Results 1 to 3 of 3

Exhaust Size

This is a discussion on Exhaust Size within the GTO forums, part of the Vehicle Specific category; We are now in an era where small block CI capacity is the same as a big block. So, what ...

  1. #1
    rednari
    Guest

    Exhaust Size

    We are now in an era where small block CI capacity is the same as a big block. So, what is going on with small block exhaust system to keep up. Most 500 CI BBs have 2 1/4-2 1/2 in. exhaust tubes and 3 1/2-4 in. collectors. So, the issue I am kicking around in my mind is: how far can we go with 1 and 3/4inch exhaust tubes and 3 in. collectors?? This especially important for FI motors

  2. #2
    Nitrous Tuner LS2Tuner's Avatar
    Join Date
    Aug 2006
    Location
    WestCoast AZ-CALI
    Posts
    4,763

    Silver
    05 Goat SMASHED

    Well the main issue your going to run into is the major loss of TQ when you step up the size. Plus with the major loss of back pressure it tends to make it worse on FI motors with reversion.

    If you are staying stock stroke save your money for a few hp gain your loss 20-30 tq which you'll feel in drivabilty. The few ponnies you won't even notice.

    Also if you plan on spraying it then a little bigger is also so better.

    The only quality big tube headers I know of that fit well are the Kooks 1 7/8" Primary and they have a 3" collector.


    What are your plans?

    Are you going to buy a LSX block and build a 454ci LS motor or are you just making a general ?...........
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  3. #3
    rednari
    Guest
    Yes, you raised some good points. Some years ago I used to race CBBs and know we needed large pipes to aid the flow. But the SB problem concerns the small heads which are OK for motors 400 CI and less. 500 CI are BB numbers and you need the bigger heads and ports to handle the flow.

    I am not an automotive engineer, but 500 HP, whether generated from a SB or BB have almost identical calorie requirements. In otherwords, the SB heads have to handle the same amount of air and fuel to get the same results.

    Actually, I was considering putting a BB in a GTO. The motor's height is OK, but devising an exhaust system is a PIA. BTW the babe in your signature has an a...s sent from heaven.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Question: LT1 Exhaust size?
    By 2tuff4u in forum LT1
    Replies: 2
    Last Post: 11-16-2011, 08:48 PM
  2. Stock Exhaust size
    By Z28_Driver in forum External Engine
    Replies: 7
    Last Post: 07-13-2011, 02:53 PM
  3. Question: stock exhaust size
    By egod in forum External Engine
    Replies: 5
    Last Post: 04-28-2009, 07:03 PM
  4. exhaust size
    By transam_9706 in forum External Engine
    Replies: 1
    Last Post: 04-06-2006, 05:17 PM
  5. Need help with outlet exhaust size!!
    By 02BlackWS6 in forum External Engine
    Replies: 0
    Last Post: 04-01-2006, 07:04 PM

Members who have read this thread: 0

There are no members to list at the moment.

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
  •