Drag Racing 1/4 Mile times 0-60 Dyno Fast Cars Muscle Cars

How to de-bog your Quadrajet part 2

The Rochester Quadrajet has gotten a bad rap over the years, but it's actually an excellent carburetor once you understand how they work. Often referred to as "Quadrabog" or "Quadrajunk", many of the issues these units suffer stem from neglect, or "modifications" that do more harm than good. Being a spreadbore, air-valve secondary design, the Quadrajet is capable of flowing 750 or 800 cfm of airflow, eliminating the need to buy different carburetors when your set-up changes. In addition, the small primaries make for great drivability and fuel economy. In this clip, I'll discuss theory of operation on the secondary side, since that's where most problems arise. So, leave your preconceived notions at the door and let's see what makes these carburetors tick.


 


More Videos...


How to debog your Quadrajet part 3
In the first two videos we looked at operational theory of the Quadrajet. In this episode we'll explore a couple mistakes the home mechanic often makes in an effort to improve the performance of this unit.





How to de-bog your Quadrajet part 1
Sorry guys, I got the videos a bit out of order. The Rochester Quadrajet has gotten a bad rap over the years, often called a Quadrabog or Quadrajunk. In fact, this is a great multipurpose carbureter once you understand how they work and what not to do to them. In this clip I introduce you to the Quadrajet and begin explaining the theory of operation of these units. Enjoy!





re-jet your Quadrajet (part 1)
rejetting a quadrajet





Identifying Quadrajet vacuum ports
I always see a lot of questions about what various vacuum ports do on a Quadrajet. Here's a general guide that will point you in the right direction. Remember that there were many different Qjets over the years and vacuum port locations and number will vary. This video is representative of 1975-90 carbs. Enjoy!





Everything you wanted to know about automatic chokes but were afraid to ask
I've noticed many people drive vehicles with inoperative chokes. Even though chokes can be intimidating, repairing and adjusting them actually is very simple. So, stop pumping that accelerator and follow along as we look at how chokes work and how to repair them.





How to adjust Quadrajet secondary air doors
These take some trial and error to get them adjusted so that there is no bog, but it's not hard to do-here's how.





how to minimize engine bog with a Quadrajet carb
this is to minimize engine bog when the pedal is to the metal. do not over tighten, very small spring...you want to try 1/4 turns or 1/2...q-jets are good if tuned properly. also when you are tightening screw it will have tension on it so keep the screwdriver firm. 1986 gmc sierra single straightpipe to cherrybomb. you will need a small flathead screwdriver and a 3/32 allen key. be sure not to tighten to much or else your vacuum secondary flaps wont open.





Quadrajet air leak fix and warped air horn repair tutorial.
How to identify a Quadrajet with a warped air horn without diss assembly or running it on a car. These tips would have saved me time and money which is why I made this video. I also discus how to repair a warped air horn and prevent your air horn from warping in the first place. If you have a whistling noise just off idle then you got some work to do. You will never get your engine tuned right, your cold start performing or decent fuel economy unless your four barrel carburetor is just right. Special thanks to Cliff Ruggles for his book Rochester Quadrajet carburetors and to my brother Adrian who spent hours on tuning and fitting. See this video for description of the technique I used to straighten a warped air horn. http://www.youtube.com/watch?v=l_SgQiVf3_0&feature=youtu.be here is a technique for re-bushing the throttle shaft without drilling. http://rmcavoy.freeshell.org/Q_Jet_bushings.html





The Infamous Quadrajet Moan
Making a full-throttle pull on the chassis Dyno with our 1972 Pontiac Trans Am with 455 H.O. engine.





re-jet your Quadrajet (part 2)
rejetting a Quadrajet





How to Adjust the Secondary Air Flap on an Edelbrock Carburetor
Family owned and operated for over 40 years with over 75,000 satisfied customers. Rated #1 Click on blue link http://www.enginefactory.com/letters.htm How to Adjust the Secondary Air Flap on an Edelbrock Carburetor Produced by enginefactory.com Worlds leader in turn key muscle car engines.





