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Im redoing my exhaust on my 75 Corvette with a th400 and SBC 355. Im looking at installing a x or an h pipe. Which one to go with? Im looking at this one from summit.
H Pipe
Summit SUM-642025: Summit Balance Tube Kits - summitracing.com
X pipe
Summit SUM-642125: Summit Universal X-Pipe Kits - summitracing.com
Thanks in advance.
Would probably be the one that fits best
^^^ yes, what BTD says...
I've heard the x-pipe is more effective but often more difficult to fit.
-Chris
Here is my understanding. An H pipe helps balance out the exhaust pressures between two pipes in a dual exhaust sytem. An X pipe actually creates some scavenging effect that helps clean out the cylinders more effectively. As Skids mentioned, I have also heard that the X pipe can take up a little more room and be harder in some instances to fit under a car.
Bottom line, the X pipe should theoretically give a little more hp. My Kid ran one on his 03 Mach I and said he could really feel the difference over stock.
Don
i like uncorked headers:D
Over at the Chevelle and at the Mustang site, a few tested the differance in them (not dyno'd), and decided that you can't tell the differance in them, in perfomance or sound. What one does to one car, wasn't the same on another car.
Like BigTruckDriver said, it would be the one that fits best.
Pat
Quote:
Originally Posted by Itoldyouso
Don is correct. An X-pipe is superior to an H-pipe, but an H-pipe is a whole lot better than not having one.
huntsville ehh !! we probably have seen each other at some events if you make any ... hooters show - dairyqueen cruises - drake tech show - whitesburg church show - south parkway muffler shop cruise in .. and others i cant think of .. be looking for my little red pinto ;)
On a 535HP engine I've done dyno tests with H, X and no balance tubes with mufflers.
An X will show about 3 HP and 12 Ft Lbs of torque over nothing and an H shows about the same HP but only about 4-5 Ft Lbs.
Tone (noise level) definitely changes but I doubt that 2 people in the entire universe will agree on any one sound being the absolute best.
If you have room run the X, if not run the H..you probably won't feel the difference, although you may convince yourself that you do.
On a side note I also tested Dyne Max Super Turbo mufflers against Flowmasters and the Super Turbos made slightly more power, but on the track the car ran an identical 3 run average with both sets of mufflers..go figgur:D
IMO the most important thing on a street driven car is to make sure the exhaust exits out the back and not UNDER the car. This will eliminate the resonance (rumble) and will make a big improvement in the sound.
My 32 roadster has a 350/350 with a 2 1/2" X-Pipe system and Magnaflows with tail pipes exiting the rear. Sound is much better than when it exited under the rear axle.
I made mine by just using two 90 degree bends and siamesed in the middle.
If you plan on ever "taking it apart" adding some V-Band clamps is a nice addition.
This is a TCI Model A chassis. The power brakes. the C4 trans, mufflers, drive shaft and set back SBFord engine are all looking for space, particularly when you are trying to keep the 2.250" piped exhaust out of sight. The H pipe works better in this case. One or the other - are needed
IC2, Thanks for the picture. The interesting thing to me is the use of rods welded on to the top of themufflers for the mount. I know you put extra effort into the U-shaped curve in the crossover but now I see how you attached the mufflers. I have a similar rectangular cross section (1"x3") for frame strength after I had to notch the main crossmember for my master cylinder and I attached the drive shaft U to it, but now I know that I can also use it for the mufflers if I can get some sort of bracket welded to the top of the mufflers. As a side question, I have always like the sound of the stock Mustang mufflers (late models) so I wonder how they would sound on a SBC 350? I anticipate problems with the wife if I use turbo mufflers or glass packs. What about the rumor that turbo mufflers are noisy at idle but swoosh at speed, I think Matt said that but I have not "heard" them. I am interested in the prospect that an H-pipe will quiet the tone a bit while helping HP a bit. Anyoddy ever tried stock Ford Mustang mufflers on a SBC 350?
Don Shillady
Retired Scientist/teen rodder
Don,Quote:
Originally Posted by Don Shillady
Assembling those big mufflers and an H pipe and all the assorted claptrap under an 'A' was a bit labor intensive, but hopefully will be a dividend in reasonable sound level and performance
Those mufflers on mine are Flowmaster 50 Delta 3 chamber series and are being used for just the same reason you are suggesting Mustang mufflers. Mustang mufflers to me sound anaemic (even as a former several time Mustang owner:) )
Flowmaster, Inc.
1Bad75Vette, Thanks for the research. Although the Summit catalog I have does not list that H-pipe kit, it is still available at that price and I ordered it. That saves me fabricating the H-branches, although IC2 did a beautiful job of fabricating his own!
Don Shillady
Retired Scientist/teen rodder
Don,Quote:
Originally Posted by Don Shillady
Don't destroy the Summit box these pieces come in - this is kind of a (very?) clunky setup that I too bought then swap "meeted" it
Holy Cow IC2, are there no bargains in the world? Actually I did get a bargain building my new computer setup when I got three small PC cases which included 480 watt power supplies in each for $9.99 plus shipping (each)! So far the power supplies are OK! I was/am hoping I can set up the H-pipe without welding, just using clamps? What was wrong with yours? I do see that I will have to expand one end of the inlet to match my 2 1/2" collector. Even at the worst case should I not be able to mock it up with clamps, mark it or tack it and then remove for a full weld?
Don Shillady
Retired Scientist/teen rodder
I was able to run an "H" pipe straight across because my pipes were fairly low. A channeled body will do that.
I hung the exhaust, then marked and used a holesaw to cut a hole where the "H" would attach to the headpipes. Then I measured the angle of the headpipes and used the TUBEMITER program to make the pattern for the fishmouth on the cross pipes. Cut the cross pipes to length, tacked them on, put a flange in the middle, then tacked the flanges. Then I unbolted the flange, dropped the pipes and welded it all up.
My pipes are welded solid from the header flange to the outlet. However, if I unbolt the "H" pipe flange and the header flange, they slide back and drop down.
The Summit kit will work if you go straight across using either the straight piece or the bent piece. The pipes that I was supplied had been poorly expanded - way too much, and the clamps supplied were not the heavy duty 3/8 so sealing was suspect. There is little room for adjustment on the suppled pieces as I found that the bent piece would not fit up to mine correctly, clearing my driveshaft as my exhaust system is quite high and out of sight. This, even with cutting and trimming which is why I ended up building the assembly shown on my Post 12 of this thread. While I chose to clamp mine in place, I could have welded it in place.Quote:
Originally Posted by Don Shillady