Ford Racing Throttle Body
In a fuel-injected engine, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine in response to the driver input. This performance part is usually located in between the air filter box and the intake manifold and is typically attached to or near the mass air flow sensor. Within the throttle body itself, the largest part is the throttle plate, which is a butterfly valve that regulates air flow. The throttle body contains valves and adjustments to control the minimum airflow during idle. Many vehicles have a single throttle body. However, more than one may be used, and that can be chained together by linkages to improve the throttle response. At the extreme end, a number of vehicles have a separate throttle body for each cylinder. Whenever possible, the throttle should be larger in diameter than the restrictor to prevent unnecessary pressure loss. However, the advantages of increasing the throttle size will die off after such point. The size of the throttle and the angle of reduction to the restrictor can both be varied and both will affect the pressure loss in that area of the intake system. The throttle body for the fuel injected engine is somewhat analogous to the carburetor in a non-injected engine. The carburetors combine the functionality of the throttle body and the fuel injectors into one; that is, to modulate the amount of air flow and to combine air and gas together. The Ford Racing Throttle Body features larger capacity throttle body flows of about ten percent more air than the stock ones. The package also comes complete with idle-air bypass valve and a throttle position sensor.
