38 dgas/dgms carburetor issue

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Mr B
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Car(s): Four 3 litre Capri's and 2 Mark 1 GXL's

38 dgas/dgms carburetor issue

Postby Mr B » Sat Nov 11, 2017 8:55 pm

Hi all,

I have a 1980 3 litre ghia and have a Weber 38 dgms (manual choke) feeding the fire, only problem is to get a smooth idle the mixture screws need to be almost 7 turns out, bought the carb brand new from Burton power around 3 year's ago, and it's always been the same, according to literature the most they should be is 1 and a half to 2 turns out, checked the idle jet's against an original carb and they match (45''s) also checked for vacuum leaks and none can be found

Any ideas guy's?

Wayne

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Peter-S
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Re: 38 dgas/dgms carburetor issue

Postby Peter-S » Sat Nov 11, 2017 10:47 pm

Define a full turn. If the screw slot is level and you turn it anti clockwise until it is level again that will be half a turn so it will be round once more for a full turn. Apologies if you already realise that but it might mean you are only turning the screw around three turns out, which is about what I've always done with the 38 on my 2.0.
If it's running well and mixture is OK for the MOT tester than may be no need to worry.
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Mr B
Posts: 107
Joined: Fri Dec 09, 2016 9:07 am
Car(s): Four 3 litre Capri's and 2 Mark 1 GXL's

Re: 38 dgas/dgms carburetor issue

Postby Mr B » Sat Nov 11, 2017 11:12 pm

Hi Peter, thanks for replying mate, yep nearly 7 whole turns, I use a screw driver with writing on one side of the handle, half a turn writing on bottom full turn writing back up on top if that makes sense, other Weber carbs I've had have never got anywhere near 7 turns out for a smooth idle, totally standard engine only mod is a K & N air cleaner, when I took her for MOT they didn't put her on an emissions test apparently she is too old and doesn't require it

Wayne

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Peter-S
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Re: 38 dgas/dgms carburetor issue

Postby Peter-S » Wed Nov 15, 2017 6:57 pm

Just a thought, you haven't got more than one spacer plate between the carb and manifold have you?
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Mr B
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Joined: Fri Dec 09, 2016 9:07 am
Car(s): Four 3 litre Capri's and 2 Mark 1 GXL's

Re: 38 dgas/dgms carburetor issue

Postby Mr B » Wed Nov 15, 2017 8:46 pm

Hi mate,

just the standard spacer with the pipe connection that goes to the pcv valve on the rocker cover

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Peter-S
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Re: 38 dgas/dgms carburetor issue

Postby Peter-S » Sun Nov 19, 2017 5:47 pm

As you may see elsewhere I've just put a new 38 on my 2.0 as the old one was no longer running well. With your settings in mind I would out the mixture screws 3 full turns and left it to warm up. Seemed to be running reasonably well but I put my Gunson tester on it and it was way too rich. Had to back off by about 1 1/2 turns. I know yours is on a 3.0 but I'm a bit perplexed. Be interesting to know what your emissions are.
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