Idle Mixture Adjustment on 4 Barrel and 2 Barrel Carburetors
Setting Idle Mixture and Idle Speed on Carburetors with Idle Mixture Screws to Pass the Smog or Emissions Test with a Tachometer





quadrajet-cam
See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8. We removed the hood, mounted a camera looking down on the air horn, and took it for a spin, running wide open on an uphill grade. See how the secondary air valve responds to rpm drop at each upshift of the THM. Also included is a smoking burnout.





750 vs. 800cfm Rochester Quadrajets-how to tell them apart
There exists a ton of misinformation regarding the actual airflow capacity of the Rochester Quadrajet. Not many people know how many variations there are or how to tell them apart. Here is a simple video explaining how to identify each size based on casting design. I will cover the "cfm-limited" carbs in a separate video.





Rochester QuadraJet M4ML
Quadrajet that i tweaked on a HDT VH Commodore - fast acting secondaries.




Which car is faster? Which Car is Faster?





Similar 1/4 mile timeslips to browse:

1982 Datsun 280 ZX : 10.256 @ 124.300
Grant, Engine: 2.8L, Supercharger: n Turbos: n


2005 Dodge RAM SRT10 Quad Cab Supercharged: 10.733 @ 125.100
Mike Brady, Engine: 8.3 L, Supercharger: Paxton


2004 Dodge RAM SRT10 : 11.049 @ 122.420
Justin Shelton, Engine: 8.3L V10, Tires: 28x14.5x16 Hoosier


1976 Datsun 280 ZX : 11.151 @ 111.670
Ed Gawrych, Engine: 355 SBC, Supercharger: - Turbos: - Tires: BFG 26.5-8 Drag Slicks


1975 Datsun 280 ZX 280Z: 11.523 @ 127.410
EJV, Engine: 6.8L stroked LS3 V-8, Supercharger: n/a Turbos: n/a Tires: 195/75-14 fr, 235/60R-15 MT ET Streets rr


2005 Dodge RAM SRT10 quad cab: 11.760 @ 113.440
rick padilla, Engine: 8.3, Tires: M&H slicks


2005 Dodge RAM SRT10 zex nitrous: 12.050 @ 114.700
Mike Kuriger,


2004 Dodge RAM SRT10 Paxton Supercharger: 12.110 @ 117.128
Todd Smith, Supercharger: Paxton Tires: M&H 390's


2004 Dodge RAM SRT10 : 12.390 @ 114.000
Christopher Anderson, Engine: viper v-10,


2005 Dodge RAM SRT10 QUAD CAB: 12.497 @ 110.620
Mitch Wolfe, Engine: V10, Tires: M@H drag radial


1981 Datsun 280 ZX Turbo: 12.600 @ 106.000
Gerry & Pat, Engine: L28ET, Turbos: T3/T4 hybrid Tires: M/T ET Drag


2005 Dodge RAM SRT10 : 12.771 @ 109.670
Brent Greener, Engine: V10 Viper, Tires: Stock


2005 Dodge RAM SRT10 : 12.837 @ 105.780
Ron West, Engine: 8.3,


2005 Dodge RAM SRT10 : 12.870 @ 108.800
Robert Buckly, Engine: 8.3 VIPER V10,


2005 Dodge RAM SRT10 : 13.000 @ 107.530
Joel Misasi,


2005 Morgan Aero 8 : 13.012 @ 108.810
NA,


2005 Dodge RAM SRT10 Ram SRT-10 Quad Cab: 13.050 @ 106.280
Kauka, Engine: Viper 8.3L 505 ci, Supercharger: None Turbos: None Tires: M/H drag radials


2004 Dodge RAM SRT10 RC: 13.232 @ 105.360
Wade Smithers, Engine: Viper V-10, Tires: STOCK


2005 Dodge RAM SRT10 Tuned: 13.320 @ 104.290
Venomous,


2004 Dodge RAM SRT10 : 13.358 @ 101.840
charles, Engine: viper v-10, Supercharger: none Turbos: none


 


©2014 DragTimes - Disclaimer