Throttle FAQs:

Q: Is throttle the mechanism by which fluid flow is managed by constriction or obstruction?

A: Yes.

Q: Is throttle either open or closed?

A: Yes, or some intermediate position.

Q: Is throttle basically a poppet valve?

A: Yes, or series of poppet valves which open in sequence to regulate the amount of stream admitted to the steam chests over the pistons.

Q: Is throttle in the idle position?

A: Yes, and wide-open throttle position, or somewhere in between these extremes.

Q: Is throttle used to generate intake manifold vacuum?

A: Yes, and thereby allowing the introduction of exhaust gas to lower combustion temperatures and thereby minimize NOx production.

Q: Is throttle typically a butterfly valve?

A: Yes.

Q: Is throttle partially closed?

A: Yes, and a manifold vacuum develops as the intake drops below ambient pressure.

Q: Is throttle closed?

A: Yes.

Q: Is throttle operated either mechanically when the primary plate is opened past a certain amount, or via engine vacuum, influenced by the position of the accelerator pedal and engine load, allowing for greater air flow into the engine at high RPM and load and better efficiency at low RPM's?

A: Yes, Multiple 2-venturi or 4-venturi carburetors can be used simultaneously in situations where maximum engine power is of priority.

Q: Is throttle a valve that directly regulates the amount of air entering the engine?

A: Yes, and indirectly controlling the charge burned on each cycle due to the fuel-injector or carburetor maintaining a relatively constant fuel/air ratio.

Q: Is throttle wide open?

A: Yes, and the intake manifold is usually at ambient atmospheric pressure.