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Swirl flap principle in a four-valve engine. A swirl flap is a small butterfly valve fitted to four-stroke internal combustion engines with at least two intake valves.It is installed inside or just before one of a cylinder's two intake ports, allowing to throttle its intake port's air flow, causing a swirl in the other intake port not fitted with a swirl flap.
In double overhead camshaft (DOHC) designs, the air paths may sometimes be connected to separate intake valves [citation needed] so the shorter path can be excluded by de-activating the intake valve itself. Pressurisation A tuned intake path can have a light pressurising effect similar to a low-pressure supercharger due to Helmholtz resonance ...
The actuator consists of a linear servo actuator servomotor that controls a plunger which varies air flow through the throttle body. The position of the servomotor and hence the amount of air bypass is controlled digitally by the engine ECU. This allows the engine's idle speed to be maintained constant.
The ACIS/TVIS System. Acoustic Control Induction System, or ACIS, is an implementation of a variable-length intake manifold system designed by Toyota.. Simply put, the ACIS system uses a single intake air control valve located in the intake to vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency and reduce intake "roar".
The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position. A valve actuator is the mechanism for opening and closing a valve. Manually ...
Carburetors used as intake runners A cutaway view of the intake of the original Fordson tractor (including the intake manifold, vaporizer, carburetor, and fuel lines). An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinders. [1]
The solenoid valve regulates the amount of oil pumped by the cam action to either the valve or a bypass reservoir. When pressurized, the hydraulic line behaves like a solid body and transmits the lift schedule imparted by the intake cam directly to the intake valve. When the solenoid is disengaged, a spring takes over valve actuation duties.
Each MCA-Jet valve and valve seat are a self-contained cylinder-shaped unit that screws into the cylinder head for easy replacement. Aftermarket MCA-Jet valves are available. With the advent of 4-valve-per-cylinder engines, manufacturers typically design the camshaft(s) to open one intake valve slightly before the other to create a swirling effect.