Precision Flow Aluminium Main Body

The all new die cast aluminium main body design, which features lengthened venturi sections for greater mid-range torque is a great plus for both throttle stop and bracket racing. Heads up racers will benefit from the new raised intermediate system for a stronger signal and enhanced air entry section for better flow to the booster venturi. Available with cast throttle bores of 2.000, 2.125 & 2.250.

Annular Booster Venturi

The annular booster venturi are precision flow die cast with CNC-machined billet aluminium inserts. Far superior to the standard castings, these new venturi have a much smoother and refined air entry and exit for increased flow, a stronger vacuum signal, less turbulence and improved fuel emulsion for better combustion. Additionally, the discharge holes around the circumference of the insert are drilled, not punched. The gas version has 12+ discharge holes versus the conventional 8. Two separate booster inserts are available for either Gasoline (red), E85 (green), or Methanol (blue).

Billet Metering Block

QFX carburetors have all-new metering blocks. CNC-machined from billet aluminium, they feature 3-circuit metering (gasoline carburetors), changeable emulsion, idle feed and intermediate bowl feed and discharge. Alcohol carburetors also feature a billet metering block, dedicated for alcohol use, utilising 5/16 jets.

QFT Fuel Bowl

QFT's aluminium fuel bowl is unique, combining strength with significant weight reduction.  QFT's aluminium fuel bowls feature dual threaded fuel inlets and dual sight glass for convenient float level setting. Dedicated floats for specific applications ensure optimum carburetor performance characteristics without additional upgrade components.

All QFX series large flange carburetors have QFT's external linkage. Additional links are packaged with the carburetor providing four variations of throttle opening rates.

750CFM

1050CFM

1150CFM

1250CFM

1450CFM

Splits

750CFM

850CFM

950CFM

1000CFM

1050CFM

High-Flow Aluminium Body

The precision vacuum-drawn aluminium die casting helps to minimise any chance for porosity to occur. Also, critical casting dimensions can be held at much closer tolerances. Larger CFM sizes are die cast to exacting specifications to provide "real world" venturi/throttle bore combinations that provide both maximum airflow and throttle response. Screw-in air bleeds enable fine tuning of both the low- and high-speed systems. Scalloped, polished symmetrical throttle bore openings coupled with recessed air bleed cavities provide minimal restriction to airflow, upgraded "racing" booster venturi provide extended operating range.

Billet Metering Blocks

CNC machined to provide more precise fuel metering and a more uniform fuel performance curve. These carburetor metering blocks feature 5-stage changeable emulsion, idle feed and power valve channel restrictions. This provides the ultimate, tuneable fuel curve. Alcohol carburetors use 4-stage emulsion metering blocks.

Billet Throttle Body

QFT throttle bodies are CNC-machined to exacting tolerances and provide exceptional strength. Slabbed Teflon coated throttle shafts are assembled with Teflon ribbon bearings, low-profile button head throttle plate screws, which result in maximum airflow with minimal throttle effort. All Race Q throttle bodies feature Dual Pattern Flange allowing for use on 4150 & 4500 style intake manifolds. Race Q carburetors feature a "Quick Link" system that alters the secondary opening rate by simply changing the secondary link. 40%, 60% and 1:1 rates are available.

Die Cast Aluminium Fuel Bowls

QFT's aluminium fuel bowl is unique, combining strength with a significant weight reduction. QFT's aluminium fuel bowls feature dual threaded fuel inlets and dual sight glass for convenient float level setting. Dedicated floats for specific applications ensure optimum carburetor performance characteristics without additional upgrade components. The Race Q fuel bowl features quick change ports, allowing the user to make jet changes without removing the fuel bowl. The quick change jet driver is included with each Race Q carburetor, making a jet change easier.

Universal Features of Vacuum Secondary Carburetors

• Changeable Air Bleeds idle & high speed for ultimate tuneability
• QFT QuickSet adjustable secondary vacuum housing for ultimate tuning flexibility
• Aluminium fuel bowls w/ sight glass windows
• Billet metering blocks w/ changeable idle feed power valve channel restrictions
• 4 corner idle system
• Notched secondary floats
• Slabbed throttle shafts w/ Teflon bearing ribbons w/ stainless steel plates
• Billet aluminium throttle body
• Down-leg boosters

Universal Features of Mechanical Secondary Carburetors

• Changeable air bleeds idle & high speed
• Aluminium fuel bowls w/ dual sight glass windows
• Billet metering blocks w/ changeable idle feed & power valve channel restrictions
• 4 corner idle system
• Notched secondary floats
• Secondary jet extensions
• Slabbed throttle shafts w/ Teflon bearing ribbons w/ stainless steel plates
• Billet aluminium throttle body
• Tuneable secondary opening rate, additional secondary links included
• Down-leg boosters/annular boosters

VHave you noticed the price of race gas or even pump premium lately? Smart racers and street performance enthusiasts alike are making the switch to the affordable alternative - E85 with its true 105 octane rating. Quick Fuel Technology, the undisputed leader in E85 carburetor technology has introduced 10 different models with various airflow ratings and calibrations. The Quick Fuel SS-650 and SS-750 models are calibrated primarily for the street, the Q-750 is available for drag, circle track racing or blow-through applications, and Q-850 through 1050s will cover virtually any race/performance application. Hundreds of big-block bracket racers have embraced Quick Fuel's large flange QFX-4710 1050cfm E85 carburetor for its round-to-round consistency and incredible performance.

Not only has Quick Fuel precisely tuned and configured a full line of performance E85 carbs, they have packed them with features that will resist the highly corrosive 85-percent ethanol fuel for years of trouble free performance. Special high-flow bullet style stainless steel needle and seat assemblies prevent sticking caused by fuel contaminants, and E85 resistant GFLT accelerator pumps have replaced traditional rubber pumps. Alcohol resistant floats with stainless steel hinges are designed for improved leverage to close the larger needle and seats. The special billet throttle body and metering blocks have been anodized for protection and the fuel bowls are also coated for corrosion protection. Stainless steel throttle plates glide on Teflon™ coated throttle shafts and feature the QuickLink system that easily change secondary opening rates.

Quick Fuel not only offers complete E85 carbs, they have conversion kits for gas 4500HP® style carbs. These conversion kits contain everything necessary to convert your carb to E85. Quick Fuel also offers billet E85 metering blocks for 4150 style carbs plus all of the individual pieces to make the changeover. Another helpful E85 tool that is essential for E85 racers is Quick Fuel's E85 fuel checker (E-Checker) that measures the amount of ethanol present in E85. This can vary from 70 to 85-percent depending on the refining process. While this is insignificant to street performance drivers, it is vital for racers looking to extract the maximum out of their engines. Although conversion from gasoline to alcohol is fairly straightforward, there are a number of factors to consider before making your conversion. Methanol requires approximately 2 times more fuel flow than gasoline. On the opposite end of the scale, E85 requires approximately 25 to 30% more fuel.

E85 Carburetors