ckupas

my 74 was only tagged for PCV and TCS oh and it had that 1 year only stupid interlock relay, that quickly got removed from the system lol

gdh

Well finally got the vette out to install the canister, well in the direct sunlight and not being ticked there the original was. The officer with his flashlight didn't see it and I stupidly took his word for it. I replugged the one hose back into the carb and bought a new pcv with a 2 hose adapter for $9. Ran a hose from the valve cover into the air filter and done. I appreciate all of your help and advice. I'll probably order a crankcase check valve from Jegs and be finished as I couldn't get one here.

PhilaScott

I'd get a bicycle air pump and when he asks to see your air pump, just produce it. You can even offer to connect it.

cv67

They can do it out here, too. Scary .

Matter of time before my 67 becomes illegal to own. Actually its supposed ot have the smog pump on it. Without they could impound if they wanted. Messed up no?

Willytrash

From what I understand when you down shift a stick the motor goes into more of a vacuum which causes a slightly richer condition, hence the need for an air pump.

tracdogg2

You're close but that's not it. When you let off the gas to shift the mixture goes lean (CO) but the hydrocarbons (HC) skyrocket.
Mike

L84s R Us

Here in California it matter what your engine code says. Typically your car that was not originally registered in Ca would have an engine stamp code ofCKW or CKX. this alone would excempt you from ever having to put it on here.
Now on the other hand, if your engine code is CDH or CDJ, you would have to have it on once the laws change.

I have a 72 454, 4-speed and do not have my A.I.R. pump or any of the other equiptment on it.

The laws are starting to change though. we are excempt and do not have to get the cars smogged unless we sell the car. It is headed in thedirection of having to have on the car what it came from the factory with. We are not there yet, but I am affraid it will not be long.

Truth is I am not opposed to it. Except it might mess with the rodders that have newer engines in them. The smog equiptment has to be what the engine originally had on it.

If you are running a 63, 327, you are fine. But, if you are running a 69, 427, your rod would now need to have the 69 smog equiptment.

California is not as bad as I have heard it made out to be. Especially if you are in a county that is not one with a big city. I am not that lucky, but some of those counties have almost no requirements.

Jim Shea

Saginaw manufactured the A.I.R. pumps for General Motors back in the 70's. Here is the application for Corvettes in 1972. (This summary cannot be taken as gospel, but it came right from the company that manufactured the pump.)

1972 - A.I.R. system returned for most Corvettes except L48 engines with the "CKW" (350ci, 200hp, manual trans) and "CKX" (350ci, 200hp, auto trans) codes.

So according to Saginaw records the base engine 1972 Corvette with either manual or auto trans did NOT have an A.I.R. pump. You could have the "ec" emission control option (California?) that did require the A.I.R. pump (engine codes CDH or CDJ).

Jim

stpman

Jim

is that the same for 73?

Mike Ward

No. All '73 Corvettes had AIR, no exceptions.

stpman

Why do some 74's not have it then?

Jim Shea

One of the main reasons that Saginaw got out of the AIR business was that AIR pump useage was usually decided at the last minute. (The car companies hated adding the "parasitic" pump and all the added plumbing to their engine compartments." So if there was any way to fine tune the carburator, ignition system, etc, then they worked very hard to eliminate the need for the pump. Then at the last minute they might have to add the pump because they stastistically didn't meet that year's emission certification goals.

So that is why one year might have an AIR pump, then virtually the same engine the next year may have been "tweaked" enough to not require it.

With AIR pump useage bouncing around it was very difficult to run an efficient manufacturing plant. Going from feast to famine and back again in only a two or three year span. And it wasn't just Chevrolet engines, it was Pontiac, Cadillac, Buick, Oldsmobile, etc all bouncing around the emission targets. And of course the California and the Federal emission specifications might change from year to year as well.

So Saginaw sold their tooling and design to Holley and got out of the AIR business.
Jim

71406

Thanks Jim, interesting piece of history. Never understood why some cars had them and some did not.

BB72

http://www.e-laws.gov.on.ca/html/reg...s_980361_e.htm

http://www.ene.gov.on.ca/environment...OD_098206.html

http://www.ene.gov.on.ca/environment...OD_098041.html

jim2527

Move to Florida!! A few years back the state stopped doing emmisions testing because the fail rate was too low.

Mike Ward

I got your PM- seems you've answered your own questions.

BB72

The way I read it is the emissions only have to match the original standards that the car came with. So my BB only needs to pass 72 sb emission standards or just have the same emissions equipment that the small block came with?! Not sure there, then they throw is this 1980 emissions standard.