DGAV vacuum pipes on my Pinto.

[paintman]

Got a 2000 pinto in my Hood I just bought, with a webber DGAV. Its fine when warm but a bu**er to start from cold! The problem could be the vaccum pipes as the vac. switch on the water pipe which has 2 outlets only has 1 pipe attached!!  If I seal it off it cuts out!

Also....should the pipe from the carb outlet under the bi-metal strip housing (by rocker cover)  join into the water vac, switch via a tee joiner and then continue on to the distributor?? 

I'm very confused......Tony

 

['The Gaffer']

Sorry mate, just as confused as you .

Did a little research though and as I'm sure you know by now the DGAV has a water controlled choke.

It may just need a rebuild [or] to get coolant to go in and out of the coolant operated choke on the Weber DGAV carb, you will need to install a "T" in the heater hose before the heater box and another "T" after the heater box but on the engine side of the heater control valve so coolant will circulate through the choke even when the heater is off.

That's of course assuming you have a heater?

Anyway, I hope someone will be along with some practical experience.

[dave_bence]

Yipes, this takes me back to the fun and games I had getting the Pinto in my donor Sierra (for the Xtreme) to run right.

Like Phil says, the automatic choke on the DGAV needs a constant supply of coolant running through it to take the choke off. The coolant comes out of the cylinder head, out though the inlet manifold, through the auto choke housing and into the heater matrix. Another pipe then runs from the heater matrix back down to the small stub on the water pump.

The Sierra (like most recent cars) doesn't use a water valve to control the temperature of cars heater - coolant always runs through the matrix, ensuring a constant flow through the auto choke as well. The heater temperature is controlled by a flap that directs the incoming air either though or around the heater matrix. If your car has a heater water valve, it will need the tee pieces Phil mentioned.

Regarding all the vacuum pipes and gubbins, I only used two of the fittings on the inlet manifold. If you have a brake servo, youll need three. The servo connects to the threaded horizontal stub on the manifold. Slightly further forward from that is a Tee piece, with a large stub pointing down and a smaller stub pointing up. The large stub connects to the crankcase breather and the smaller stub goes straight to the distributor for the vacuum advance.

All other pipes and stubs on the inlet manifold and on the valve in the choke coolant circuit were blanked off. Very often, the DGAV is used to replace other worn Weber carbs or the awful Pierburg models. These had lots of pipes and valves that a DGAV doesn't need.

It could be that if your choke is not releasing properly, the engine needs the air coming in from one of your open holes to counteract the rich mixture from the carb.

Are you bringing the car to the meet this weekend? I'd be happy to take a look under the bonnet. I also still have a Haynes manual for the Sierra, which may contain useful photos or diagrams. You're welcome to borrow it if you like.

[paintman]

Thanks for all your help so far lads, all other ideas welcome.

Another thing that might be connected....it struggles to rev. over 4000 r.p.m. in gear whilst acceleration is brisk up to there.! Don't know if it is running weak at top end or is it the gear ratios on a 5 speed box being high?  What should it rev. too in standard  set up....any idea anyone?

   Tony

['The Gaffer']

Vacuum pipes maybe leaking, missing, misplaced?

Could be loads of things really. Drop the car along to a meet and it looks like 'Guru' Dave might take a look .

[dave_bence]

Managed to find my Sierra manual:

Unless you've got a low-compression Transit or P100 engine, a carburettored Pinto produces max power at 5200-5400 RPM.

Max continuous engine speed is 5850 RPM. I used to take mine briefly to 6000 through the gears.

Top gear performance is blunted due to the very tall 5th gear on a type 9 'box and the poor aerodynamics of any "Seven" style car.

[paintman]

Would i be better off with a 4 speed box then? Until I sort out my carb. and vac. problems i'm not getting more than 4000 r.p.m. but i got a gasket set coming for the carb. and it was retarded with no vac. advance so it should go a bit better then i hope!!   

[paintman]

With reference to my last posting i ment to have said retarded not censored!!  (senile dementia setting in fast i fear!)  Tony

[paintman]

 I don't believe this.....every time i key r.e.t.a.r.d.e.d. (without the dots) it comes out as censoreded. There's something seriously wrong with this keyboard!!

Sorry about this series of unprofessional postings.....i'm going to bed!!!

    Tony

['The Gaffer']

I don't believe this.....every time i key r.e.t.a.r.d.e.d. (without the dots) it comes out as censoreded. There's something seriously wrong with this keyboard!!

Sorry about this series of unprofessional postings.....i'm going to bed!!!

    Tony

Haha, its not your keyboard Tony. This website has a little gadjet full of words that it believes may offend and automatically censores them.

Try 'backward' instead of r.e.t.a.r.d.e.d 

[YellaBelly]

Nice idea Phil, but the words;

"......and discovered that my ignition was too 'backward' might not quite work

JB

['The Gaffer']

Nice idea Phil, but the words;

"......and discovered that my ignition was too 'backward' might not quite work

JB

Lol good point

Retarded should work now