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After reading several posts and other websites about upgrading from SU's to the Weber Downdraft DGV only to have a hesitation when you stomp on the pedal that seemed incurable, I was beginning to think I should have stuck with SUs.
Well, a lot of people bashed the DGV (it doesn't work) no doubt in the passion/anger of having to sell the weber and go back to SU's that don't have the problem.
I'm here to confirm the DGV is an excellent carb for your MG.
Researching into it further I found an article by someone saying a hesitation with a DGV means its improperly jetted for your engine....that someone was spot on correct!
It seems that .050 and .055 primary idle jets are whats usually installed by weber. These will most often be the cause of hesitation in MGA and MGB motors.
Upgrading to a bigger jet, then adjusting your idle mixture is the key.
After reading about this I told my Dad who restores british autos for a living. One of his customers MGA had been fitted with a DGV and they were about to go back to SU's when I let him know what I found.
This MGA had a .050 idle jet. They installed a .055 and the problem completely went away.
I had read that even a .055 on an alpine (1800cc) was not enough and you'd still have hesitation. Thinking that the problem was cured on the MGA (1600cc) with a .055 I figured I'd try a .060 since that fixed the issue on the alpine sized motor being the same as the mgb at 1800cc.
That was a correct assumption. I pulled a .055 out of my DGV, replaced it with the .060 started it up. This was interesting because now the car would not start without the choke engaged. It would always start before without the choke. After warming it up, I stomped on it and there was some hesitation but not nearly as much as before.
I then adjusted my mixture and found it had been originally turned out 1.25 turns. I adjusted it to 1.5 turns (idles perfectly at 900 rpm now too) then stomped on it.
Hesitation bye bye!
I hope this helps anyone else out that was in my situation.
The DGV is a great carb and when properly jetted/tuned runs very nice on the MG engines.
Well, a lot of people bashed the DGV (it doesn't work) no doubt in the passion/anger of having to sell the weber and go back to SU's that don't have the problem.
I'm here to confirm the DGV is an excellent carb for your MG.
Researching into it further I found an article by someone saying a hesitation with a DGV means its improperly jetted for your engine....that someone was spot on correct!
It seems that .050 and .055 primary idle jets are whats usually installed by weber. These will most often be the cause of hesitation in MGA and MGB motors.
Upgrading to a bigger jet, then adjusting your idle mixture is the key.
After reading about this I told my Dad who restores british autos for a living. One of his customers MGA had been fitted with a DGV and they were about to go back to SU's when I let him know what I found.
This MGA had a .050 idle jet. They installed a .055 and the problem completely went away.
I had read that even a .055 on an alpine (1800cc) was not enough and you'd still have hesitation. Thinking that the problem was cured on the MGA (1600cc) with a .055 I figured I'd try a .060 since that fixed the issue on the alpine sized motor being the same as the mgb at 1800cc.
That was a correct assumption. I pulled a .055 out of my DGV, replaced it with the .060 started it up. This was interesting because now the car would not start without the choke engaged. It would always start before without the choke. After warming it up, I stomped on it and there was some hesitation but not nearly as much as before.
I then adjusted my mixture and found it had been originally turned out 1.25 turns. I adjusted it to 1.5 turns (idles perfectly at 900 rpm now too) then stomped on it.
Hesitation bye bye!
I hope this helps anyone else out that was in my situation.
The DGV is a great carb and when properly jetted/tuned runs very nice on the MG engines.
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