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Downdraft Weber question
bumpy - 1/10/13 at 06:04 PM

When I took the air filter off my 2l Pinto engine. The top of the Weber looked like this.

So, two questions.

1. Is this level of black 'staining' OK and why is it only in one of the choke chambers.

2. Why, in that blackened chamber, is the butterfly scuffing the side (lighter section alongside the butterfly).




[Edited on 1/10/13 by bumpy]

[Edited on 1/10/13 by bumpy]

mark chandler - 1/10/13 at 06:45 PM

Looks normal to me

One side opens before the other hence has more air flow so gets stained more.

Rubbing, well it's hardly a quality item at the top, it's only the flaps that locate the spindle and they rub, if it works freely leave alone, want to add a couple of BHP then remove and fill the outside holes with araldite and pump the throttle when starting.

Regards Mark

bumpy - 1/10/13 at 07:04 PM

quote:
Originally posted by mark chandler
Looks normal to me

One side opens before the other hence has more air flow so gets stained more.

Rubbing, well it's hardly a quality item at the top, it's only the flaps that locate the spindle and they rub, if it works freely leave alone, want to add a couple of BHP then remove and fill the outside holes with araldite and pump the throttle when starting.

Regards Mark


if it works freely leave alone,

Now you mention it, the choke does hang on a bit after the car has warmed up. I normally jab the throttle hard to reset the choke to off.

If it is this butterfly rubbing then how to fix it?

scimjim - 1/10/13 at 07:52 PM

if that's a 38DGAS they're synchronous, not progressive like a 32/36?

bumpy - 1/10/13 at 08:06 PM

quote:
Originally posted by scimjim
if that's a 38DGAS they're synchronous, not progressive like a 32/36?


It is a 32/36.

scimjim - 1/10/13 at 08:23 PM

okay - I just refurbished a DGAS and the choke plates were rubbing, if you loosen the two screws you can move the plate slightly. If it needs any more clearance it's out with the wet & dry and/or needle files.

bumpy - 2/10/13 at 10:15 PM

quote:
Originally posted by scimjim
okay - I just refurbished a DGAS and the choke plates were rubbing, if you loosen the two screws you can move the plate slightly. If it needs any more clearance it's out with the wet & dry and/or needle files.


Did I read somewhere that those screws are captive to stop them coming undone and falling in the engine.

scimjim - 2/10/13 at 10:56 PM

I Loctite them - I've seen them peened too.