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Do I really need this Air Pump?
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
Do I really need this Air Pump?
Does this friggin' thing really do anything or does it just add to the clutter under the hood? I'm wondering if someone can send me a picture of their L98 with and without it. I won't be able to look at it until later...my job has some kind of web blocker installed 
and I can't seem to get any pictures anymore. 
and I can't seem to get any pictures anymore.
Last edited by mdlfcrss; Aug 30, 2007 at 07:58 AM.
CF JASOC Member
Joined: Feb 2006
Posts: 8,040
Likes: 34
From: Downtown Annapolis, MD. The Future is where we all have to live. Let's not screw it up.
St. Jude Donor '08-'09-'10-'11
I've never seen one for an '84, but I have seen several newer C4s with this pulley to replace the AIR pump (off road use only it always says).
http://www.mamotorworks.com/corvette?frame=3.842
http://www.mamotorworks.com/corvette?frame=3.842
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Its there for startup emissions, it gets the cats cooking faster.
After the car goes to closed loop, it doesnt do much help.
After the car goes to closed loop, it doesnt do much help.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I'm guessing the O2 sensor doesn't "see" the cooler cat but it might not be as hot? I suppose the emissions would be a little higher right after switch-over without the hottest cat possible? Would the O2 sensor being cooler cause a temporary richer condition (on top of the cooler, less efficient cat)?
I've also seen the AIR helps heat the O2 sensor. If absent, how does that effect overall emissions/performance/etc....? What's the whole picture????
Last edited by GREGGPENN; Aug 20, 2007 at 06:26 PM.
Melting Slicks
Joined: Dec 2004
Posts: 2,954
Likes: 2
From: Obama=death for America
If you go for an emissions test, it probably won't pass the visibility test; meaning he'll be looking for it and if the pump's not there, you don't pass. But if you don't have emissions testing, removing the pump will do no harm whatsoever. If you look at my engine pictures, you'll see mine w/o the pump.
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Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
Thanks everyone. I'm not actually doing it for a performance gain, I just want to remove some of the clutter under the hood and make other things easier to work on... it sounds like a pretty bogus attempt at pollution control by our friends at GM. I already have long tubes and no pre cats, so inspection is already going to be a hassle but there's no "visual" so maybe I'll be ok.
Melting Slicks
Joined: Dec 2004
Posts: 2,954
Likes: 2
From: Obama=death for America
It's a good thing he doesn't live in Ca., for if he did, the smog ***** would have tossed a midget into the engine bay looking for any bolt that's not in emission compliance.
Racer
Joined: Jun 2005
Posts: 275
Likes: 0
From: Pembroke NH
I've never seen one for an '84, but I have seen several newer C4s with this pulley to replace the AIR pump (off road use only it always says).
http://www.mamotorworks.com/corvette?frame=3.842
http://www.mamotorworks.com/corvette?frame=3.842
The pump is easy to remove and the 85 belt fits the alteration.
Instructor
Joined: Apr 2007
Posts: 160
Likes: 0
From: N Canton Ohio
Bracket options?
Has anyone found a cheaper bracket? I would prefer one that is not chrome or polished. MidAmer seems to be the only place that offers this.
Melting Slicks
Joined: Jun 2006
Posts: 2,071
Likes: 147
From: S Nevada
Sheesh, I failed emissions on my dd because a vacuum hose from the charcoal cannister was disconnected. Some emission controls are not only good for the environment but actually help your fuel economy. I saw an interesting hot rod magazine article, the guy did some step by step performance mods followed by dyno runs on his 04 GTO. One of the more interesting was only a 6 hp loss when he hooked up the catalytic converters. I dont think it hurt him too much as he ended up pushing the performance to over 600 hp. Pump gas and emissions legal.
Burning Brakes
Joined: Jan 2007
Posts: 921
Likes: 0
From: Houston TX
Burning Brakes
Joined: Aug 2003
Posts: 899
Likes: 0
From: Copperas Cove TX
Intermediate
Joined: Mar 2007
Posts: 45
Likes: 0
From: inman sc
On my 86 vette, I removed all the plumbing going to the smog pump, and taping up the wiring. Next project was to remove the smog pump and taking vanes out of it, cleaning it up, and reinstalling it. works as good as the pump eliminator and it don't cost anything at all.