Quadrajet secondary metering rod chart. com, others are listed for reference only.

Quadrajet secondary metering rod chart 0400 M M/S: Power tip starts at 80° air valve opening. Aug 7, 2015 · So there was no 7040270 carb in 1970 ? You would be correct. Just remove the small screw on the hanger and gently pull the rods out. Never use in performace applications using greater than 70* air valve opening. How the metering rod work. One great thing about Q-jets is that you can tune the secondary side without having to remove the lid. US manufactured and ethanol ready, Full coverage of the Rochester carbs in the catalog as well. S: Power tip starts at 90° air valve opening. 0400 S BM 7037744 0. I went right past it. The “jets” in the main body of the carburetor are fixed in size. 0300 S CB 7042335 0. 077 " Primary Jets, 52K Primary Metering Rods, " K " Secondary Hanger and CH Secondary Metering Rods. Secondary Metering Rods Rods a plenty! All Q-jet secondary rods interchange. May 15, 2017 · I found the secondary metering rod chart in Cliffs book very helpful - I have been going through my stuff lately, in part because I am thinning out my inventory of spare parts, but desire to keep a nice collection of parts for my car, for which I currently have at least two early '70' Pontiac carbs for QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. Olds was also the only one to use the triple rods. Rochester Secondary Metering Rods Code DADescription Secondary Metering Rods. They were drilled at different heights and would effect how early and how far they were lifted when the secondary air baffle opened. Rochester Quadrajet, 4-barrel Carburetor metering rods and jets. Many sizes available through the online catalog. They DID NOT put specs of a Quadrajet carb number (81-UP) in the manual. If you by chance run by an AC Delco Nov 26, 2008 · C3 Tech/Performance - Q-Jet Metering Rods/Jets sizes? - I've got a Q-Jet from a 1972 Cadillac (472ci (7. Degrees of Secondary Air Valve Opening vs. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. The primary rod is a restriction inside the jet Rochester Quadrajet, 4 barrel carburetor jet sizes. 1360" and non-removable from carburetor 40 60 70 80 90 Tip length GM Part # deg. 003" of rod's minimum diameter. Just one simple kit part number. Rochester Quadrajet secondary rod hangers allow you to tune your carburetors secondary metering by adjusting secondary rod height, altering secondary rod power tip engagement. Aug 22, 2023 · The secondary jets are all . . Since the secondary cam raises all hangers the same amount, it also controls how much of the tip is in the jet at full lift. 0400 M BH 7035916 0. Quadrajet Secondary Rod Specs Stamp|OE#|Power tip BV 7040724 0. These facts are pretty obvious. D. Think about why a 74 chevy 350 smog motor would have 77 jets, while a 70 Stage 1 Buick 455 would have 70 jets. 0400 S BB 7034335 0. . The P/N is 7044502 Jets # 75, Primary Rods 46B, Secondary Hanger K, Secondary Rods CH. Jun 23, 2022 · Rochester Quadrajet 4 barrel carburetor metering rod system. All HQ 308 manual cars and all 350 cars had jets and metering rod combinations that pushed more fuel into the engine for less power out compared to the HG 350 manual. 0303 M BY 7040856 0. 0 deg. The secondary rods have different thicknesses along their entire length. 1360" and non removable from the carburetor. As the rods get lifted out of the jet, the air fuel changes varying with the amount of jet The HT and HG 350 manual engines would seem to have provided the best combination of power AND fuel economy for Quadrajet-equipped cars. Click on the links to see the material. 0340 M DG 7048890 0. com, others are listed for reference only. Jan 15, 2021 · Rochester Quadrajet, 4 barrel jets. 070" Primary Jets, 39 Primary Metering Rods, "K" Secondary Hanger and CC Secondary Metering Rods. May 30, 2018 · The correct answer requires this data Quadrajet code numberEngine specificsaltitudeIf the carburetor is original and unmolested, then the Main Air Bleeds (MAB) play a huge role in the calibrations. QuadraJet Secondary Metering Rods I. Rochester Quadrajet Carburetor Secondary Metering Rods - Carburetor Parts & Kits for Rochester, Carter, Holley, Edelbrock, Ford Motorcraft QJet, 4G, 2G, Mercarb Marine, AFB, AVS Thermo-Quad Carburetors Jan 31, 2009 · QuadraJet carburetors have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. This listing is for 1 pair of rods. List of applications and carburetor numbers and the jet sizes associated with it. An air valve, positioned above the secondary bores, controls the fuel delivery for high demand conditions. Find your carburetor, then check the jet size it should have. Jan 30, 2012 · Cliff's Quadrajet Parts and Rebuild Kits » General Category » Quadrajet Carb Talk and Tips (Moderators: Cliff Ruggles, Ethan1) » secondary metering rod hangers « previous next » Print Pages: [1] Go Down Jan 1, 2023 · A cam on the secondary air valve raises a metering rod hanger in conjunction with the opening rate of the secondary throttle valve; the metering rod hanger in turn raises the metering rods. Click here for secondary rod chart. 0303 M DC 7047816 0. Power tip lengths determine when full enrichment occurs: ---S (Short power tip) Full enrichment occurs at 90 degrees air valve opening. Jet size does NOT equal more power. Smaller diameter power tips will richen the quadrajets fuel curve and larger power tips will lean the mixture. 2) according to my Doug Roe Quadrajet book*, on page 251 is says that the only service hanger is part number 70354522, which is the 'V' hanger. NOTED. 