A.I.R. Deletion?
Thread Starter
|
Mountain Pass
Joined: Feb 2003
Posts: 238
Likes: 0
From: SoCal
A.I.R. Deletion?
I have an 89 Ford F350 crew cab with 5.8 EFI/C6/4.10. The 5.8 has the A.I.R. tubes going to each exhaust port in addtion to the A.I.R. fitting at the back of the head. Why does my truck have this? I've done research and some just have the AIR connection to the back if the head and some have both, like mine. I feel it is because of the 4.10 gear ratio.
Anywhoo, I would like to delete the A.I.R tubes going to the exhaust ports, while keeping the fitting at the head. Is there any reason why I need to keep it? I do have to go through smog every two years, here in CA, but would the average smog guy know THIS truck is supposed to have the AIR tubes to the exhaust? Remember, it does have the fitting at the back of the head.
What do I need to do to delete this??
Thanks
Anywhoo, I would like to delete the A.I.R tubes going to the exhaust ports, while keeping the fitting at the head. Is there any reason why I need to keep it? I do have to go through smog every two years, here in CA, but would the average smog guy know THIS truck is supposed to have the AIR tubes to the exhaust? Remember, it does have the fitting at the back of the head.
What do I need to do to delete this??
Thanks
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
A.I.R. Deletion?
Why go to the trouble? Are they causing some problem being there? The smog inspector doesn't have to recognize that you've deleted something - if it affects your emissions, he doesn't have to know why to fail you.
Laughing Gas
Joined: Nov 2001
Posts: 807
Likes: 1
From: -
A.I.R. Deletion?
I have the same setup with my truck. If you are looking for a power gain, get some Gibson tri-y headers. I did, they were a breeze to install (I have done many a header install, and these were great). The smog pump in your engine draws negligable power, 5 hp at the most to run, and it does keep the emissions down by allowing a more thorough burn of exhaust gases. There should be a tube that runs down to your cat too. Again, why the delete?
Thread Starter
|
Mountain Pass
Joined: Feb 2003
Posts: 238
Likes: 0
From: SoCal
A.I.R. Deletion?
My theory:
3.55 gear ratio = A.I.R. to the back of the head.
4.10 gear ratio = 2 A.I.R. setups: A.I.R. to the back of the head +++ A.I.R. to each exhaust port (this is the part I want to remove).
I beleive Ford had to add the "extra" A.I.R. system to the exhaust ports because 4.10 trucks were dirtier than 3.55 trucks at a certain speed during Federal emissions certification.
The reason:
1. my truck has had a long history of pinging at a steady-state speed. Not solveable by Ford. Some mechanic mentioned A.I.R. at exhaust might be related.
2. My truck has a history of cracked exhaust manifolds. Maybe related to #1.
3. Too much clutter under the hood. Removing the A.I.R. from the exhaust ports will clean it up.
Passing smog: I simply want to make my truck have the same smog equipment as a 3.55 gear ratio truck, with the A.I.R. system connected to the back of the head. I belive my truck will still pass a smog check.
3.55 gear ratio = A.I.R. to the back of the head.
4.10 gear ratio = 2 A.I.R. setups: A.I.R. to the back of the head +++ A.I.R. to each exhaust port (this is the part I want to remove).
I beleive Ford had to add the "extra" A.I.R. system to the exhaust ports because 4.10 trucks were dirtier than 3.55 trucks at a certain speed during Federal emissions certification.
The reason:
1. my truck has had a long history of pinging at a steady-state speed. Not solveable by Ford. Some mechanic mentioned A.I.R. at exhaust might be related.
2. My truck has a history of cracked exhaust manifolds. Maybe related to #1.
3. Too much clutter under the hood. Removing the A.I.R. from the exhaust ports will clean it up.
Passing smog: I simply want to make my truck have the same smog equipment as a 3.55 gear ratio truck, with the A.I.R. system connected to the back of the head. I belive my truck will still pass a smog check.
Thread Starter
|
Mountain Pass
Joined: Feb 2003
Posts: 238
Likes: 0
From: SoCal
A.I.R. Deletion?
Originally posted by rabidranger
I have the same setup with my truck. If you are looking for a power gain, get some Gibson tri-y headers.
I have the same setup with my truck. If you are looking for a power gain, get some Gibson tri-y headers.
Posting Guru
Joined: Dec 2002
Posts: 1,297
Likes: 3
From: Billings MT
A.I.R. Deletion?
As for your problem with manifolds, there are several posts around here on that. It is a typical 460 problem. Usually it is the pass side. One theory was that the CAT was clogged and kept too much heat in the rear cylinders. I've seen many 460's with cracked exhaust manifolds and broken bolts at the rear of the engine. If you did a catback system, did you replace the cat? If not, you should look into it. If you keep the entire set up, you might get by with gutting the cat and nobody would know. Again, that depends on how well your motor. If you delete half of the system, you will be increasing your chances at failing emissions. I have the same set up you are talking about and don't have any problem with it. Does the ping happen when cold and hot at highway speed? I had a friend that had a baffle go in the cat and it was really annoying, sounded like advance timing, but it was the cat.
Thread
Thread Starter
Forum
Replies
Last Post
1995F250351
1987 - 1996 F150 & Larger F-Series Trucks
6
Oct 19, 2015 07:20 PM
BroncoBilt
1978 - 1996 Big Bronco
10
Mar 29, 2015 10:11 PM
Rocinante
1987 - 1996 F150 & Larger F-Series Trucks
5
Aug 14, 2014 10:02 AM
bigmac776
1987 - 1996 F150 & Larger F-Series Trucks
17
Mar 10, 2005 08:57 AM
