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Weber acceleration problem....

To: mgs@Autox.Team.Net
Subject: Weber acceleration problem....
From: Richard.C.Guynn@mcdermott.com
Date: Mon, 9 Nov 1998 9:13:00 -0600
     Okay, I finally got the ignition system working properly, and now I 
     have a problem with the carb.  
     
     Background:
     The carb is a Weber 32/36 DGAV installed on an 18V series MGB engine.
     
     This carb is the same one that was on the engine when it was laid up a 
     couple of years ago.  It ran fine prior to that.  I have not changed 
     anything on it.  The only thing I have done is to rebuild and clean 
     it.  So it should not be a jet sizing problem.
     
     The Problem:
     
     I don't actually have it on the road yet, so all of this is coming 
     from playing with the engine sitting in the garage.  I also let the 
     engine get warm to test all of this out.  The problem is that the 
     engine spits and sputters when the throttle is opened suddenly (sudden 
     acceleration).  If I mostly close the choke plate and  hit the 
     throttle, it seems to work just fine.  So I think it is a fuel 
     starvation problem.  
     
     What I do know:
     1. The car idles fine.
     
     2. The car revs smoothly to high RPMs if taken slowly.
     
     3. Acceleration seems to work fine if the choke plates are mostly 
     closed.
     
     4. The accelerator pump appears to spraying fuel into the carb (I can 
     hear and see it).  Whether it is the proper amount, I don't know.
     
     5.  I plugged a vacuum gauge into the manifold, and got a pretty 
     steady number at around 20, so I figure that there is not a vacuum 
     leak in the intake system.
     
     6. The timing appears to be properly set (per manual instructions).
     
     What am I missing?
     
     Thanks,
     Rick

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