H-pipe vs No H-pipe
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
H-pipe vs No H-pipe
I have read several posts about the "benefits" of having an H-pipe.
Most of us with 75-82 vettes have converted their exhaust to true dual exhasts. Here is my point of debate. If an H-pipe makes a car sound better, flow better (as I have read in previous posts since I have been a forum member) The 68-74 dual exhaust vettes came from the factory without an H-pipe, so what is the "great" benefit of an H-pipe?
Most of us with 75-82 vettes have converted their exhaust to true dual exhasts. Here is my point of debate. If an H-pipe makes a car sound better, flow better (as I have read in previous posts since I have been a forum member) The 68-74 dual exhaust vettes came from the factory without an H-pipe, so what is the "great" benefit of an H-pipe?
Instructor
Joined: May 2006
Posts: 223
Likes: 1
From: Kennesaw GA
From what I understand, the H or even an X pipe will help equalize pulses in the exhaust stream. This will increase scavenging and produce a nicer tone. Lots of folks swear by them, I've never seen a dyno comparison, but I'm sure there's one somewhere.
Burning Brakes
Joined: Nov 2004
Posts: 1,193
Likes: 176
From: Hillsborough NC
632C2 did an excellent job of describing the benefit and provided Dyno results with his engine.
Here's the X-Pipe thread
http://forums.corvetteforum.com/show...ghlight=x-pipe
Do a search for his other posts, they are really great and backed up with proof.
Here's the X-Pipe thread
http://forums.corvetteforum.com/show...ghlight=x-pipe
Do a search for his other posts, they are really great and backed up with proof.
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
Originally Posted by Philvet
If you have read the posts on the benefits of a H pipe there is no sense in going over them again.
68 technology is 38 years old.
68 technology is 38 years old.
Last edited by Oldguard 7; Jun 6, 2006 at 04:45 PM.
Instructor
Joined: Jan 2003
Posts: 237
Likes: 0
From: TAMPA FL
I put an H-pipe in mine. I put flowmaster 50s w/2 1/2 duals. It was to loud for me and had a drone at 2000-2400 rpm that would hurt your teeth.
The H-Pipe made it quiter plus took 75% of the drone out. What drone was left came in at 1500 rpm and was gone at 1600 rpm. I love my H-pipe. If I got 3-4 HP out of it I consider it a bonus.
The H-Pipe made it quiter plus took 75% of the drone out. What drone was left came in at 1500 rpm and was gone at 1600 rpm. I love my H-pipe. If I got 3-4 HP out of it I consider it a bonus.
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Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
On a conventional car with chassis headers and room underneath, the perl of wisdom is that you want an equalizer tube located 18 inches behind the header collectors.
Old OLD exhaust tuning trick.
But on a C3 that's not possible so we use H pipes further downstream, in the middle of the body. Exhaust equalization has been around for decades.
I remember when I was a kid, pulling the exhaust off my '57 Bel Air so I could put headers on it. The OEM pipes had a crossover wrapping under the engine.
Old OLD exhaust tuning trick.
But on a C3 that's not possible so we use H pipes further downstream, in the middle of the body. Exhaust equalization has been around for decades.
I remember when I was a kid, pulling the exhaust off my '57 Bel Air so I could put headers on it. The OEM pipes had a crossover wrapping under the engine.
Drifting
Joined: May 2005
Posts: 1,629
Likes: 4
From: Somers CT
Originally Posted by 73383
I put an H-pipe in mine. I put flowmaster 50s w/2 1/2 duals. It was to loud for me and had a drone at 2000-2400 rpm that would hurt your teeth.
The H-Pipe made it quiter plus took 75% of the drone out. What drone was left came in at 1500 rpm and was gone at 1600 rpm. I love my H-pipe. If I got 3-4 HP out of it I consider it a bonus.
The H-Pipe made it quiter plus took 75% of the drone out. What drone was left came in at 1500 rpm and was gone at 1600 rpm. I love my H-pipe. If I got 3-4 HP out of it I consider it a bonus.
I had the exhaust shop put an "X" in mine but it was a really poor fit, I didn't like the way the pipes had to be routed with the quick bends to get into the "X" and had him remove it and re-do the system with an "H". It came out much, much better.
Le Mans Master
Joined: Mar 2004
Posts: 7,502
Likes: 1,509
From: Little Rock AR
Originally Posted by theandies
Didn't some of the early Chevy V8's have a crossover built into the intake manifold or was that passage only added when EGR valves came into play?
The EFE system uses a passage under the intake manifold for fast warm ups. The heat riser is part of that system. If you block the heat riser passage on an otherwise stock setup you WILL hear a difference in the exhaust tone. The heat riser passage is similar to an "H" or "X" pipe in that respect. It gets a little "rhaspy".
-Mark.
