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Big hesistation but only on both barrels
https://slantsix.org/forum/viewtopic.php?t=15261		 Page 1 of 1
Author:  ZacharyB [ Sun Dec 04, 2005 1:11 pm ]
Post subject:  Big hesistation but only on both barrels
I wanted to throw out my minor problem and see if I could get any replies.

I bought the 2bbl DGV Weber conversion for my car and it runs great. If I open the primary barrel alone it's perfect. If I open the secondary barrel alone, it's perfect (can only be done by hand, not while driving). If I open both of them together a la wide open throttle, WHOA :shock: huge hesitation.

When I got the Weber I didn't know it had so many adjustable properties. There are air correction jets and accelerator pump nozzles, the main jets and an idle jet for each barrel! I don't know where to start in eliminating the hesitation that appears when both barrels open. Obviously, too much air is getting into the engine. Before I go spending upwards of $5 a jet I wanted to tap into the vast experience of the Slant Six community :) (I'm unemployed)

Any thoughts will be read in earnest!
Author:  Ron Parker [ Sun Dec 04, 2005 5:00 pm ]
Post subject: 
How much modification has been done to the engine. Thanks Ron Parker













Hey Has That Thing Got A Bagel Bamboozler In It
Author:  ZacharyB [ Mon Dec 05, 2005 12:15 am ]
Post subject: 
Just necessarily bored .040 over on a rebuild, everything else is factory because I live in metropolitan NY where the speed traps are like weeds and traffic lets you go 50 mph... if you're lucky

The only reason a weber is on there is because I cracked the stock 1920 trying to tighten it down!
Author:  zedpapa [ Mon Dec 05, 2005 11:06 am ]
Post subject:  weber
is it a progressive 2bbl? i have heard they can tricky to tune. first step is to get a book on tuning webers. i think HPBooks publishes a good one.

zedpapa
Author:  Matt Cramer [ Mon Dec 05, 2005 1:20 pm ]
Post subject: 
Sounds like an accelerator pump issue. The problem isn't too much air as much as too little fuel.
Author:  ZacharyB [ Mon Dec 05, 2005 3:35 pm ]
Post subject: 
It is progressive; the secondary is mechanical and only opens past 3/5th throttle.

Thanks for your replies. Once the huge (total loss of power) hesitation passes it gets going nicely

Just have to plan traffic merging more, not a problem since I ride a 250cc motorcycle also
Author:  CStryker [ Mon Dec 05, 2005 3:58 pm ]
Post subject: 
Hate to ask, but is this using a 2-1 barrel adapter, or a super six manifold?
Author:  ZacharyB [ Tue Dec 06, 2005 4:08 pm ]
Post subject: 
I'm using that tall small-to-wide carb adapter that usually comes with 1bbl -> 2bbl kits like these.

I might be able to phrase the problem a different way: what is the condition when you step on the throttle and the car immediately hesistates, but then gets going after half a second? This is what happens when I arrive on the second barrel. I don't think it's the main jets in the second barrel because the car keeps pulling nicely after the hesitation, all the way to speeds-not-advised

It might be the accelerator pump nozzle (there's one for each barrel, sticking out like a support beam over the barrel, that shoots fuel downward directly into the carb throat) is too small on the second barrel as Matt suggested. I was wondering if anyone else had had tuning problems with the DGV Weber conversion
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