Podcast
Questions and Answers
What is the function of the intake manifold in an engine?
What is the function of the intake manifold in an engine?
- To increase the resistance of air flow
- To decrease the turbulence in the air
- To regulate the flow of fuel into the engine
- To deliver air to the engine through pipes to each cylinder (correct)
Where can fuel injectors be mounted in the intake system?
Where can fuel injectors be mounted in the intake system?
- By the intake valves of each cylinder (multipoint port injection) (correct)
- Inside the exhaust pipes
- At the exhaust of the manifold
- At the inlet of the exhaust manifold
What is the purpose of active intake manifolds in some engines?
What is the purpose of active intake manifolds in some engines?
- To restrict proper mixing of air and fuel at high speeds
- To minimize air turbulence
- To change runner length and diameter for different engine speeds (correct)
- To decrease air velocity at low speeds
Why must the inside diameter of the runners in the intake manifold be large enough?
Why must the inside diameter of the runners in the intake manifold be large enough?
What happens to the diameter of runners in active intake manifolds at high engine speeds?
What happens to the diameter of runners in active intake manifolds at high engine speeds?
Fuel injectors can be mounted:  by the intake valves of each cylinder (multipoint port injection),  at the inlet of the manifold (throttle body injection),  or in the cylinder head (CI engines and modern two-stroke cycle and some four-stroke cycle SI automobile engines) Intake System Intake Manifold The intake manifold is a system designed to deliver ______ to the engine through pipes to each cylinder, called runners.  The inside diameter of the runners must be large enough to avoid:  High flow resistance  low volumetric efficiency.  On the other hand, the diameter must be small enough to assure high ______ velocity and turbulence, which enhances its capability of carrying fuel droplets and increases evaporation and ______-fuel mixing Intake System Intake Manifold  Some engines have active intake manifolds with the capability of changing runner length and diameter for different engine speeds.  At low speeds, the ______ is directed through longer, smaller diameter runners to keep the velocity high and to assure proper mixing of ______ and fuel.  At high engine speeds, shorter, larger diameter runners are used, which minimizes flow resistance but still enhances proper mixing. The amount of ______ and fuel in on
Fuel injectors can be mounted:  by the intake valves of each cylinder (multipoint port injection),  at the inlet of the manifold (throttle body injection),  or in the cylinder head (CI engines and modern two-stroke cycle and some four-stroke cycle SI automobile engines) Intake System Intake Manifold The intake manifold is a system designed to deliver ______ to the engine through pipes to each cylinder, called runners.  The inside diameter of the runners must be large enough to avoid:  High flow resistance  low volumetric efficiency.  On the other hand, the diameter must be small enough to assure high ______ velocity and turbulence, which enhances its capability of carrying fuel droplets and increases evaporation and ______-fuel mixing Intake System Intake Manifold  Some engines have active intake manifolds with the capability of changing runner length and diameter for different engine speeds.  At low speeds, the ______ is directed through longer, smaller diameter runners to keep the velocity high and to assure proper mixing of ______ and fuel.  At high engine speeds, shorter, larger diameter runners are used, which minimizes flow resistance but still enhances proper mixing. The amount of ______ and fuel in on
Flashcards are hidden until you start studying
Study Notes
Intake Manifold Function
- Delivers air and fuel mixture to the engine through runners to each cylinder.
- Runners connect the manifold to the intake valves, facilitating the air-fuel mixture flow.
Fuel Injector Placement
- Fuel injectors can be mounted near intake valves (multipoint port injection).
- Options include throttle body injection at the manifold's inlet or directly in the cylinder head for certain engines.
Purpose of Active Intake Manifolds
- Designed to adjust runner length and diameter based on engine speed.
- At low speeds, utilizes longer, narrower runners to maintain high velocity and enhance fuel mixing.
- At high speeds, employs shorter, wider runners to reduce flow resistance while promoting effective mixing.
Importance of Runner Diameter
- Must be sufficiently large to prevent high flow resistance and low volumetric efficiency.
- Diameter must facilitate high air velocity and turbulence, crucial for effective fuel droplet transport and evaporation.
Runner Behavior at High Engine Speeds
- Diameter increases in active intake manifolds to accommodate higher flow rates and minimize resistance while still ensuring effective fuel-air mixing.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
