A/C and Air pump performance hits

Corvette Forums Corvette Classifieds Gallery Corvette News Member List Search Sponsors
Forum FAQ Calendars Contact Us Corvette Recalls TSBs Corvette Timeslips Register Login

A/C and Air pump performance hits

Printable Version

Corvette Forums >> Corvette Models >> Corvette C3 Forum >> A/C and Air pump performance hits

Page: [1] 2 3 4 next > >>

Message

<< Older Topic Newer Topic >>

A/C and Air pump performance hits - 7/5/2007 6:28:35 AM

Batmobile

Posts: 31
Joined: 7/4/2007
Status: offline

Has anyone discussed what performance gains can be had by removing the A/C and emissions equipment on an '82? I live in Michigan where there is no automobile emissions testing.

Also, when looking for headers all of the manufacturers state "For racing or off-road applications only". Is this just to cover their butts in the eyes of the EPA?

Post #: 1

RE: A/C and Air pump performance hits - 7/6/2007 5:57:29 AM

78buckshot

Posts: 654
Joined: 1/28/2007
From: Michigan
Status: offline

You could pull the A/C belt off but you won't notice anything, even with the A/C and A.I.R. belts removed you would be lucky to see 1-2 h.p., I would not change any of the emmissions on the 1982 'cause it's going to send results back to the ECM and at the very least give you a "check engine". If you want to get rid of any of your A/C parts let me know, I'm in Ann Arbor and will be working on the A/C in my '78 when I pull the motor.

(in reply to Batmobile)

Post #: 2

RE: A/C and Air pump performance hits - 7/6/2007 8:14:32 AM

Batmobile

Posts: 31
Joined: 7/4/2007
Status: offline

I thought that the air pump simply pumps air into the catalytic converter. How will the ECM know about it?

(in reply to Batmobile)

Post #: 3

RE: A/C and Air pump performance hits - 7/6/2007 8:19:42 AM

78buckshot

Posts: 654
Joined: 1/28/2007
From: Michigan
Status: offline

I'm not positive but I think the A.I.R. on the '82 also injects air into the exhaust manifold, if this is true then the oxygen sensor will most likely read rich.

(in reply to Batmobile)

Post #: 4

RE: A/C and Air pump performance hits - 7/7/2007 11:52:35 AM

cwb

Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline

quote:

ORIGINAL: 78buckshot

I'm not positive but I think the A.I.R. on the '82 also injects air into the exhaust manifold, if this is true then the oxygen sensor will most likely read rich.

GOOD answer. You're sharp.

_____________________________

Don''t know nuthin''; ain''t never got paid for wrenchin''...
[image]
http://www.stripers247.com/phpBB2/images/smilies/th_icon_stooges.gif[/image]

(in reply to 78buckshot)

Post #: 5

RE: A/C and Air pump performance hits - 7/7/2007 5:34:54 PM

73shark

Posts: 1097
Joined: 4/18/2006
Status: offline

There are also little pipes inside the exhaust manifolds that get the fresh air to the head of the exhaust valve. If you disable the AIR system, the heat will melt and mushroom the ends of these pipes and you'll have to cut them to remove from the manifold. I learned this the hard way in my younger and more impulsive days.

_____________________________

So many toys, so little time

(in reply to Batmobile)

Post #: 6

RE: A/C and Air pump performance hits - 7/7/2007 5:54:33 PM

cwb

Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline

quote:

ORIGINAL: 73shark

There are also little pipes inside the exhaust manifolds that get the fresh air to the head of the exhaust valve. If you disable the AIR system, the heat will melt and mushroom the ends of these pipes and you'll have to cut them to remove from the manifold. I learned this the hard way in my younger and more impulsive days.

I'm not understandin' this one there, 73...

Can you explain this just a little differently? Do you have a schematic?

_____________________________

Don''t know nuthin''; ain''t never got paid for wrenchin''...
[image]
http://www.stripers247.com/phpBB2/images/smilies/th_icon_stooges.gif[/image]

(in reply to 73shark)

Post #: 7

RE: A/C and Air pump performance hits - 7/7/2007 6:25:08 PM

78buckshot

Posts: 654
Joined: 1/28/2007
From: Michigan
Status: offline

Hey cwb, 73shark is describing the steel nipples that carry the A.I.R. air deeper into the exhaust manifold, their aimed at the port in the head to maximize the oxidation process of the gases. The stainless steel injector manifold mates to the exhaust manifold with inverted flare fittings and seats the flare to another short nipple inside the cast iron exhaust manifold. This is about as well as I can describe it.

(in reply to cwb)

Post #: 8

RE: A/C and Air pump performance hits - 7/7/2007 8:34:26 PM

Batmobile

Posts: 31
Joined: 7/4/2007
Status: offline

Wow. Thanks for the information! After tracing the lines from the pump, I saw that it also feeds into the air filter housing. I figure that the pump can't be too bad if it's giving the intake a little positive pressure.

(in reply to Batmobile)

Post #: 9

RE: A/C and Air pump performance hits - 7/7/2007 8:49:57 PM

C3 Starship

Posts: 4761
Joined: 7/25/2006
Status: offline

I believe that you'll find that the air pump draws from the filtered air from your air cleaner, not push air in. (this line is inside your filtered area) Although a hose from your air cleaner does draw air from your valve cover, through the pcv valve in the valve cover, to burn internal engine gasses. (this line is outside your filtered area)

_____________________________

1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response.
400+ hp, 454, M-22, 3.07

http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg

2007 H. D. Sportster, XL 883 EFI

(in reply to Batmobile)

Post #: 10