Quadrajet vs thermoquad specs. 073 . In theory, you cannot over carb them, which is why Chrysler was able to use them on 318's. - Thermo-Quad - Rochester Quadrajet = Modification of Subsystems = References = Acknowledgements ----- Introduction ----- The Carter Thermo-Quad is a four-barrel carburetor with a spreadbore throttle bore configuration. Get parts here: https://www. I will be buying me on of the above jetted for the 318. Carter still thought it could work, and during 1967 did lots of R & D on the primary circuit, utilizing the 3 step step-up rods and some differences in the primary venturi cluster (remember the Clean Air Act of 1966, to take effect with the 1968 model year Aug 2, 2019 · The Carter thermoquad may be unique in carburetor design in that it is the only carb that was originally designed as a race only carb, and then because of its success, detuned for street/O. They came in 750 and 800 cfm ratings and when it comes to a street bound vehicle, deliver superior response and fuel economy over others. The Thermo-Quad has several controls and adjustments on the air valve which can be valuable tools for getting extra out of the carburetor. The Tquad is called "950" (by me) for lack of any better label. Jul 16, 2019 · Search titles only By: Search Advanced search… The TQ is a sophisticated carburetor that uses some of the same design concepts as the Rochester Quadrajet, including a secondary air valve/variable area secondary venturi that allows the same basic carb size to be used on a range of engine sizes. Which one do you favor and why? Plastic body seems kinda sketchy. Apr 4, 2024 · Does anyone know the differences between the Carter ThermoQuad and the Rochester QuadraJet? Thanks. Chevrolet used it one year, but then dropped the AVS in favor of the Rochester Quadrajet. 045 Secondary jets: Apr 2, 2013 · Given the generally terrible factory specs and drivability of those "smog" engines, and all of those extra gadgets on the carb, it was enough to turn most gear heads away from the mighty ThermoQuad. use. carburetor-parts. A detailed discussion of the characteristics of the Thermoquad carburetor is here. Some of the notable vehicles equipped with Thermoquad carburetors include: a. This month, we consider the Carter four-barrel carburetor offerings. It has a ton of adjustments that can be made, some one not knowing what they are doing,can get it way out of kilter easily. The Carter TQ, a spread-bore four-barrel, was announced in 1969 (and I realize this is later than the focus of many who frequent these forums). Jan 14, 2020 #2 Apr 4, 2024 · The Thermoquad is a great carb, but what makes it great, is also what makes it bad for some folks. We also touched on Holley conversions in HMM#42, March 2007. But i favor the thermoquad for simplicity. Dodge Charger R/T: The Thermoquad graced the engine bay of the formidable Dodge Charger R/T, contributing to its reputation as a high-performance muscle car. But still a good carb. First, and most important, is the tension spring acting on the air valve to keep it closed when engine demands are not great enough to use the secondaries (just like the Quadrajet). Jan 13, 2020 · At present I do have some quadrajet's on the shelf, but have always been interested in playing with a Thermoquad, so I am open to exploring based upon other's experiences. either way, the 1406 is a 600 CFM, and still a good choice for a small block. cant remember the name. Most people hate or don't like them because they don't know how to tune them. Oct 10, 2016 · This design is not unique to the Quadrajet. I favor the quadrajet due to the all metal body. com/thermoquad-carburetor-partsGet Thermoqu The cry of “Thermoquad!” became famous in Roadkill episode 23, the one where the guys build the General Mayhem ’68 Dodge Charger using a 440 engine from a mo Jul 24, 2012 · Because the Rochester Quadrajet replaced the Thermo-Quad in 1985, 1941 ( still need to find the specs for these rods ) FOUND: . It is a revolutionary technology that uses two jets to atomize the air entering the carburetor and therefore increases fuel efficiency. See full list on drivefacto. never gave me an issue the short time i had it. Dec 13, 2019 · Some might argue this as well, but a thermo quad just doesn't compare to a q-jet in terms of drivability and performance. Carter did it with the Thermo Quad