H pipe or X pipe and why?
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H pipe or X pipe and why? I notice more people are going with a X pipe on their true duals than a H pipe. Is there a reason performance, clearance, or sound wise or is the X pipe just for looks??
Originally Posted by black_z
Scavenging
numbz from ls1.com, forgot his s/n here has an H-pipe setup. he makes x-pipe setups as well but i dont think he put it on his car though to test a difference.
eitherway i'll take an x/h over a y anyday
, except tally has a nice y dumped setup. Trending Topics
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This article pretty much settled the debate over X vs H pipes for me.
http://www.vetteweb.com/tech/0307vet_xpipe/
X pipe made more hp and was actually quieter on a C5 both inside and outside the car.
http://www.vetteweb.com/tech/0307vet_xpipe/
X pipe made more hp and was actually quieter on a C5 both inside and outside the car.
The H pipe stops working after a certain rpm. I have read several articles where they compare an X and a H pipe. The X always made at least 10 more Hp and Tq. Picture exhaust flowing down the pipe. The H has a sharp 90 degree angle. Exhaust will take the path of less resistence and after a certain speed making that sharp of a bend will affect flow so much that it continues straight down the pipe. The X has a mandrel bent curve that splits nicely. The flow from the left can pick a path without having to affect the speed of the exhaust.
On The Tree
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Originally Posted by jrp
:yup:
numbz from ls1.com, forgot his s/n here has an H-pipe setup. he makes x-pipe setups as well but i dont think he put it on his car though to test a difference.
eitherway i'll take an x/h over a y anyday, except tally has a nice y dumped setup.
numbz from ls1.com, forgot his s/n here has an H-pipe setup. he makes x-pipe setups as well but i dont think he put it on his car though to test a difference.
eitherway i'll take an x/h over a y anyday
, except tally has a nice y dumped setup.
duals
Originally Posted by JHarmon
Thats me. I am a firm believer in the H pipe. I build X pipes too because that's what people want. I have no scientific data to back up my opinion though. GM uses a H pipe on the Vette. Ford uses a H pipe on Mustangs. Plenty of aftermarket dual systems use an H. I trust their engineers over a bunch of shadetree mechanics like us. I'll bet on a dyno test there would be no more than 1-2 hp difference. You can get variations like that from back to back runs without changing a damn thing. One thing I know for sure is that the H pipe sounds better. duals
duals On The Tree
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Originally Posted by FAST LS1
In this link http://www.vetteweb.com/tech/0307vet_xpipe/ they show the x makes more hp and trq. I'm sure Magnaflow would rather build an H pipe if it were better than an X since an H is probably cheaper to build. They went with an X though because it produces more hp from the scavanging effect.
Originally Posted by JHarmon
That isn't really a valid test because the X vs. H wasn't the only thing changed. It doesn't really show that much power gain either. A siamese X takes very little time to make; two 45* bends with holes at the bends welded together. An H needs to be notched on both ends to mate up with the other two pipes and requires two welds. A H pipe setup also uses less bends which IMO produces a more free flowing exhaust. As far as scavenging, the H evens out the exhaust pulses just like an X. It's not like the exhaust makes a 90* turn to achieve this with an H. The scavenging affect is achieved by evening out the exhaust pulses...which works with either setup.
In every instance we've seen, the X made more power throughout the power-band. The H is better than nothing and works very well on some combo's - but for the most power, the X is the only way to go.
An X(we only use Dr. Gas X's) is also quieter and has a more refined sound, unless put in front of a 'chambered' muffler.
An X(we only use Dr. Gas X's) is also quieter and has a more refined sound, unless put in front of a 'chambered' muffler.
On The Tree
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Originally Posted by Lane
In every instance we've seen, the X made more power throughout the power-band. The H is better than nothing and works very well on some combo's - but for the most power, the X is the only way to go.
An X(we only use Dr. Gas X's) is also quieter and has a more refined sound, unless put in front of a 'chambered' muffler.
An X(we only use Dr. Gas X's) is also quieter and has a more refined sound, unless put in front of a 'chambered' muffler.
I have had both but not with the same engine combos.
I did a fair amount of research for articles, and what I basically found is that H is good, but the X is a bit better for scavenging and would make more torque, not just peak per se but have stronger torque throughout the curve.
X has a more tuned sound, but they both sound good.
I did a fair amount of research for articles, and what I basically found is that H is good, but the X is a bit better for scavenging and would make more torque, not just peak per se but have stronger torque throughout the curve.
X has a more tuned sound, but they both sound good.
Originally Posted by JHarmon
That isn't really a valid test because the X vs. H wasn't the only thing changed. It doesn't really show that much power gain either. A siamese X takes very little time to make; two 45* bends with holes at the bends welded together. An H needs to be notched on both ends to mate up with the other two pipes and requires two welds. A H pipe setup also uses less bends which IMO produces a more free flowing exhaust. As far as scavenging, the H evens out the exhaust pulses just like an X. It's not like the exhaust makes a 90* turn to achieve this with an H. The scavenging affect is achieved by evening out the exhaust pulses...which works with either setup.
This has also been my understanding. X and H pipes are made to equalize back pressure/scavenging effect so wouldn't the X pipes design wether it be welded pieces or stamped, cause more turbulance than, like JHarmon stated, a more freely flowing H pipe?
On The Tree
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Originally Posted by Pro Stock John
I have had both but not with the same engine combos.
I did a fair amount of research for articles, and what I basically found is that H is good, but the X is a bit better for scavenging and would make more torque, not just peak per se but have stronger torque throughout the curve.
X has a more tuned sound, but they both sound good.
I did a fair amount of research for articles, and what I basically found is that H is good, but the X is a bit better for scavenging and would make more torque, not just peak per se but have stronger torque throughout the curve.
X has a more tuned sound, but they both sound good.
myORH
Originally Posted by silent1
This has also been my understanding. X and H pipes are made to equalize back pressure/scavenging effect so wouldn't the X pipes design wether it be welded pieces or stamped, cause more turbulance than, like JHarmon stated, a more freely flowing H pipe?
Here's a link on exhaust theory
http://www.accesscom.com/~knliao/exh_theory.html
It's much like a merge collector makes more hp/trq than a regular collector.
http://www.carcraft.com/techarticles/0304_merg/
This is some more technical info on an H vs an X setup.
http://www.timskelton.com/valkyrie/t...es/h_pipes.pdf
Last edited by FAST LS1; Jan 29, 2004 at 05:06 PM.