Nick, The 34 PICT-3 carb should have the throttle completely closed at warm idle. The automatic choke cam should be fully rotated down when fully warmed up. That means that the throttle lever's adjustment screw should have a tiny bit of clearance between it's tip and the choke cam's smallest step. This is proof that the throttle plate is fully closed inside the carb barrel. This brass plate has a small hole in it to meter basic idle airflow when the plate is fiully closed. The fine idle air adjustment is then controlled by the volume screw. If that's fully closed by turning it all the way in, the engine should die, due to being almost completely deprived of idle airflow. It sounds like you're engine is revved up too high at idle, due to the throttle lever screw being adjusted too far in, which is holding the throttle plate partially open. This causes the large volume screw to be almost completely ineffective, as it's being bypassed. The auto choke not fully opening proiperly, due to misadjustment, bent linkage or a bad electric choke heating element or bi-metallic spring.. The choke can may not be opening to the smallest step, artificially holding the throttle plate from fully closing upon complete warmup. This would cause the same problem and waste fuel, too. I've found many carbs (even new out-of-the-box!) misadjusted this way, due to some previous person fiddling with the screws and not knowing exactly what needs to be done to make it work properly. I've rebuilt dozens of all types of carbs, re-bushed worn throttle shafts, and test run them to check for proper operation, leaks and to adjust the basic settings, so that a customer could theoretically just bolt it on and run it as-is. AFAIK, the Pierberg should be a quality item, the Brosols being a pretty decent carb, too. You shouldn't try a Holley Bugspray, they stopped being popular many years ago for a reason. They just aren't a good carb for this application. Yes, they work on a bug engine, but not properly, according to what I've read about them. HTH, Mike B.
----- Original Message ----- From: "Nicholas Stokes" <[EMAIL PROTECTED]> To: "Air-Cooled Volkswagen Discussion List" <[email protected]> Sent: Thursday, May 24, 2007 5:45 PM Subject: Re: [vintagvw] Is There a Quality Carburetor Out There? > as a followup to my carb problem... > > My daughter brought the car to me saying that it would not idle. I > confirmed this and quickly adjusted the volume screw to let her get > home and made plans to work on it in a couple of days. > > After setting the valves and timing I was unable to bring the idle > down to about 900 rpm even with the volume screw all the way in. > This caused me to spray some carb cleaner near the throttle shaft to > confirm the vacuum leak. > > The biggest issue is that this Pierburg is advertised to be "German > Technology" and no where on the carb or packaging does it state where > it is manufactured. This in itself says a lot. It has only been in > use for about a year now and I have replaced the float and now the > wear on the shaft. If these are supposed to be better than the > Brazilian/Mexican made Brosol, it was not proven by me. > > I'm headed to Bug Out in Manassas VA this weekend. Anyone have a > recommendation for a decent replacement? > > This is a daily driver with a stock 1600 and SVDA dizzy. Is there an > advantage to finding a Holley Bug Spray? The Webers are too pricey > for me. Any other carbs? > > I see AirCooled.net has a complete dual setup using Solex carbs but > I've always been hesitant to add the complication of two carbs. > Anyone have experience with these? > > Thanks, > > Nick > On 3 May, 2007, at 20:58, Nicholas Stokes wrote: > >> Is there a decent 34 PICT-3 carb available out there? >> >> I purchased a new Pierburg hoping that it along with my SVDA >> distributor with a CompuFire ignition would keep my daughter's '74 >> Standard happy for quite some time. >> >> Well... the distributor from AirCooled.net works great and gives the >> smooth acceleration and performance I had hoped for but the carb has >> not lived up to expectations. The first problem at about six months >> was flooding out which was diagnosed to be a split float full of fuel >> which I replaced with one out of a 30-year old one in the parts bin. >> Now, a few months later, there are signs that it is leaking around >> the shaft. >> >> Any recommendations out there? I'm not looking for any extra >> performance, just something reliable. All though an extra boost >> would be acceptable as long as it works properly with the SVDA dizzy. >> >> Thanks, >> >> Nick >> VintagVW > http://homepage.mac.com/stokester/VintageVW/ >> Dub~Tunes > http://homepage.mac.com/stokester/dub_tunes >> >> >> >> _______________________________________________ >> vintagvw site list >> [email protected] >> http://lists.sjsu.edu/mailman/listinfo/vintagvw > > _______________________________________________ > vintagvw site list > [email protected] > http://lists.sjsu.edu/mailman/listinfo/vintagvw _______________________________________________ vintagvw site list [email protected] http://lists.sjsu.edu/mailman/listinfo/vintagvw
