Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

exhaust loss without mandrel bends

Thread Tools
 
Search this Thread
 
Old Sep 17, 2007 | 09:33 AM
  #1  
mterveen's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (2)
 
Joined: Jun 2007
Posts: 363
Likes: 0
From: Spearfish SD
Default exhaust loss without mandrel bends

want to look at getting a 3 inch true dual over axle setup from local exhaust pro shop. how much is lost in efficiency using a regular bending machine versus mandrels? e.g. the 3 inch is "squished" to 2.75 inch on a bend? trying to compare efficiency vs cost. maybe look at a combination of using regular bends for less than 45 degrees and mandrel bends greater than 45?

Last edited by mterveen; Sep 17, 2007 at 11:16 PM. Reason: axel to axle :-)
Reply
Old Sep 17, 2007 | 07:05 PM
  #2  
9t8z28's Avatar
11 Second Club
15 Year Member
iTrader: (19)
 
Joined: Jan 2007
Posts: 1,349
Likes: 3
From: Doylestown, Pa
Default

We tested 2 systems with the same muffler, pipes ran in the same locations, but one was compression bend and the other was mandrel bent. We gained 15 horsepower
Reply
Old Sep 17, 2007 | 07:08 PM
  #3  
NHRAMAN's Avatar
TECH Senior Member
iTrader: (1)
 
Joined: Apr 2005
Posts: 8,807
Likes: 0
From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
Exclamation

Originally Posted by mterveen
want to look at getting a 3 inch true dual over axel setup from local exhaust pro shop. how much is lost in efficiency using a regular bending machine versus mandrels? e.g. the 3 inch is "squished" to 2.75 inch on a bend? trying to compare efficiency vs cost. maybe look at a combination of using regular bends for less than 45 degrees and mandrel bends greater than 45?
..PLEASE... = AXEL = AXLE ......depends entirely on how many HP you are making...
Reply
Old Sep 17, 2007 | 07:15 PM
  #4  
Fb0dy0nly's Avatar
TECH Fanatic
iTrader: (10)
 
Joined: Aug 2006
Posts: 1,490
Likes: 2
From: Detroit ROCK City
Default

better off buying some mandrel bent exhaust piping from summit or something and then having them weld it together. You might as well just do a catback that is mandrel bent instead of running non-mandrel duals, especially if you are going FI.
Reply
Old Sep 17, 2007 | 11:19 PM
  #5  
mterveen's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (2)
 
Joined: Jun 2007
Posts: 363
Likes: 0
From: Spearfish SD
Default mandrels it is

is summit or jegs mandrel tubing the popular source or someplace else "cheaper"?
Reply
Old Sep 18, 2007 | 08:35 AM
  #6  
Fb0dy0nly's Avatar
TECH Fanatic
iTrader: (10)
 
Joined: Aug 2006
Posts: 1,490
Likes: 2
From: Detroit ROCK City
Default

your best bet is to call speedinc or another shop familar with running TD setups out the back because I know they do custom setups and they can help you get the parts you need to have one installed. They also carry universal custom kits like this http://www.ls1speed.com/cont.cfm?cid=C0000033 but it dumps at the axle.
Reply
Old Sep 18, 2007 | 06:00 PM
  #7  
9t8z28's Avatar
11 Second Club
15 Year Member
iTrader: (19)
 
Joined: Jan 2007
Posts: 1,349
Likes: 3
From: Doylestown, Pa
Default

Originally Posted by mterveen
is summit or jegs mandrel tubing the popular source or someplace else "cheaper"?
Try pypesexhaust.com
Reply




All times are GMT -5. The time now is 08:39 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE