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What is is this thing?? w/ pic

My smog system on my 85 was going bad, the valves were making the exhaust pop. So I ripped it off and screw emisions. Don't worrying about polluting. The smog injection was just GM's BS answer to emissions laws. All it does is pumps clean air into exhaust. I could be wrong, but seems pointless to me.
 
Ok here is the Skinny. they only Legal smog car with true dual exhaust is a mustang application. As far as the AIS pump it adds air into the exhast pre catalitic converter to aid in the catalyst effect. adding o2 creates higher temps. that is all it does. If you are 86ing the Cats for more power(less back pressure) remove the pump and lines( you will not pass smog anyways without the cats) if you are keeping the Cats in the car I would keep it in and operating otherwise you could have poorly operating converters and they can plug up(not running hot enough) or come apart internally. the converters on the car are desinged with the AIS system in mind. If you want to do it right get a single High flow Converter, smog legal headers and run 2 to 1 exhaust with 3 to 3.5 inch pipes. you probably have 02 sensors in there?

I was a smog tech for years and still retained a bunch of useless info.

P.S. true High horsepower engines only produce lots of smog at low rpms. they burn really clean with the throttle open.
 
http://en.wikipedia.org/wiki/Egr
http://en.wikipedia.org/wiki/Air_injection_reactor

those give you the basics on your 2 questions. ssped is right about repercussions caused by yanking one part of the emissions system off. The system components are designed to complement each other.

I pulled the A.I.R. system off my '75 Blazer. My exhaust system didn't have catalytic converters when I bought it about 7 years ago. I plugged the resulting holes in my exhaust manifold with some threaded plug things I found at the hardware store. My motivation was related to aesthetics and the fact that the system was completely broken at the time. Now i'm getting ready to research a diesel system and bio diesel.
 
Only pre cat or 1 ton and larger trucks and burbs. there was a weight regulation on emissions in the early years. most burbs are probably heavy enough not to run cats. I dont remember all the particulars but in the Books there was only one legal factory dual set up in a car or light truck. it was mustangs. (police stuff mostly I think)
 
We had an 86 3/4 ton with factory duals and dual "smog" pumps my dad bought new it's the only one I've ever seen it was a weird truck it had 56" springs and a 14bolt FF SM465/NP205 . but it was a 20 series and had a 10-bolt frontend.


Alot of diesel blazers and Pickups came with factory duals
 
yep and every "Civy" truck I've seen with a 6.2 has had duals also
 
Yeah, I don't believe duals were even optional on the 6.2 trucks, seem to be standard equipment. (up to at least '86 anyways)
 
Your kidding?

I hate to say it but "You Boneheads":haha: Just kidding I know you just over looked CUCV's are DIESEL. I.E. no smog.
 
ssped said:
I hate to say it but "You Boneheads":haha: Just kidding I know you just over looked CUCV's are DIESEL. I.E. no smog.
Click to expand...


No we didn't :rolleyes:

yellowK20yep and every "Civy" truck I've seen with a 6.2 has had duals alsoToday 09:38 AM

Today 09:38 AM84CUCVAll the cucvs i have seen have dualsToday 08:24 AM



:doah: :doah: :doah: maybe we should have been a bit clearer
 
Uh 6.2 is a diesel. No Smog. We are talking smog legal dual exhaust.
 
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