Discussion
richard jay said:
I am trying to find some information on the web for tuning Weber 32/36 DGV. I have it bolted to a Pinto 1993 with a fast road cam.
The problem is, the engine stalls when I rev up, then recovers and runs well at hig revs. I will supply more info if any one could help.
Where abouts are you ib the UK?.
rushdriver said:
I am trying to find some information on the web for tuning Weber 32/36 DGV. I have it bolted to a Pinto 1993 with a fast road cam.
The problem is, the engine stalls when I rev up, then recovers and runs well at hig revs. I will supply more info if any one could help.
Where abouts are you ib the UK?.
richard jay said:
Any advice for any simple checks I can make. I have the day off work tomorrow so I can tinker; it is either do that, or paint the kitchen green. Yukk!!!
Agree with Pigeon that it's worth checking the accelerator pump. You can do that by removing air filter and opening the throttle by hand at the carb.
If the accel pump's working you should see a small jet of petrol being squirted into the primary venturi.
I will go and have a check this afternoon.
Just a question, when you turn the mixture screw in are you enriching or weaken the mixture. I had the plugs out, they are a dark brown colour. the mixture screw is almost right in.
The other thing is the engine pops from the exhust when the engine is shut down; does any one have any thoughts on this?
Just a question, when you turn the mixture screw in are you enriching or weaken the mixture. I had the plugs out, they are a dark brown colour. the mixture screw is almost right in.
The other thing is the engine pops from the exhust when the engine is shut down; does any one have any thoughts on this?
The mixture screw only controls the mixture on the idle circuit, so that may be too big, or you are compensating by opening the throttle so it is running on the main circuit.
Try opening the idle mixture screw about 1.5 turns, then undo the idle speed screw until the throttles are completely shut, then wind on about a turn of throttle and try to start the car (you might have to use a bit of extra throttle to keep it running) and adjust the idle speed until it idles on it's own. If it doesn't you might need to change the idle jet. What size is it?
As for the hesitation on throttle opening, as stated it is probably the acceleration diaphragm, try replacing it first and then check the gap if it is adjustable.
The best thing from there will be the rolling road so mixtures can be taking at all speeds and loads.
Hope this helps.
Paul
Try opening the idle mixture screw about 1.5 turns, then undo the idle speed screw until the throttles are completely shut, then wind on about a turn of throttle and try to start the car (you might have to use a bit of extra throttle to keep it running) and adjust the idle speed until it idles on it's own. If it doesn't you might need to change the idle jet. What size is it?
As for the hesitation on throttle opening, as stated it is probably the acceleration diaphragm, try replacing it first and then check the gap if it is adjustable.
The best thing from there will be the rolling road so mixtures can be taking at all speeds and loads.
Hope this helps.
Paul
It's been many year's since I've had a play with the 32/36 weber but I got loads of info on how to tune them from :
Weber Carburettor manual
David Vizard Pinto tuning Manual
I bored mine ou to 36/39 (from 32/36), increased the main & secordary jet sizes, needle edges all the butterflies and threw away the cold start system - and also used plastercine to smooth the air intake at the top of the carb..
I don't remember the mixture being adjustable - as it had jets - I'd be 95% sure it does not have a mixture screw. I can't remember where the tickover adjustment is - but it's normally on the cable mechanism - a screw pushes against a base plate giving more revs..
Good luck - they are great fun.
Weber Carburettor manual
David Vizard Pinto tuning Manual
I bored mine ou to 36/39 (from 32/36), increased the main & secordary jet sizes, needle edges all the butterflies and threw away the cold start system - and also used plastercine to smooth the air intake at the top of the carb..
I don't remember the mixture being adjustable - as it had jets - I'd be 95% sure it does not have a mixture screw. I can't remember where the tickover adjustment is - but it's normally on the cable mechanism - a screw pushes against a base plate giving more revs..
Good luck - they are great fun.
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