What is VTEC and how does it work?
The VTEC system essentially combines low-RPM fuel efficiency and stability with high-RPM performance. And the transition occurs seamlessly, allowing for smooth performance across the entire powerband. The switching operation between the two cam lobes is controlled by the engine computer.
What is VVT and lift?
Continuous valve lift systems typically allow for the elimination of the throttle valve. When used in conjunction with variable valve timing (VVT), variable valve lift can potentially offer infinite control over the intake and exhaust valve timing.
Which is better Vvl or VVT?
Variable valve lift is mainly used to enhance performance. Instead of having one cam profile for the entire rev range, a VVL engine has two: low-lift and high-lift. Variable valve timing, on the other hand, is used mainly for emissions control.
How does the variable valve timing and lift ( VTEC ) system work?
The Variable Valve Timing and Lift Electronic Control (VTEC) system activate the VTEC solenoid valve by the command from the Powertrain Control Module ( PCM ), and it charges/discharges the hydraulic circuit of the VTEC mechanism that is installed in the valve system to switch valve timing between Low and High.
How does variable valve timing affect fuel efficiency?
Variable valve timing can significantly increase both the power and fuel efficiency of an internal combustion engine. Electronic valve control (EVC) systems attempt to optimize the valve timing over the entire range of possible engine speeds.
How does electronic valve timing control work in an engine?
Electronic Valve Timing Control. The valves in an internal combustion engine open and close to allow both the fuel-air mixture to enter the cylinder prior to combustion and to allow the exhaust gases to exit the cylinder after combustion. In most engines, the valves are opened by lobes connected to the camshaft.
How does electronic valve control ( EVC ) work?
Electronic valve control (EVC) systems attempt to optimize the valve timing over the entire range of possible engine speeds. Most existing systems manipulate the valve timing using a computer controlled actuator attached to the camshaft. Sometimes two camshafts are used, one to control the intake valves and the other to control the exhaust valves.
The Variable Valve Timing and Lift Electronic Control (VTEC) system activate the VTEC solenoid valve by the command from the Powertrain Control Module ( PCM ), and it charges/discharges the hydraulic circuit of the VTEC mechanism that is installed in the valve system to switch valve timing between Low and High.
How does Honda variable valve timing system work?
VTEC is a type of variable valve-timing system developed and used by Honda. It stands for V ariable Valve T iming & Lift E lectronic C ontrol. Like most other variable-valve timing systems, VTEC varies oil pressure to shift between different cam profiles.
What does VVL stand for in valve timing?
The term VVL stands for ‘Variable Valve Lift’ while VVEL stands for ‘Variable Valve Event and Lift’. The term VVTL stands for ‘Variable Valve Timing and Lift’ which is an advanced supporting system to alter the ‘lift’ of the valves.
What is the difference between timing and lift?
Timing refers to an angle measurement of when a valve is opened or closed with respect to the piston position (BTDC or ATDC). Lift refers to how much the valve is opened. Duration refers to how long the valve is kept open.