Where is the throttle body on an intake manifold?
With the use of port fuel injection or direct port injection has created much flexibility in designs. Most EFI long runner designs have the throttle body at the end of the intake manifold. This location of the throttle body does offer an economical design with benefits of idle and part throttle capability.
What kind of intake does an EFI long runner have?
This intake had 16˝ of runner length with port fuel injection. This offered great bottom end torque with off idle response and some upper rpm power. With the use of port fuel injection or direct port injection has created much flexibility in designs. Most EFI long runner designs have the throttle body at the end of the intake manifold.
How does the throttle body work in a car?
A throttle body is a butterfly valve located between the air intake filter and the intake manifold. It regulates how much air can go into the engine, based on driver input through the gas pedal. As more air flows into the engine, it injects more fuel, thus allowing for more power.
Can a small throttle body EFI be used?
At worst you can have a short-runner single-plane carb style manifold on one, and a long-runner, small-throttle-body EFI manifold on the other. Or, you might have a 90-degree adapter elbow and massive throttle body on that single-plane intake manifold to test the port injection.
With the use of port fuel injection or direct port injection has created much flexibility in designs. Most EFI long runner designs have the throttle body at the end of the intake manifold. This location of the throttle body does offer an economical design with benefits of idle and part throttle capability.
This intake had 16˝ of runner length with port fuel injection. This offered great bottom end torque with off idle response and some upper rpm power. With the use of port fuel injection or direct port injection has created much flexibility in designs. Most EFI long runner designs have the throttle body at the end of the intake manifold.
What should the intake runner cross section be?
Most people use the max. torque rpm as the “tuned rpm”. Also, as a general rule of thumb, the port cross section area should be ~83% of the valve area in the intake port and taper out at a 3.5 degree angle as it goes toward the entry of the runner.
At worst you can have a short-runner single-plane carb style manifold on one, and a long-runner, small-throttle-body EFI manifold on the other. Or, you might have a 90-degree adapter elbow and massive throttle body on that single-plane intake manifold to test the port injection.