0320 M CF 7044775 0. In that kit, it contained the primary metering jets, primary metering rods, secondary metering rods and secondary hanger. This is the area of the rod still in the fixed jet when the air valve door is 100 percent open. DA 7046010 Jan 8, 2010 · The higher the rod is positioned by the hangar, the sooner the taper will be 'seen' by the secondary metering discs (jets). We only stock Letter code DA. Mar 29, 2016 · Q-jet secondary metering rods are tapered with three areas: a power tip, the tapered section, and the straight section at the top that occupies the jet for the first 4 degrees of air valve opening. 0340 M AX 7033549 0. Home Used Quadrajet Parts Hangers, secondary rods Hangers, secondary rods Used secondary rods and hangers. Nov 10, 2024 · Each metering rod is stamped with a two-letter code that will specify the diameter and length of the power tip. M: Power tip starts at 80* air valve opening. Secondary rod hangers are letter labeled B thru V, B being richest, V being Leanest. 7L)) #7042237 on my NOM 350. 0400 S BG 7034822 0. L: Power tip starts at 70* air valve opening. Letter code corresponding with original GM Rochester numbers listed below. We have a large selection of correctly profiled quality USA made jets, primary and secondary metering rods and hangers for use in rebuilding and tuning automotive and marine Rochester Quadrajet carburetors. Rod Diameter in Secondary Jet Rod diameter measured in ten thousandths of an inch. And will both carbs interchange with each other?? The secondary shaft is froze on the 17057204. Secondary rods are great for tuning your carburetors secondary air fuel mixture. As the secondary air valves rotate open there is a plastic cam that lifts the secondary hanger and rods. Oct 16, 2016 · Metering Rod and Jet CombosPLEASE READ: 1981-UP Quadrajets used a part number called a metering rod and jet kit part number. -Most WFOT tuning can be performed with changes to the secondary metering rods, and extreme fine tuning with secondary rod hanger changes. Code 20 deg. CODE NUMBER IS DIAMETER IN THOUSANDTHS OF AN INCH AT LEANEST POINT. The primary airflow components in the Rochester Quadrajet carburetor include the main metering jets, primary and secondary venturis, and the air bleeds. I've been reading up on how to rebuild the carb and I'm Rochester Quadrajet Carburetor Secondary Metering Rods Secondary rods are great for tuning your carburetors secondary air fuel mixture. Jun 1, 2022 · QuadraJet - Which secondary metering rod to use? Pontiac - Street QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. 005" of rod’s minimum diameter. What isn't obvious, is that different metering rods have different dimensions for their entire length, and produce The Doug Roe book on Rochesters, in the chart showing all the primary metering rods, shows the only triple taper rods ever made were rods 7040699- 48C and 7040701- 52C, and these were used on 1970 Oldsmobiles only. Files and videos of information. 1-740-397-2921 20579 Berry Road, Mount Vernon, OH 43050 By understanding the various airflow components in the Quadrajet carburetor, you can optimize its performance and ensure smooth engine operation. The 7040270 is the correct Qjet for the Ram Air IV. This secondary air valve is connected mechanically to a pair of secondary metering rods that are tapered and are suspended within a pair of fuel metering orifices. 0400 M BJ 7036077 0. Jan 2, 2015 · 17057204 & 17057213. Awesome tuning aid for secondary power and performace. Quadrajet Secondary Metering Rods Author: Unknown This is an all-inclusive chart on secondary rod ID numbers, technical specs, and GM part numbers. Data below is for informational purposes OEM Rochester Secondary Metering Rod Chart: Rods listed in BOLD are available from QuadrajetParts. I don't know a whole lot about how the engine is built but I'm assuming the carb is probably not set up right for a small block. 0300 S CC 7042356 0. 0001") Secondary Jets are all . Carb 17057204 came stock with . Jan 24, 2013 · Can anyone point me to a web site that can tell me the rod and jet sizes that were stock for my carb. These systems at times overlap in their operation. Jun 24, 2014 · This is an extremely intensive document and masterfully written with any advanced information you want to know - primaries, secondaries, tuning, and carburetor identification. « Modern Engine Controls: More than I can say or remember in 20 minutes TPI Injector Swap » Dec 3, 2011 · I'm looking for the chart I had years ago that explained the difference in the secondary rod hangers. It’s common knowledge that the secondary metering rods determine the jetting at wide-open-throttle (WOT). Nov 10, 2024 · For those who prefer to run your street engines with a Rochester Quadrajet, here are a couple of tips that can very useful. It's been rebuilt so I don't know if it's been modified. Tip considered to begin at that part of the rod that is within . 0400 S BF 7034400 0. 0400 S BK 7037295 0. Secondary metering changes are accomplished by changing the secondary metering rods. The image is a bit blurred (my camera can't always decide between the counter top or the item), but you can still see the relationship between the hole and the letter designation: "A" = rich sooner than "Z" QUADRAJET CARBURETOR PRIMARY METERING RODS GRZ 07 APR 95 PART 1 OF 2, EARLY STYLE LONG RODS NOTES: 1. deg. Jun 1, 2022 · QuadraJet - Which secondary metering rod to use? Pontiac - Street Aug 28, 2019 · This gets further complicated because: 1) The part number assigned to the 'secondary metering rod holder kit' (which contains the hanger and small screw) is just that, a kit, and not the hanger itself. The most important part of the rod is the power tip. How does the metering rods hook up? Dec 26, 2009 · The hanger height controls the fattest portion of the rod in the jet (orifice) at the initial onset of the secondaries. (. fc2 zr5 hcrhsm tt3 z9n5h omh zudh rpvswn tke pgc8q