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Car Forum / Antique and Collectibles / Studebaker / September 2006Yet another carb question
Anybody tried a vacuum secondary 4bbl on a Stude? What were the results?  SignatureRemove the studebaker to email. The only label that fits: http://www.capitolhillblue.com/artman/publish/article_6966.shtml "Patriotism means to stand by the country. It does not mean to stand by the president or any other public official save exactly to the degree in which he himself stands by the country. It is patriotic to support him insofar as he efficiently serves the country. It is unpatriotic not to oppose him to the exact extent that by inefficiency or otherwise he fails in his duty to stand by the country." - President Theodore Roosevelt, 1908 1953 Starlight Coupe 1954 Starlight Coupe R1/4-speed 1958 Silver Hawk 1960 Frua Italia Larks (2 - they're here!) 1962 Lark VI 1962 Lark Convertible 1963 Avanti R2 R4324 1963 Lark Cruiser (R2 3/4 clone in progress) 1963 GT Hawk 1963 Daytona Wagonaire 1964 Cruiser (Survivor) 1954 3R11 1956 2E7 2004 Porsche Carrera 4S 2000 Ducati 748 2002 Jeep Overland http://homepage.mac.com/pdrnec/PhotoAlbum81.html > Anybody tried a vacuum secondary 4bbl on a Stude? What were the results? Well, an AFB is pretty much a vacuum secondary carb... nate Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel Oh yeah - so I found this 390 CFM Holley, thought I'd try it out on the cruiser, according to the CFM calculator that's just about what it wants. >> Anybody tried a vacuum secondary 4bbl on a Stude? What were the results? > > Well, an AFB is pretty much a vacuum secondary carb... > > nate SignatureRemove the studebaker to email. The only label that fits: http://www.capitolhillblue.com/artman/publish/article_6966.shtml "Patriotism means to stand by the country. It does not mean to stand by the president or any other public official save exactly to the degree in which he himself stands by the country. It is patriotic to support him insofar as he efficiently serves the country. It is unpatriotic not to oppose him to the exact extent that by inefficiency or otherwise he fails in his duty to stand by the country." - President Theodore Roosevelt, 1908 1953 Starlight Coupe 1954 Starlight Coupe R1/4-speed 1958 Silver Hawk 1960 Frua Italia Larks (2 - they're here!) 1962 Lark VI 1962 Lark Convertible 1963 Avanti R2 R4324 1963 Lark Cruiser (R2 3/4 clone in progress) 1963 GT Hawk 1963 Daytona Wagonaire 1964 Cruiser (Survivor) 1954 3R11 1956 2E7 2004 Porsche Carrera 4S 2000 Ducati 748 2002 Jeep Overland http://homepage.mac.com/pdrnec/PhotoAlbum81.html In the truest sense the AFB/Edelbrock is a mechanical secondary carb with an air valve that reacts to air flow over it. The secondaries have a linkage connection that will open them with the car off or on. The Holley vacuum secondary carbs have no mechanical connection from the primary to the secondary to open them only to pull them closed. With the engine off and you're foot to the floor the secondaries will stay shut. A vacuum secondary carb works well with heavy cars that have high ( low numerical ) axle ratios preventing them from bogging while the mass gets moving. Either carb will perform well if set up properly. The Holley needs to have its secondaries tuned to the engine using different rate springs to ensure that the secondaries are opening at the best rate for performance. With the AFB you know the secondaries are opening if your linkage is adjusted properly and you can check them with the engine off. The Holley requires a lot more experimentation, on the road. Ernie R > Oh yeah - so I found this 390 CFM Holley, thought I'd try it out on the > cruiser, according to the CFM calculator that's just about what it wants. [quoted text clipped - 37 lines] > 2002 Jeep Overland > http://homepage.mac.com/pdrnec/PhotoAlbum81.html The edelbrock AVS looked slick, but alas no 500cfm. It has the adjustable vacuum secondaries. I have not tryed it, so no report. Sure looked like a quadrajet to me though. Ross. > In the truest sense the AFB/Edelbrock is a mechanical secondary carb > with an air valve that reacts to air flow over it. The secondaries [quoted text clipped - 57 lines] > > 2002 Jeep Overland > > http://homepage.mac.com/pdrnec/PhotoAlbum81.html The AVS has an adjustable air valve, but the secondary throttle blades are still mechanical. The QJets air valve is vacuum but not as adjustable as the AVS. Look down the throat of a Holley and you see the secondary blades. Look down most AFB's, Edelbrocks, the AVS and QJet and you see an air valve covering the secondary bores. I don't knbow much about the Demons and other exotic HP carbs but out of the common group I think the Holley is the only true vacuum secondary carb. Their "Double Pumpers" are mechanical and use a second "squirter" system to ease the transition to wide open secondaries. Ernie R > The edelbrock AVS looked slick, but alas no 500cfm. It has the > adjustable vacuum secondaries. I have not tryed it, so no report. Sure [quoted text clipped - 61 lines] > > > 2002 Jeep Overland > > > http://homepage.mac.com/pdrnec/PhotoAlbum81.html There is a 500 CFM version now, although it's tuned for dual quad use, to use it as a single you'd probably need to rejet it. nate > The edelbrock AVS looked slick, but alas no 500cfm. It has the > adjustable vacuum secondaries. I have not tryed it, so no report. Sure [quoted text clipped - 62 lines] >>>2002 Jeep Overland >>>http://homepage.mac.com/pdrnec/PhotoAlbum81.html Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel Ernie, The Edelbrock/Carter is NOT a mechanical secondary in "its truest sense" !!! Not even close. If that were true...when the throttle is depressed to the floor..you would be able to see the manifold floor....correct? Sumthin tells me you kan't see the manifold floor! Sure...if you remove the upper air door...."then" you have a full mechanical carburetor...but then it isn't calibrated to work that way........! You want true mechaincal...Holley make'sem, Barry Grant makes'em, you might even call the Preditor....though there is no real secondary butterflys. Mike > Anybody tried a vacuum secondary 4bbl on a Stude? What were the results? That's how the Holleys / Carters / Ededbrocks work. The Holley takes the signal from a small hole just above (below...I've forgotten!) the ventury. The Holley controls the "amount" of open and "when" with a spring. Easy to adjust. The Carter/Edelbrock gets the signal from the center of the air stream. The Carter/Edelbrock controls the "amount" of open and "when" with a counter weight. Easy to remove weight, hard to add weight. Both methods work equally well. Mike |
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