Injection Nozzle (emissions)

Has anyone here seen one of these (number 6 in the picture)? Or are they already pressed into the head? The manual doesn't mention them other than to show one in this picture.

 

Worth: That's the air injection nozzle for the air pump. They were always used on '68 :v6: in CA, and prolly some other states that required them. Kaiser had all the heads cast with the ports in them, but for states that didn't require an AIR they just put bolts in the holes. My '68 has the bolts as here in AZ they were what they called "49 State" vehicles (didn't have to conform to CA regs.). Also in CA, the :v6: was 7.5/1 compression ratio, while the "'49 State" ones were 9.5/1.

 

Jeep/GM # 3880812 probably discontinued
they are replaceable, but...........
SOB to get out of the head, can get really crusty in there
I think most folks thread the tubes in and let it be

 

Mine are still in my original heads Worth, if you need one and I can get them out in tack you can have them. I am not using my original heads as I have a spare set that did not have them and those are the ones I'm putting back on my engine.

 

Isn't the part that Worth described a spacer for the injection tubes to seat against? In other words, the ports machined into the manifold are deeper than the flared fitting penetration?

 

Hey Mike. Would it be easy to pull one out and take a picture of it next to a ruler?

Jim, if that'll work, I'll do it. Technically, though, it wouldn't be sealed would it?

 

Worth,
I recall the same parts being offered on eBay before and another vehicle enthusiast website, probably one having to do with Buicks or Oldsmobiles. An internet search might yield something.

 

Worth I will try to take one out tommorrow AM!!

No these units are shoved all the way into the exhaust port and actually would be a flow restrictor to the exhaust port.

 

We're probably talking about the same thing but the part Worth is talking about is technically called an extension. It will obviously offer some restriction but its primary purpose (I believe) is to provide a surface for the flared tubing to seat against.

 

Beeser it will provide a seat for the distribution tube but it could do that and be an 1 1/2" shorter, its primary function here is to get fresh air directly in the middle of the exhaust flow and it does so by being literally in the middle of the exhaust port, and when I say a restictor I mean it blocks at least 15% of the exhaust port opening, these things could do nothing but hender power output and clog the exhaust to some degree!!

 

We're obviously on a different page Mcruff. Any extension or nozzle length less than the distance from where it bottoms out in the manifold to the flared tube would not allow a positive seating surface. At least, I don't know how it could.

 

It does not bottom out in the exhaust port but it obstructs most of it. This things slides thru the top of the head down into the port it stops on a seat inside the head not in the port, the rest of the assembly then tightens up on the seat.
What I'm getting at is when you look into the exhaust port all you can see is this tube obstructing most of your view, the seating of it is irrelavent!!

Beeser go back and look at part 6 in the illustration, the seat is at the top of the part where it is larger in diameter (thats the flared seat) the rest of the length just hangs in the middle of the exhaust port.

 

I give up. OK, the length is irrelevant.

 

Worth here is picture of the air injector, it came out pretty easy, if you want them you can have them. It is 1.900" long and .312 in diameter.
This thing hangs all the way thru the exhaust port within 1/8" of the exhaust valve.

 

Well, if Worth doesn't want them, I could certainly use them.

 

Beezer, in Calif, do you still have to have all the air pump equipment on the engine even though the vehicle is old enough to be emissions exempt?

 

No, not as I understand it. I'm only interested for restoration purposes.

 

Okay, I've found a cool resource but they don't have an active web site. The company is "HELP Smog Parts." They actually have the nozzles we've been talking about here. Their parts are new aftermarket. I just ordered six nozzles from them yesterday. Just now thinking about it, I probably should have ordered the rubber hoses from them too. Hmmm.

Anyway, here's their contact information:

HELP Smog Parts
1-800-544-4357

Thanks for the offer Mcruff.