and AVS. We can't do any sort of carburetor video without someone bringing up the legendary Q-jet. The Quadrajet carburetor is a very similar technology, but it uses four jets to atomize the air entering the carburetor and therefore increases fuel efficiency. This makes Thermoquad Jan 30, 2014 · i have read the q-jet is extremely reliable once tuned properly and also a good carb to use for 4 wheeling. Post Jan 29, 2021 #1 2021-01-29T15:06+00:00. Jul 10, 2005 · Because the Rochester Quadrajet replaced the Thermo-Quad in 1985, 1980, 1982, 1984 - Carter Strip Kit Specifications & Insttrructions, # 3270, 1-73, . The Carter Thermo-Quad is a four-barrel carburetor with a spread bore throttle bore configuration. The Thermo-Quad consists of three main sub-assemblies; Oct 20, 2023 · The Carter Thermoquad carburetor found its way into many legendary American muscle cars of the era. Jan 30, 2014 · Let the battle begin! I'v heard many opinions both good and bad about both carbs. Jan 13, 2020 · QJ has easier parts availability and "tuning" parts (jets, metering rods, metering rod pistons, etc) are easy to come by and it's a lot less complicated a carb. The true "secret" to proper operation of either the tq or a quadrajet is a correctly-operating "choke pulloff" (either one or two depending upon model variations). The Thermo-Quad consists of three main sub-assemblies; This video describes the Thermoquad, TQ and what all of the parts do. i had a q-jet on my old 318. com Feb 4, 2021 · To recap and clarify, used a 950 Holley Ultra HP 0-80805, an Everyday Performance prepped Stage 2 800 cfm Qjet and a "950" Thermoquad, modified by Steve Stills and final tuned by me. Here's our thoughts on the carb, it's good and bad points, and how i Jun 8, 2022 · Thermoquad is a very successful innovation in the automotive industry. b. All employ air valve transition into the secondaries. Here's how the airdoor actually works. moodysj33. E. Throughout the years, Carter built several types of four-barrel carburetors used with larger-displacement and higher-horsepower engines. Jan 29, 2021 · Dyno test results - Holley vs Thermoquad vs Quadrajet . It was designed as an emissions capable carburetor that retained or surpassed secondary throttle performance of Feb 20, 2015 · The Thermoquad, or the Edlebrock, both use a velocity valve over the secondaries, which only opens as much as the engine demands. It's a really simple mechanical device, but yet somehow people remain mystified by its basic functions. Ford did it via the 4300/4300D/4350 carburetors. Jan 25, 2021 · Carter Thermoquad, 4 barrel carburetor specifications, including float level, pump, cfm, fast idle, unloader & vapor vent. The TQ works excellent when it's set up properly, but it has 21 external adjustments which all need to be precise and done in order. It was designed as an emissions capable carburetor that retained or surpassed secondary throttle performance of earlier Carter carburetors, while delivering superior primary fuel economy. Even to this day, the ThermoQuad remains one of the most misunderstood and even feared carburetors ever produced. This excellent Jan 28, 2022 · Jacob and I show the advantages to both carbs and chose a winner in a head to head match up. Jan 28, 2021 · Anyway, tested 3 different carburetors; A 950 Holley Ultra HP 0-80805, an Everyday Performance prepped Stage 2 800 cfm Qjet and a "950" Thermoquad, modified by Steve Stills and final tuned by me. Some of… Dec 9, 2019 · The Thermoquad is one of the best carbs in my book. The quadrajet is more forgiving in that respect, but in general is not as tunable. The warpage problem does happen once in a while-I've had one warp in the 44 years that I've been using them! The Carter Thermo-Quad is a four-barrel carburetor with a spread bore throttle bore configuration. what i've read is people saying it works almost as good as the truck avenger and better than whatever 4wd carb that edelbrock came out with. Sep 23, 2018 · Back in HMM#38, our November 2006 issue, we discussed converting your muscle car to a Rochester Quadrajet carburetor. 061 . Jan 18, 2009 · A rochester quadrajet carb was GM's answer to this same designbut a quadrajet was never oem for any ihc application so we aren't interested in including those in this discussion. 9 3. sgsbzz rjgnl rudxx iybss kbuar nvehxw trozz odrgf bvdsgd maxbs