I have a 2 litre Pinto with a DGVA. There are 2 barbs on the bottom of the carb which have vacuum sized pipes going to a fitting tapped into the underside of the manifold, probably into the water part of the manifold.

Can anyone tell me the purpose of the pipes and fitting please?

Many thanks.

 

John

That part of the manifold used to be heated by the coolant to avoid petrol vapour condensing, but iirc the waterflow was from the side of the manifold then out into the head.

Any idea of what car it was from ?  

It's a vacuum control valve for the EGR system.  Gets opened/closed at a specific coolant temp.

I think it should have a third port below those two which may have broken off. 

Number 5 on this page - Pinto OHC engines parts list: B9.10 - Emission Control - Valves/Hoses - fordopedia.org

http://ci.catcar.info/ford_2017_01/euro/305/z001011600.png

Tom, Like This ?

1 minute ago, Paulkp said:

http://ci.catcar.info/ford_2017_01/euro/305/z001011600.png

Tom, Like This ?

Yes, that's it.  One on ebay here as well.

OEM Ford DY173 Ported Vacuum Switch 74-96 Mustang Thunderbird F150 Crown Vic. for sale online | eBay

Thank you all very much indeed. Having searched for hours it is a relief to get answers. Thank you.

I cannot be sure what car the engine came from. I have it in `Marcos Martina (which I did not build). The car is based on a Mk4 Cortina. but the engine may be from an early Sierra according to Burton because of the electronic ignition.

There is indeed a third output, which is blanked off by the connector which serves one of the other outputs.

My next question is what do I do about this fitting? As I say it goes to the Weber. Is it necessary? What is the downside of joining the two carb barbs together and plugging the tapping in the manifold?

I am sorry to be dim, but learning fast.

John

Could you post a picture of the carb connections?  Are both of those pipes connected to the carb or have I misread that?

It's not necessary to keep.  I doubt the EGR would have been particularly effective even when it was new.  Though we would need to know exactly where that second pipe is going now, just in case it's been modified by the previous owner for a different function.

Thank you.

I'll add a photo tomorrow when I get the carb back from rebuilding.

When I took the carb off, the two vacuum pipes were attached to two separate barbs on the underneath of the carb.

The carb rebuilder said that the antistall device was not connected. I am wondering if the antistall now goes to one of the barbs, but I shall know more tomorrow.

I am very grateful indeed for your help.

IIRC the 2.0 Capris I had were fitted with the 32/36 DGAV progressive carb with an automatic choke, and Haynes published a Weber carb manual (of which i have a copy in Hampshire !) it has a chapter on the DGV types

Having had a quick look, the only reference I can find to anti stall suggests they were only used with air con or automatic cars.

Two pdfs of the sheets I got when I rebuilt one of these carbs with a Weber kit in the '70s.  In those days I messed around with heads/cams/exhausts/suspension etc ! (Never bothered with brakes !)  I used a firm in Luton with a rolling road to get it jetted correctly, I would think that your carb may well have jets set up with emissions in mind so no doubt you have this planned.

DGAV 32-36 01.pdf DGAV 32-36 02.pdf

Thank you all for your kind help. I am a bit further forward but would be grateful for your further views.

The mention of the Capri auto got me thinking. In 1978 when I was 29 I bought a new 2 litre Capri GL auto. With lack of foresight I did not take much interest in the carb, but I did, after 4 years of pounding motorways, get the Haynes manual. And I still have it!

And there on p98 is the very item I originally asked about. It is called a Ported Vacuum Switch and it has three outlets marked 1 D 2. In mine 2 is blanked off. It is as you have said part of the EGR.

From the diagrams in the manual it looks as if it controls vacuum from the carb to the EGR depending on temperature. There would have been a venturi vacuum amplifier as well.

I now have the carb back had here is a photo of it.

I have clearly confused myself about what is going on. It has been returned with vacuum hose between two ports as you can see. That was not there when I sent it. I must have taken the two hoses from the PVS off those two barbs when I removed the carb.

I wonder if this is what has happened:

When the builder put this engine in the car he must have removed the emission stuff, including the EGR. I suspect that the two PVS hoses originally went to the EGR and the carb. So with two hoses left over he connected them to the two ports now joined by the new hose. 

Subject to your thoughts I am tempted to leave the new hose in place and remove/plug the two old hoses from the PVS.

Like you I cannot find anything about an antistall device and it is not mentioned in the Capri Haynes manual even though it has many pages about the carb. I am not even sure what the new hose comes out of before it goes to the port near the base. I cannot see that part on the exploded parts diagrams of the carb.

But I would be very grateful to know what you think, please.

Thank you for the point about jets being for an emissions engine. The builder letft paperwork about the jets he put in so I shall have another look at that.

Many thanks

John

 

 

Been doing some light reading :

Perhaps you need the Grandad manual '77-'84....

I think that is the anti stall device (or low vacuum enrichment diaphragm in the '85-'88 manual)  "Only fitted on certain variants".  The Ford Ford Capri manual suggests that "mainly automatic transmission variants".  The anti stall is connected to the vacuum in the inlet manifold.

There is also four diagrams of the Swedish system, one showing a two port pvs for EGR, and a more detailed diagram showing three PVS,  and two vacuum ports on the inlet manifold for exhaust emissions !  And then two other variant diagrams !!!

I do have a copy of the Capri manual, but when I transferred it to a loose leaf folder I only included pages of interest, which did not include P98, which I think may be the Swedish section ?

All this complicated carburettor stuff vindicates my decision to buy a 2.8i Capri....

Now that is very serious light reading. Thank you!

P98 is in the section "Emission control." There is no mentiuon of Sweden but there are two pages, 102 103, of vacuum diagrams for various US markets, including Californian ones with separate diagrams for cars with or without auto transmission and a/c. The diagrams are almost incomprehensible (to me) having multiple 2 and 3 port vacuum switches. Most have one port going to the distributor ( the D port.)

I feel fairly confident with my solution. Having the anti stall device fitted I might just as well connect it to vacuum. The old PVS is redundant. But it is interesting that there are several Pinto inlet manifolds on ebay and most of them have the PVS fitted.

Ah, the 2.8i! I loved that car and had two, manual and the rare auto. Such happy memories.....but such a long time ago...I should have kept them, obviously......

John