Home 
Home Search search Menu menu Not logged in - Login | Register
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Stainless steel exhaust front box removal

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
Stainless steel exhaust front box removal  Rating:  Rating
AuthorPost
 Posted: 08-15-2014 10:05 am
  PM Quote Reply
1st Post
roland11a
Member
 

Joined: 12-11-2012
Location: Stone. Staffordshire, United Kingdom
Posts: 80
Status: 
Offline
Hi, at present I'm looking to refit the stainless steel exhaust system to my JH. Unfortunately the front box after the manifold is damaged due to it grounding out on the road. Therefore I'm considering removing the front box completely and replacing it with a straight pipe. This will give the car a couple of inches increased ground clearance in the middle of the car, as we need all the ground clearance we can get over here in the UK due to the terrible state of our roads and the over use of traffic calming measures such as speed bumps.


Removing the front box can be done easily by a specialist exhaust specialists for just a few pounds, however I was wondering what effect  removing it would have on the characteristics of the whole system. I know there is more to the design of an exhaust system than meets the eye and getting it wrong can greatly effect the performance of the engine.


Any thoughts would be greatly appreciated.

Thanks Roland

Thanks Roland




Back To Top PM Quote Reply  

 Posted: 08-15-2014 10:18 am
  PM Quote Reply
2nd Post
subwoofer
Member
 

Joined: 04-01-2008
Location: Sandefjord, Norway
Posts: 583
Status: 
Offline
On Ms Jensen there is a smallish resonator around where I would have expected a front muffler to be. As I understand it, in terms of exhaust manifold tuning you need an open volume in that spot since it effectively terminates the tuned transmission line from the head through to the rest of the exhaust system. With the resonator the only requirement for the rest of the exhaust from there and rearwards is to be low back pressure - without it the exhaust pipe all the way back to the back box becomes part of the manifold tuning system and may impact performance.

Caveat Emptor: I am no expert on exhaust systems, but knowing a little bit about transmission lines for RF the above explanation makes sense.

--
Joachim

Back To Top PM Quote Reply

 Posted: 08-15-2014 03:08 pm
  PM Quote Reply
3rd Post
Jensen Healey
Super Moderator


Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 976
Status: 
Offline
I just read an article on the subject:

http://www.popularhotrodding.com/enginemasters/articles/hardcore/0505em_exh/

The collector after the 4 into one connection is critical to maximizing performance. A resonator can be part of the collector, or, as Joachim stated, a termination box to isolate the tuned length of the collector.

Enjoy the article!

Kurt

Back To Top PM Quote Reply  

 Posted: 08-16-2014 11:29 pm
  PM Quote Reply
4th Post
roland11a
Member
 

Joined: 12-11-2012
Location: Stone. Staffordshire, United Kingdom
Posts: 80
Status: 
Offline
Hi All
Thanks for the reply's. it seems that I'm destined to keep the first box after all.

A good friend in the uk sent me this article to read, so if anyone is following this thread, have a read
http://sideways-technologies.co.uk/forums/index.php/topic/1395-exhaust-tuning-theory-and-system-design/

I must admit I've learned a lot in the past couple of days!!

Back To Top PM Quote Reply

Current time is 04:58 pm  
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Stainless steel exhaust front box removal Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems