OK almighty all knowing dodge folks. Honda guy out with thermoquad 101. Dodge w150 I think so. Mopar Magazines Index ofUseful Tech Articles Brought to you by the 6171Dodge Truck Website http Last Revised 122298. Performance Upgrades for the Chrysler, Dodge, and Plymouth 318, 273, and 360 engines. Keith Indy. See Rick Ehrenbergs bolton performance tips. Bill Rolik Enterprises carries NOS, reproduction, and replacement parts for Chrysler, Plymouth and Dodge vehicles built during the musclecar era between 19. PRODUCT INDEX. MOROSO PRODUCT INDEX. F CONT Fittings, WeldOn AN Bungs Fittings, WeldOn NPT Bungs Flashlights, Magnifying Flat Bottom Air Cleaners Floor Pan. Find or Sell any Parts for Your Vehicle in USA. Parts for Sale Add New Used Part Blog Contact Us Add New Used Part. Olds FAQ Carburetors. Theory. At the risk of atomizing a little more fuel onto the fire a little carb humor. Air flows through the. G. B. Venturi 1. This accelerated airflow causes a pressure drop, which in turn. Small venturies are by nature more responsive to small changes in. Unfortunately. a small venturi also poses a limit on the total airflow through the passageway. Thermoquad/Pic01.jpg' alt='Thermoquad Air Valve Tool' title='Thermoquad Air Valve Tool' />The traditional carb Holley 4. GC, et al has a single booster venturi. The Q jet actually has multiple nested booster. This, IMHO, is the secret to the greater sensitivity of this carb in. Naturally, this additional restriction also compromises. Holley carbs which are clearly designed for W. O. T. only dont even. Now, the secondary side of the Q jet is clearly designed for W. O. T. only. Not. only are there no booster venturies, there isnt a venturi at all just a. The secret is the air valve. Ill go. out on a limb here seeing as how I usually never have strong opinions Holley carbs clearly have better. GC, AFB, AVS, and T Quad carbs also provides more. Again, the ultimate goal here is to maintain a. This is true. However, the vacuum secondary Holleys dont derive their vacuum. The vacuum source is a small port that opens to the constriction in one. So, as air flow through the venturi accelerates, an ever. Find great deals on eBay for mopar air cleaner and mopar air grabber. Shop with confidence. Mopar Restoration Vendor and parts sources. Newsletter. Sign up for the all the latest and greatest updates, discounts and info. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. Venturi. So, the vacuum signal applied to the secondary diaphragm housing in a Holley is. Consequently, both air valve. Holleys respond to airflow. However, the Holleys response. Hence, I would give the air valve carbs an edge in this area. Nevertheless, dont think that vac secondary Holleys are simply responding to. They respond to VENTURI vacuum, which changes with. Of course, all of this is rendered moot by EFI systems. Electronics much as I. This, more than anything else, is the reason for the incredibly. All the systems in nearly all downdraft carburetors, whether 1 bbls. Gs. Q Jets, Holley, Carters, etc., utilize an up and over system that. I am simplifying quite a bit here, but suffice it to say. UP through a well either idle, main, or secondary. As it. travels through the well it is emulsified with air. Once it reaches the top. For the idle mixture, it travels back down the idle channel to the idle. For main system and secondary fuel it doesnt make an. Secondary fuel likewise, exits the secondary. The point is, you could take the jets OUT of the carb and. To see for yourself, the next time you have a Q Jet apart, gut the main. You. will have no leaks, unless some plugs are bad or something. Another thing to consider. Kitty Party Games On Colours there. The metering rods do not seat in the jet. When. it is not running, the rods are up, in their richest position, not seated. When the engine is running at an idle, engine vacuum pulls the rods to their. Even. secondary rods do not seat in the jet. The secondary orifice in a Q Jet is a stainless steel disc with a. Other brands use a material of the same type as the primary jets. But. Q jet is the only one with secondary metering rods. Thanks to Joe Padavano, Thomas Smith. Calculating Flow CFM Sizing. Its easy to overestimate the CFM requirements of an engine. You can. calculate the cfm your engine flows using the formula everyone on this. CFM engine CID x max rpm x volumetric efficiency3. Now for a stock 4. Ill assume you wont go above 5. So your engine. needs only 6. Here is where the universal misunderstanding begins. Usually people. ignore the formula above, or use a rule of thumb like use 1. The fact is that 4 bbl. If you use a 6. 00cfm carb on your 4. Since atmospheric pressure is about 3. If your engine makes 3. Everywhere else in. Unless the car is a drag race only car, the 5 power drop at max rpm. How many at WOT How many at WOT and 5. So Id say pick any carb that flows at least 6. I believe all. the true 4 bbl Quadrajets do, tune it to match your car and driving. On the other hand, bolt on a. Dominator, and youll probably be miserable with the result. You probably know that the airflow through a carburetor is. Since 31. 5 2, and sqrt2 1. Heres a neat one. I used a 6. 00 vac secondary on my 1. NON roller. cammed 5. I worked on the 7. VERY RESPONSIVE off the bottom endMakes a difference with. HOWEVER, theres a trade off with this. Top end was off. considerably with the smaller carb on the big engine instant. Sometimes, you can just go TOO small. This is where I say the Q jet when properly calibrated, or even Holleys. Of course, once. repairs were made to the 7. Very simply, the problem with using a big carb on a smaller motor. Sure, itll run, but you dont NEED it, and youre gonna waste. The major concern with the intake system is velocity. If you. can keep the velocity up, the more responsive it is. Smaller. portsvalves, carbs make this possible. Again, this is simplified. Intake runner size, port size, cam liftduration and valve size have a. Justin Timberlake 20 20 Experience 2 Download Zip. LOT to do with it. You can go huge with everything, but lose on the. The best running engines have MATCHED components working. Bigger isnt necessarily. Ive personally had strong running. Chevelle 3. 27s make me look bad in my stock 6. W 3. 0 4. 00. years ago. About the. only time bigger is better IMO, is fuel line size. Ultimately, the way to build power is to move more air. Since the inlet side is. Of course, small. This is the reason. A set of. small diameter, long runners is used for part throttle driving, with a set. W. O. T. Anybody remember the old Offy Dual Port manifoldsThese had two sets of. Ive read an article not to long ago in Hot Rodding if I remember right. They were comparing the 6. They got the most horse power and torque out of the. They pretty much said the formula isnt quite always true but is a. GM recommends the 7. Holley carb on their 3. ZZ. create engines. My ZZ4 just absolutely rips with the 3. Holley. A. magazine back in 9. ZZZ create engine with a 7. Edelbrock quad setup using 2 6. The. horsepower and torque increased. Thats 1. 20. 0cfm It was only reved to. It mainly depends on the setup. Big roller cams really like the. I had a 3. 50 Olds built to the Edelbrock RPM specs in my HO for 3 years. I. ran a 3. 31. 0 7. Holley and it was very. The 6. 00 cfm. will give you better gas mileage. The engine package is totally streetable. Edelbrock recommends a 7. Olds RPM package. Thanks to John Carri, Mike Rothe, Joe Padavano, Chad Schwartz. All the talk about Holleys and Q Jets prompted me to do a little. What I found is, I think, rather interesting in a trivial. Not really significant when it comes to selecting. Now, while I maintain my assertion that I like and use. Q Jets, lets just say Im just doing a little bit of sacred cow. Things for which the Q Jet is revered. Being a four barrel carburetor. Actually, the worlds first progressive four barrel down draft carb was. Carter WCFB Will Carter Four Barrel, introduced in 1. Weighing. in at a hefty 1. Buick Straight Eights. They. are still available on E Bay, from time to time. The secondary air valve. Used by Carter on the AFB in 1. Q jet. The secondary air valve was taken to its next level of development in. Carter AVS. However, I dont know if the AVS or the Q Jet was. Primary Metering Rods. Again, used in the Carter AFB way back in 5. In fact, the AFB and AVS. Q Jets. utilization of a single power piston. Triple Venturi. As near as I can tell, the Q Jet was probably the first with this. However, in the late 6. Dual. Jet. Holley made a two barrel with triple venturis the 2. Another. version, introduced in the early 7. Rochester 2. GC. Secondary Metering Rods. Moroso ISSU Catalog by Moroso Performance Products. Published on Jan 1.