What is actual valve timing diagram?
A valve timing diagram is a graphical representation of the opening and closing of the intake and exhaust valve of the engine, The opening and closing of the valves of the engine depend upon the movement of piston from TDC to BDC, This relation between piston and valves is controlled by setting a graphical …
Why do we use valve timing diagram?
The diagram shows the valve timing diagram for a four-stroke cycle petrol engine. The inlet valve opens 10–30° before the top dead center position. The air-fuel mixture is sucked into the engine cylinder till the inlet valve closes. The inlet valve closes 30–40°, or even 60° after the bottom dead center position.
What is overlap in valve timing diagram?
Valve overlap in valve timing diagram Valve overlap is the short period of time in which both the inlet and the exhaust valve is open. It happened at the end of exhaust stroke and at the beginning of intake. The intake valve opens before piston reaches the TDC and exhaust didn’t close until piston passes the TDC.
What is the valve open after valve timing?
The valves are timed so the intake valve opens slightly before the piston reaches top dead center (TDC) on the exhaust stroke. Likewise, the exhaust valve is timed to close just after the piston starts down on the intake stroke.
What are the types of valve timing?
Stage 1 (low speed) : both intake and exhaust valves are in slow configuration. Stage 2 (medium speed) : fast intake configuration + slow exhaust configuration. Stage 3 (high speed) : both intake and exhaust valves are in fast configuration.
What is the distance between TDC and BDC called?
The distance the piston moves From tdc to bdc is called? This distance, in either direction, is called “stroke”.
What is the difference between TDC and BDC?
TDC – Top Dead Centre is traditionally the position of an internal combustion engine’s piston when it is at the very top of its stroke. BDC – Bottom Dead Centre is the opposite, when the piston is at the very bottom of its stroke.
How does variable valve timing 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.