What determines the amount of valve overlap?
What determines the amount of valve overlap?
Valve overlap occurs when the piston nears TDC between the exhaust event and the intake event. At higher speeds, the extra amount of intake charge brought into the combustion chamber provides a substantial increase in available power. The amount of time that both valves are open in directly related to engine rpm.
What is a variable timing solenoid?
The variable valve timing solenoid is a component of the variable valve timing system that manages the oil flow depending on the engine speed and load. A VVT solenoid in good working condition improves performance and fuel efficiency. Machined to precision tolerances preventing leakage, wear and seizing.
What controls variable valve timing?
Each camshaft has a phasing mechanism which allows its angular position relative to the engine’s crankshaft to be adjusted. One lobe controls the opening of a valve and the other controls the closing of the same valve, therefore variable duration is achieved through the spacing of these two events.
Is variable valve timing good?
There are many benefits to using VVT and virtually no drawbacks. One benefit is an increase in maximum engine speed (and therefore more peak power) – as much as a 25% increase. The exhaust gas recirculation reduces the amount of fuel needed to run the engine and therefore boosts the all-important MPG number.
How does variable valve timing system work?
Basically, it varies the valve timing by shifting the phase angle of camshafts. For example, at high speed, the inlet camshaft will be rotated in advance by 30° so to enable earlier intake. This movement is controlled by engine management system according to need, and actuated by hydraulic valve gears.
What does oil control valve do?
The Oil Control Valve (OCV) is a a critical part used in every engine that is fitted with variable valve technology (VVT). A single control valve will regulate the supply of oil to a designated VVT hub, to advance or retard the timing by altering the camshaft angle position.
What does VVT I means in a car?
Variable Valve Timing with intelligence