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What is A.I.R.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ChevyCaGal, Feb 14, 2001.

  1. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    Ok...here's the deal. I am going to buy headers in the next week. Only thing is I have one small problem left to determine what ones to get. What the heck is A.I.R.? I have gotten so many different people saying what it is I am confused. Do I even need headers with the A.I.R. feature? To save you from clicking on my profile to see what I drive...it's an 86, K-5 Blazer Silverado, 350 small block, 5.7L, V8, 4x4, auto tranny steering wheel shift, factory a/c, Vin # L (some brands ask for that?)...think that covers the info that is needed? If not then um..ask me and I will tell you, that is if I know. I am attempting to put them on myself. So if I disappear from the site you'll know why...I was killed in a freak accident...death by exhaust....ha ha. But seriously this is my attempt to learn how to actually work on it. Any advice you all have is welcome! Oh yeah Happy Valentine's Day.....! And guys if you have a significant other, go for the flowers today...a free oil change is not the romance most of us are looking for! :-)

    "I love the sound rice burners make when ya run over them"
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    AIR is a part of your emission control system. What it is is an air pump that adds extra air to the exhaust stream. The system consists of a belt driven pump which will be on the passenger side front of your motor (normally). The air is pumped into a system of tubes that are ported into your exhaust manifolds. There is normally a port in each manifold, and there is a tube that goes around the back side of your motor to get to the driver's side manifold. There is also a check valve to keep the exhaust gas from back-flowing through the air pump. The extra air helps the catalytic converter do its thing (burning unburned fuel that gets into the exhaust). Your truck may or may not have it, but it probably does. Look for the air pump, and tubing ported into the manifolds. If you do have it, in order to stay legal, you need headers that have the ports for the AIR tubing.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    I believe it stands for Air Injection Reaction or something similar...clean air is injected into the exhasut as it enters the exhaust manifolds. Also, on some models, it is clean air is injected directly into the catalytic converter. Obviously it cuts down on emissions. If you have a visual inspection, you will need this of course.

    You can tell if you have it by counting accessories on the front of your motor, all belt driven. AC compressor (big black round thingy) Water pump (directly above crank pulley, front, center of motor) Crank Pulley (below water pump) Power steering pump (the one with the little cap that is removable, black) the Alternator (aluminum, passenger side top if I remember my Chevs right) and the AIR pump should be similar to alternator, but on the passenger side bottom of motor.

    FWIW, I pulled the AIR system off my truck (it was rusted out already) and the cat and I passed with no problems. Fine tuning is more important to passing than the added on components...except on a visual inspection if your state does them.


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  4. HarryH3

    HarryH3 1 ton status Author

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    If you have small steel tubes that go into a fitting on the exhaust manifolds at each exhaust port, then your truck has the AIR system. If so, you will have to get headers with the AIR fittings. Otherwise you won't pass the emission inspection there in California. [​IMG]

    The good news is that the AIR system uses VERY little HP and really makes a difference in how much garbage spews out the exhaust. By injecting extra oxygen into the hot exhaust stream, any leftover fuel is ignited and burned so there are fewer combustion byproducts going out the tail pipe. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    Cali sun don't look so great for all the cali guys and girls out there when inspection time comes. My stuff is all getting ripped off, but it was all disconnected when I got the truck. The worst draw back is dealing with changing it over and working around it, the only hp it drains is from the belt so can always take that off between inspects. We got rid of emmisions here a year ago so I'm happy... but before we knew a guy who worked for the state and we all got him drunk to get us exempted.... guy was drunk every weekend from June till august LOL

    1987 Chevy K5 Blazer- 350 TBI
     
  6. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    Thanks for the info....I appreciate it :-)

    "I love the sound rice burners make when ya run over them"
     
  7. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    This is sort of related. Does anyone know of a good shortie header with the A.I.R. bungs? The only ones I have seen are for '88 & up. That would be the new style (center bolt) heads. Right? I am looking for a set to fit the old SBC heads.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     
  8. Blazer1970

    Blazer1970 1/2 ton status

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    The old and new style heads (ALL small block Chevy heads) have the same bolt pattern for the exhaust manifolds/headers. The only difference might be the exact locations of the fittings for the AIR tubing.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  9. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Tim, only the intake side is different? The guy at Summit said the exh side was different as well. I guess I'll call back-you get someone different everytime.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     
  10. Blazer1970

    Blazer1970 1/2 ton status

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    Yes, intake is different. Exhaust is the same.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  11. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Cool, thanks.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     

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