.

[Mwilson]

I went with X because it looks cool, doubt that helps though!

[1989GTA]

Here is my opinion just based on research only. They can only help or do nothing. I have not seen any reports where someone lost power.

[Lasse]

Originally Posted by Nick Campagna

If one has a V8 motor, 180 degree exhaust system, and a 180 degree intake system, do you really need a crossover pipe or is it just a crutch for non-180 exhausts on V8 motors ? Assuming that you have a standard 90 degree crankshaft.

I will suggest X-pipe, because it is high flow version of H-pipe. I don't know if there is much difference, if you have 180 degree exhaust or flat plane crank, but I assume it won't hurt anything and helps also in those cases.

[rookie]

Originally Posted by Nick Campagna

If one has a V8 motor, 180 degree exhaust system, and a 180 degree intake system, do you really need a crossover pipe or is it just a crutch for non-180 exhausts on V8 motors ? Assuming that you have a standard 90 degree crankshaft.

My understanding is the X pipe was designed to get the effects of a 180 degree system (IE: merge and cancel out exh. pulses) in classes that did not allow 180* systems.

So I don't think you would need any type of cross over or X, as this is what a 180 system does.
180 Cross Over Headers - Schoenfeld Headers

[Lasse]

Originally Posted by Nick Campagna

If one has a V8 motor, 180 degree exhaust system, and a 180 degree intake system, do you really need a crossover pipe or is it just a crutch for non-180 exhausts on V8 motors ? Assuming that you have a standard 90 degree crankshaft.

What kind of car is this? Is it race or street car? Does it have mufflers and if so, how restrictive are they?

[Packard V8]

FWIW, H-pipes were developed because they were less expensive and lasted longer than resonators. Back in the '50s it became obvious V8s with separated dual exhausts developed a resonance at cruising RPMs. GM started adding resonator-eliminator/mufflers behind the axle. Because these ran so cold, they rusted out quickly. Ford developed the H-pipe to eliminate resonance. It cost less and didn't rust out. The X-pipe was developed first for NASCAR about ten years ago. It seemed to make more power with the extremely long duration cams they run on the speedway.

There are those here and on other fora who swear the X-pipe to have made large HP gains measured on the chassis dyno. Guess I just haven't had the right setup on enough cars, but I haven't seen the big numbers.

thnx, jack vines