To produce 1-horsepower for 1-hour requires approximately. To produce torque and horsepower requires a mixture of air and fuel. However, many racers, both novice and experienced alike do not fully understand the physics of fuel flow and horsepower. There's been no shortage of well-researched and well-written articles and books explaining the workings of the fuel system. In high gear, engine speed increases more slowly allowing the bowls to fill again. When the float bowl fuel level drops, the car lays down because of fuel starvation. This rapid acceleration increases the demand for fuel. In the lower gears, the car accelerates rapidly with the engine picking up rpm very quickly. Why? Typically, the carburetor bowls are full at the starting line so the car leaves hard but in the process, drains the bowls dry. If a car is lazy or lays down at mid-track then pulls well in a higher gear, the engine may be experiencing intermittent fuel starvation. The BG Six-valve and Super Speedway mechanical fuel pumps will also deliver ample fuel volume when used according to recommendations.įor drag race cars, an Electric Fuel Pump is the best way to guard against fuel starvation. This feature alleviates "loading up" of the spark plugs. These pumps offer the highest fuel delivery volume of any mechanical pump yet maintains low fuel pressure at low engine speeds. In oval track applications, a Belt Drive or Hex Drive Fuel Pump is preferred where use of a mechanical fuel pump is specified. Even though your car may not miss, pop, bang, skip or do anything else peculiar, it may not be getting all the fuel it needs to make maximum power. The more pounds of fuel an engine can burn efficiently per hour, the more horsepower it produces. The process of producing horsepower revolves around the conversion of fuel into energy. Today's state-of-the-art engines produce a lot more power than a race engine of ten years ago. Many racers experience fuel delivery problems without ever being aware that something is wrong in their race car's fuel systems. Depending upon track length, oval track cars will typically improve lap times by 0.1 to 0.5 second once an optimized air intake system is installed. Paying attention to the inle tract design will pay off. A car will not pick up ET after the scoop is sealed off if the scoop is too short or the fuel delivery system is inadequate. It is not unusual for a drag race car to improve ETs by 0.3 second and increase top speed by as much as seven miles an hour after installation of a sealed scoop. An air bell or radiused intake should be used whenever possible to increase air flow into the carburetor. Air pan kits for sealing the carburetor to the scoop are available or they can be fabricated. Windshield snorkels are especially notorious for siphoning unless the rear is sealed. If air is forced past the carburetor it can siphon fuel, causing the engine to run lean. Otherwise, air will flow across the top of the carb and out of the inlet tract rather than into the air horn. When a hood scoop or external air intake is used, it is highly suggested that the carburetor be sealed to it. If an air cleaner is installed, the tallest possible element is preferred with four-inch element preferred for racing engines over 500 HP. There should be a minimum of three inches of clearance between the top of the venturis and a hood scoop. is approximately equal to a one percent power gain. A reduction in temperature of 10 degrees F. Under hood air is heated by the engine and headers and reduces the amount of power that can be produced. We recommend that a hood scoop or outside air intake should be installed wherever rules allow. This allows the engine to burn more fuel and make more power. The denser the air, the more you can get into the cylinders. Keeping restriction in the inlet path to a minimum - or better yet, pressurizing the air - is also desirable. Air Deliveryįor maximum horsepower, the coolest, most dense air possible should be available at the carburetor inlet. By ignoring these two critical areas, all the work of building a strong powerplant is wasted. There is no substitute for a well-designed fuel and air delivery system. Basic Carburetor and Fuel System Maintenance and Tuning Tips
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