RE: A/C and Air pump performance hits

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RE: A/C and Air pump performance hits

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

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RE: A/C and Air pump performance hits - 7/16/2007 8:06:22 PM

Batmobile

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

I meant to say, "This weekend I confirmed...."

(in reply to Batmobile)

Post #: 31

RE: A/C and Air pump performance hits - 7/16/2007 8:29:38 PM

C3 Starship

Posts: 4686
Joined: 7/25/2006
Status: offline

I'm goin' to read a little deeper, and let ya know what I find. It doesn't make sense to me that it would blow into the intake, but I'll try to find out for ya. I'm not real sharp on smog stuff, that's why I have the manual. I have to deal with that "Schmidt" here in Reno, and usually let a mech figure it out when it's time to do a smog check. I should do the preliminary stuff myself though, I'd save a few bucks.

_____________________________

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 #: 32

RE: A/C and Air pump performance hits - 7/16/2007 9:00:16 PM

C3 Starship

Posts: 4686
Joined: 7/25/2006
Status: offline

Here's what I found.
The A.I.R. pump blows air into the exhaust manifold, near the exhaust valves. There is a check valve in the system. You can remove the check valve and blow through it, toward the exhaust manifold. If you get air flow when you blow though the other way, the check valve is bad and should be replaced. I don't find any indication of the pump blowing into the intake at any point, under normal operating conditions.
In case you are interested, I got my manual from Ecklers. It is the 1980 Corvette Shop Manual.
A really good book to have on hand.

(in reply to C3 Starship)

Post #: 33

RE: A/C and Air pump performance hits - 7/17/2007 1:56:13 PM

73shark

Posts: 1055
Joined: 4/18/2006
Status: offline

Starship covered it pretty well. The only connection to the intake was for vacuum to the air diverter valve that released excess air from the pump upon deceleration to prevent exhaust backfire due to an oxygen rich exhaust. If you have air going into the intake manifold, air cleaner, or anywhere but the exhaust manifold, something's wrong. At least base upon the '73 hookup.
A factory manual is a very good thing to have if you are going to maintain these cars.