RE: JPOR: air pump stuff

["BRERETON, John" <John_BRERETON@xxxxxxxxxxxxx>]

So that's what that spidery thing was that I took off my motor when I
swapped it in.  Mine was made out of soft metal tubing that had some rips in
it where it tied into the manifold.  On my I6, the exhaust manifold had
those hollow bolts going in on the top of each exhaust port.  Since I was
putting an '82 motor in my '79 CJ, I didn't need the thing so I removed it
and replaced the hollow bolts with brass plugs I got from the hardware
store.  I took the air pump and hooked it directly to my catalytic
converter.  I figure it could still pump air into there and serve the same
purpose.  I pass inspection but can't tell you whether the air pump is
helping to do so.  I think I recently saw one of these "air pump manifolds"
in the "HELP" section at a local Pep Boys.  Don't know what car it was for
though.

-----Original Message-----
From: Maurice Cox [mailto:maurice_cox@hotmail.com]
Sent: Wednesday, September 13, 2000 7:10 AM
To: jeepoffroad@4x4wire.com
Subject: Re: JPOR: air pump stuff


****************Please Remember to snip your replies***************


>I've gotten two conflicting reports on this from the FSJ list, so
>I'm hoping you gurus can shed some light on the topic.
>
>I guess I'm a little confused about air pumps.  When I bought my '77
>Wag with a 401 V8 (now being rebuilt), it had brackets for an air
>pump, but no pump & no other equipment from the air pump setup.  I
>now have a pump, but nothing else.
>
>I read the TSM & understand basically what the air pump setup was for.
>It seems to indicate that even the 49-state engines had air pumps.  How
>necessary is it for a good, clean-running engine?  My Wag also had
>every single vacuum line cut & plugged, so I initially assumed the
>missing air pump setup was just another victim of the DSPO's knife.
>Now that I'm rebuilding the engine & have realized just how much of the
>air pump system I'm missing, I'm wondering if it's worth the trouble to
>try to obtain & reinstall all of it.
>
>This is going to be a tow rig / family cruiser, not a wheeling machine,
>so power & clean emissions are important even though Nebraska doesn't
>test them.

I don't consider myself a guru, but here's what I've gathered/thought 
through:

The air injection system has nothing to do with how clean the ENGINE runs, 
but does impact emmissions.  Air is injected into the exhaust stream so it 
can react with the exhaust gasses via the catalytic converter.  More air = 
more oxygen which allows for a higher CO2 / H20 content, versus CO and NO.

You can tell if you had an air injection system by looking at the exhaust 
manifolds.  If you see a total of 7 bolts/plugs on the outboard side of the 
manifolds (forget which side has 3 and which has 4) you had air injection.  
The original bolts are hollow to allow the air to get from the air manifold 
to the exaust manifold.  They're often brittle and plugged.  They also cost 
about $7 each from the dealer.

Hope this helps.

Mo
---------------
Maurice Cox
Cleveland, Ohio
81 CJ8  360/T19/NP205/D60s -- under construction
92 XJ   4.0/AX15/NP231
79 SJ   Just about gone

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