BBK Throttle Bodys
In a fuel injection 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 driver input. While the accelerator is often called a "gas pedal", it would be more accurate to describe it as an "air pedal".
The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor.
The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow.
On many cars, the accelerator pedal motion is communicated through the throttle cable, which activates the throttle linkages, which moves the throttle plate. In cars with electronic throttle control, an electric motor controls the throttle linkages.
When the driver presses on the accelerator pedal, the throttle plate opens up, allowing more air into the intake manifold. Either a throttle position sensor or an airflow sensor measures this change and communicates with the ECU. The ECU then increases the amount of fuel being sent to the fuel injectors in order to maintain the desired air-fuel ratio.
Throttle bodies may also contain valves and adjustments to control the minimum airflow during idle.
Many cars have a single throttle body, however more than one may be used, chained together by linkages, to improve throttle response. At the extreme end, cars such as BMW's M line have a separate throttle body for each cylinder.
A throttle body is somewhat analogous to the carburetor in a non-injected engine. 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. Cars with throttle body injection (called TBI by General Motors and CFI by Ford) locate the fuel injectors in the throttle body, allowing an engine design to be converted from a carburetor to fuel injection without changing the intake layout.
The carburetor, despite all it advances is not an efficiant means of mixing fuel and air. Air bleeds, correction jets, acceleration pumps, emulsion tubes, choke mechanisms, etc., is still a compromise. The limitations of carburetor design is helping to push the industry toward fuel injection.
Direct fuel injection means that the fuel is sprayed directly into the combustion chamber. The fuel injected nozzle is located in the combustion chamber.
Throttle Body injection systems locate the injector(s) within the air intake cavity, or "throttle body". Multi-point systems use one injector per cylinder, and usually locate the injectors at the mouth of the intake port.
The fuel injector is an electromechanical device that sprays and atomizes the fuel. The fuel injector is nothing more than a solenoid through which gasoline is metered.
When electric current is applied to the injector coil, a magnetic field is created, which causes the armature to move upward. This action pulls a spring-loaded ball or "pintle valve" off its seat. Then, fuel under pressure can flow out of the injector nozzle.
The shape of the pintle valve causes the fuel to be sprayed in a cone-shaped pattern. When the injector is de-energized, the spring pushes the ball onto its seat, stopping the flow of fuel.
1546 - 62mm Honda Performance Throttle Body 1.5/1.6L 1547 - 70mm Honda/Acura Performance Throttle Body 1.8L/1.6L 1752 - 70mm Integra GSR Dual-Cam VTEC Throttle Body 1753 - 70mm 1996-2001 Integra Type-R Throttle Body
62mm Eclipse/Talon Throttle Body
30% better flow than stock
Adds 7-10 horsepower
Brand new item - no exchange
This all-new 62mm performance throttle body offers owners of the popular 1994-98 Turbo Eclipse/Talon models a simple way to bolt-on 7-10 horsepower in about 30 minutes. As with all BBK Power-Plus Series Throttle Bodies, each unit starts with a brand-new CNC machined 356 aluminum main body and is assembled with a host of OEM-quality components making it a true bolt-on. This 62mm unit flows approximately 30% better than the stock unit and works great on stock or nitrous equipped models. 1750 - 62mm Eclipse/Talon Performance Throttle Body (1994-98 Turbo)
POWER-PLUS SERIES 65mm 2.0 Liter Ford Focus
30-35% better flow than stock
1751 - 65mm Focus Performance Throttle Body (2.0L Zetec) (1994-98 3.8L V-6) 1754 - SVT Focus Performance Throttle Body
POWER-PLUS SERIES Mustang 3.8 Liter Throttle Bodies
56mm 1994-98 and 70mm 1999-04
Bolt-on 7-10 horsepower in minutes
1548 - 56mm Performance Throttle Body Assembly (1994-98 3.8L V-6) 1552 - 70mm Performance Throttle Body Assembly (1999-2000 3.8L V-6) 1652 - 70mm Performance Throttle Body Assembly (2001-04 3.8L V-6)
* Stock intake manifold may require port matching.
POWER-PLUS SERIES 70mm 4.7 Liter Dodge Throttle Body
AUTOMOTIVE FORUM
In a fuel injection 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 driver input. While the accelerator is often called a "gas pedal", it would be more accurate to describe it as an "air pedal".
The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor. 
The carburetor, despite all it advances is not an efficiant means of mixing fuel and air. Air bleeds, correction jets, acceleration pumps, emulsion tubes, choke mechanisms, etc., is still a compromise. The limitations of carburetor design is helping to push the industry toward fuel injection.
POWER-PLUS SERIES Throttle Bodies for 1990-Current 4.6 & 5.4 2-V Ford Applications
