Re: webers (the gasoline kind)

[farna@xxxxxxx]

Sounds like the secondary is opening to fast, causing a sudden drop in vacuum. Of course you probably realized that! If the secondary is mechanical then tinkering with the linkage is all you can do that I know of. That's what I've had to do with mechanical secondary 4V carbs anyway -- quite a long time ago! 

As for the vacuum -- where are you getting vacuum for the distributor from now? I know there has been some debate over ported/non-ported vac for the distributor in the past. Since you aren't getting ported vacuum, I'd suggest looking at the timing settings for an older AMC six that didn't use ported vacuum and trying those settings. Get vacuum from as near the source used on the older engine as possible. 

On June 9, 2005 Tom Jennings wrote:

> So I have this 32/36 DGEV (two-barrel progressive) Weber carb on
> my 258.  I've got the main barrel barn-door dialed in. It was off
> a Jeep so it didn't have far to go.
> 
> I bought the popular book on Webers (it's out in the car, too lazy
> to get) which frustratingly leaves me in the dark on the two items
> I need to know:
> 
> * ported vacuum?
> 
> * adjusting 2nd-venturi issues?
> 
> It appears that Webers simply don't provide ported vacuum (eg.
> vacuum signal for the distributor picked off right above the
> closed throttle plate). I've got the timing set statically to
> 5btdc, but then I stick the hose on and get 20 whatever btdc
> degrees.  Runs OK but I don't like it.
> 
> I have a huge bog when the 2nd venturi opens, plain and simple.
> Load or no load. The accellerator pump hasn't run out of stroke or
> anything when it starts to open, so I don't think that's it.  If I
> ease through the bog region it flows OK and the motor pulls like
> hell, so the jetting isn't too crazy. I assume all I can do is
> bend the linkage to determine pull-in.
> 
> 
> Does/has anyone run a Weber on a Jeep or AMC and know anything
> about these things? I'm hoping I can get through fall/winter with
> this thing until I get a TBI system together.
> 
> 
> Overall it's running really well. Idle, in gear, then quarter or
> half throttle breaks the tires loose with no effort. While the
> tires aren't exactly slicks, the axle is 2.73.
> 
> I can't make it ping at all so I have room for more advance!
> Sweet!
> 
> 
> 
> 
> 
> 
> .


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