User Tag List

Thanks Thanks:  0
Likes Likes:  1
Results 1 to 8 of 8

Thread: Exhaust bore size

  1. #1
    Regular Member
    Join Date
    Jan 2015
    Location
    derby
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : vectra c sri

    Trim : sri xp

    Engine : 1.9

    Year : 2007

    Default Exhaust bore size

    Hi chaps own 1.9cdti been offered twin exit exhaust but it's from a 1.8 petrol is bore size an issue. Wont be having front pipe or middle box.

  2. #2
    Regular Member northpole's Avatar
    Join Date
    Apr 2016
    Location
    Ipswich
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Vectra C

    Trim : SXI limited edition

    Engine : 2.0 16v DTI

    Year : 2003

    Mileage : 140000

    Default

    yes the 1.8 has a slightly smaller size so you'll need an adaptor to step down from your front pipe to the middle pipe... other than that it should all be a direct fit... not to sure about the adverse affects it might have on the gasflow but don't think it'll be a problem as it is to far down the exhaust line anyway..

  3. #3
    Regular Member
    Join Date
    Apr 2008
    Location
    West Yorkshire
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Any decrease in bore size will cause a showdown of the overall laminar flow and exhaust scavenging etc.

  4. #4
    Regular Member northpole's Avatar
    Join Date
    Apr 2016
    Location
    Ipswich
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Vectra C

    Trim : SXI limited edition

    Engine : 2.0 16v DTI

    Year : 2003

    Mileage : 140000

    Default

    Think you forgot some of the aspects of a dual exhaust VS single exhaust

    the gasses will flow out regardless of the tiny reduction.. as the narrow bit is to far down the line... also he'll endup with double the amount of exit points plus double the size of pipes... it would be different if he already had a dual exit exhaust and would than go to a smaller diameter... overall he's actually extending the exhaust diameter by as much as 1.4 times (and i'm confident it's more) and actually reduces the resistance (from the smaller diameter) by adding the extra back box...

    so no it shouldn't be a problem like i said before...

  5. #5
    Full Member Darklord's Avatar
    Join Date
    Apr 2018
    Location
    Northeast
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Vauxhall Vectra

    Trim : LS/Life

    Engine : 1.8

    Year : 2004

    Default

    Just make sure it's not made by Klarus!

    My new exhaust clearly has little internal baffling compared to the original, and the rear box blares, guffaws and belches rudely at times, in fact it reminds me of an old Morris Minor, with its belching exhaust note upon gear changes.

    The system is accurately made and fitted well. But it sounds incongruous at times.

    Well I suppose it was cheap...

  6. #6
    Regular Member
    Join Date
    Apr 2008
    Location
    West Yorkshire
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by northpole View Post
    Think you forgot some of the aspects of a dual exhaust VS single exhaust

    the gasses will flow out regardless of the tiny reduction.. as the narrow bit is to far down the line... also he'll endup with double the amount of exit points plus double the size of pipes... it would be different if he already had a dual exit exhaust and would than go to a smaller diameter... overall he's actually extending the exhaust diameter by as much as 1.4 times (and i'm confident it's more) and actually reduces the resistance (from the smaller diameter) by adding the extra back box...

    so no it shouldn't be a problem like i said before...
    Without a pipe layout I wouldn't be able to do the dynamic fluid analysis and losses calculation.

    Good luck with the replacement, I hope it works out.

  7. Likes northpole liked this post
  8. #7
    Regular Member Das's Avatar
    Join Date
    Jun 2010
    Location
    Yer Maws Bedroom
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    40 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Honda Civic

    Trim : ES,Panoramic Roof and Power Mirrors

    Engine : 1.8 iVtec

    Year : 2009

    Mileage : 67500

    Default

    1.8 never came with a twin exhaust so it will be from another Vec anyway, unless it is a custom built exhaust. 1.8 had an internal dia of 41mm, but if its cheap enough just get a stepped reducer cheaply off ebay.

  9. #8
    Regular Member
    Join Date
    Jan 2015
    Location
    derby
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : vectra c sri

    Trim : sri xp

    Engine : 1.9

    Year : 2007

    Default

    Thanks for all your advice chaps ��

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. SRI Exhaust Back Box Bore Size
    By Vaux-Man-G in forum Engine & Drivetrain
    Replies: 1
    Last Post: 18th June 2012, 15:20
  2. Exhaust bore size on 1.9 150bhp?? Help
    By simmo3187 in forum Diesel Engine related
    Replies: 6
    Last Post: 7th December 2011, 23:00
  3. exhaust bore size
    By craig1989 in forum Vectra C / Signum Car Chat
    Replies: 6
    Last Post: 28th May 2010, 09:27
  4. Exhaust bore size 2.2dti/1.9cdti
    By John LE in forum Diesel Engine related
    Replies: 0
    Last Post: 4th May 2010, 19:19
  5. VXR Exhaust Bore Size...
    By damian s in forum Vectra C / Signum Car Chat
    Replies: 3
    Last Post: 6th January 2010, 18:40

Visitors found this page by searching for:

Nobody landed on this page from a search engine, yet!

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •