smog spagetti

[chris989]

I have a 78 f250 with the 400. The carb needs rebuilding and I was wondering how much of this smog stuff can be removed. I do not have a smog test where i live and was thinking about just saving and storing the parts.

Currently, the smog pump has no belt, and the truck has headers. I guess my question is, Can this labyrinth of hoses be reduced to what is truly necessary?

For example, There is a vent hose from the carb to a box below the battery, there is another bundle of small vacuum hose attached as well. If I remove this will it cause some type of fuel vacuum lock? There is another one of these boxes on the frame under the passenger door.

Anyway, If anyone has desmogged their 400, It would great for some insight.

Thanks,
Chris

 

[Turtle400]

I have a 78 f250 with the 400. The carb needs rebuilding and I was wondering how much of this smog stuff can be removed. I do not have a smog test where i live and was thinking about just saving and storing the parts.

Currently, the smog pump has no belt, and the truck has headers. I guess my question is, Can this labyrinth of hoses be reduced to what is truly necessary?

For example, There is a vent hose from the carb to a box below the battery, there is another bundle of small vacuum hose attached as well. If I remove this will it cause some type of fuel vacuum lock? There is another one of these boxes on the frame under the passenger door.

Anyway, If anyone has desmogged their 400, It would great for some insight.

Thanks,
Chris

I have a 77 with a 400, and the only smog stuff i had was a EGR. I am not sure on the rest of the parts you stated.

 

[DNFXDLI]

Depends on where the truck was destined for as far as what emissions items were installed. The one box is a charcoal canister that stops fuel tank vapors from escaping to the atmosphere, keeping that is a good idea.

 

[m78]

Damn french canadians and there spagetti.

 

[DNFXDLI]

Damn french canadians and there spagetti.

Damn them anyway for anything!

 

[m78]

Damn them anyway for anything!

Keep um in the east !

 

[DNFXDLI]

And let them freeze in the dark

 

[Mil1ion]

If you have speed control or AC then you need the reservoir mounted below the battery

 

[chris989]

If you have speed control or AC then you need the reservoir mounted below the battery

I do have AC, thank you for the reply, Today I will begin the trace and replace for all the cracking hose.

 

[Alvin in AZ]

All that stuff was just "added on" for the gov't, the Ford engineers didn't
want it on there anymore than you do.

All of it can be gotten rid of but the carburetor might be a little too lean
in the low speed circuit. If you've got a 2100/2150 and just off-idle it
stumbles/hesitates, I got a fix for that. xD

There's one smog thing inside the engine tho. :/
It's the retarded cam timing built into the timing set.
It's cheap and easy to swap that out.
Are you game?

Hey, get rid of all that crap and the old clunker will get better gas mileage
and have more power, both. BTDT with a '75 360FE.

Alvin in AZ

 

[chris989]

Alvin,

The port in the intake, that the smog pump connects to, Is that somehow exhaust?

Eventually I will purchase an intake, but for now can i plug this port? It appears to be close to an inch i diameter.

 

[Alvin in AZ]

The port in the intake, that the smog pump connects to,
Is that somehow exhaust?
...for now can i plug this port?
It appears to be close to an inch in diameter.

I don't know. But I don't think so. xD

Scrape the hole clean and measure it and go from there?
Is the hole already threaded?
How dirty is it?

---------------------

There was a ~9/16" hole in the intake manifold half-way-under the edge
of the carburetor on the 360FE. I plugged it using a 3/8" pipe tap and a
cast iron pipe plug. It was an EGR hole and -definitely- exhaust, it was
caked with a thick black crust. Last thing, I filed the soft cast iron pipe
plug really-flat.

Used cast iron on purpose for its thermal expansion characteristics. xD

-------------------------
Paraphrased from Lange's Handbook of Chemistry:
Thermal Expansion x10^6 of Alloys of...

Fe = 10 to 12 (stainless can be ~16)
Mg = 16
Cu = 16.5 to 19
Zn = 20 to 21
Al = 22 to 26 <-- ~double iron and steel LOL

-------------------------
Front:
http://www.panix.com/~alvinj/file12/DoALL1.jpg
Back:
http://www.panix.com/~alvinj/file12/DoALL2.jpg
(scanned big for printing

Alvin in AZ
ps- We dohn need no steenkeen choke or Dent Side EGR...

The "boss" just in front of the carburetor's rear stud is where
the EGR's gases came out. Boy, you know, that's really good
stuff to have going into your intake manifold.

http://www.youtube.com/watch?v=VqomZQMZQCQ

 

[chris989]

The port is threaded, I will just plug it,

 

[Mil1ion]

Anything attached to the air pump can be sealed or removed.
All it does is suck the fumes from the exhaust and pump it back into the engine.
Keep the reservoir, the AC system needs it.

 

[Alvin in AZ]

Anything attached to the air pump can be sealed or removed.

x2

All {the EGR} does is {let} the fumes from the exhaust {into the intake}.

There. Fixed it for you, Dennis.

The air-pump pumps fresh air -into- the exhaust.

At first the air is pumped into the exhaust -before- the Cadillac-converter
to jump-start the catalyst.

Later (I don't know when... after it gets hot? I guess? then it switches
to dumping the air into the exhaust -behind- the Cadillac-converter.

Keep the reservoir, the AC system needs it.

x2

Alvin in AZ
ps-
When they first came out, that's what the old timers called 'em. xD
"yeah, makes a little car use up gasoline like a friggin Cadillac "
-that's Alvin agreein' with 'em instead of arguin' with 'em.