It was 2 little vacuum hoses, like 3 mm I think that was the only thing wrong with this 2.1. It is still not brand new smooth, but idles very nice. I like locating vacuum leaks with a 3 foot long hose stuck in my ear better than spaying flamables on the engine, works for me. The exaust is slightly loud, I am guessing there is a crack or small rust hole somewhere causing the slightly off sound to the idle, but it is solid with a tach/dwell meter hooked up to it. Overall this thing runs awesome, and it only took about 1/2 hour to find the hoses and replace them with some scap hose I had laying around. I have enough confidence in it now, factory fuel injection is staying on. I drove on a 2 hour trip last week, and put on 250 miles going to work, averaging 18miles per gallon, Syncros are rated at 15mpg I trust it enough I finally took my rusted out tetenus shot waiting to happen 82 dodge truck to the junk yard. I am VW only now! And i have a job again, now I can start working on my 2789cc water to air conversion again, and don't have to sell my looker
hmm... just a thought, please enlighten me in this matter. Whats the point in runnnig a big 44mm or massive 48mm carb with 32 or 36mm venturis?
If you need that kind of venturis to provide enough air speed for the carbs to do their work, is it not better to run smaller carbs?
I'm a noobie when it comes to this so it's just a thought....
I suspect there is some relationship between venturi and throttle plate size. This would show up on the transition circuit (rate of progression) or possibly even the idle circuit. I don't think WOT would be an issue, just getting there.
Yeah some may call it overkill, but you can't have too much overkill.
In Hallmeter the mixture appears consistently poor, and when it suddenly accelerates the engine failure ... Gradually accelerate if it is normal.
The operation in the range 900RPM the 2000RPM is disastrous, after 2000RPM is satisfactory.
I am thinking seriously testing Venturis 30mm, the freedom?
Only can guess on a GM/6...
Doggy response can be from either rich, or lean, or ignition related.
Are you using a single IDF or 3?
Is your ignition advance working, and does tweaking it up help? Using vacuum advance?
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
Engine: GM250 4.1
Use only a Weber 44 IDF
Rate compression: 14:1
Simple Ignition and coil Mallory.
And the point of ignition is not advanced.
All standard.
I believe that the venturi is great, because when a sudden acceleration is occurring faults, but gradually is normal.
I suspect that the large inflow of air due to sudden acceleration in the venturi large (36mm).
Does venturis with 30mm correct this flaw?
Using these 30mm, the engine can lose power in the range from high rotation?
I'd increase the accel pump shot first, volume first, then increase accel jet size.(separately adjustable)
2x 36mm vents isn't really that much for a 250CI 6.
Do you have a wideband, and what are you running for fuel???
(14:1 CR?) E85? Or just a long cam?
Since this isn't VW related, PM or email me would probably be best. (unless everyone else is OK with it)
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
I already tried that! But the holes in the fast acceleration still ...
The big problem is, if I increase the amount of fuel at low (700-2000)RPM in the high (2000-5000)RPM he is tired in the rise of spin, where the high RPM increase it is failing in low RPM ... so I am trying to find a middle way.
I do not know if there is something in common between the venturis and Cam that I use, is a street performance 268ºx268º, so I am betting on a venturi smaller.
Doggy performance is just as likely to be from too much fuel as too little. Really lean usually results in popping out the carb etc.
If it's just a slug, take fuel out.
Easy to tell with practice, but a WBO2 removes most doubt.
Even a NB setup will tell you rich or lean.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
I trust it enough I finally took my rusted out tetenus shot waiting to happen 82 dodge truck to the junk yard. I am VW only now! And i have a job again, now I can start working on my 2789cc water to air conversion again, and don't have to sell my looker 
