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Why we open the inlet valve on the exhaust stroke and the exhaust valve on power stroke?
While there may be some overlap of valve opening timing, generally speaking, the exhaust valve opens after the power stroke, and the intake valve opens after the exhaust stroke. Recap... We start the combustion cycle of a standard 4-stroke engine with the intake stroke, the intake valve is open and the vacuum created by the downward movement of the piston draws in the air/fuel mixture from the intake manifold. The intake valve closes as the piston rounds bottom dead center and the compression stroke begins on the upward movement of the piston. At or near the top of the compression stroke, the spark plug fires (both valves are closed at this point) and begins the downward power stroke. As the piston rounds bottom dead center again, the exhaust valve opens to allow the piston to push out the exhaust gasses during the upward exhaust stroke. As the piston gets to the top, the exhaust valve closes and the intake valve opens to start the process over again.
What else can I help you with?
What is the purpose of the inlet exhaust valve?
there is no such thing as an inlet exhause valve, you have the inlet valve which lets your air/fuel mixture enter the engine for the power stroke and the exhaust valve which allows the burnt out air/fuel mixture to leave the engine after that the inlet valve re-opens and lets fresh or new air/fuel mixture enter to let it be compressed and combust for the power stroke. First, the correct name is "Intake" valve. There are intake, intermediate intake and exhaust valves in some newer foreign made engines.
What is overlapping of valves?
Valve overlap occurs in a four-stroke engine at the end of the Exhaust stroke and at the beginning of the Induction stroke; and is when both the exhaust and inlet valves are open at the same time. At the end of the Exhaust stroke, the Exhaust valve is closing and the Inlet valve is starting to open in preparation for the induction of fuel and air into the cylinder. It is common knowledge that in vehicles that cannot alter the valve timing, the Inlet valve opens approx 6 degrees before top-dead-centre and the Exhaust valve closes at 9 degrees after top-dead-centre
What is meant by the term valve lead in the motor industry?
The term "Valve Lead" best describes the amount in degrees in which a valve will open before its desired stroke begins The amount of Valve lead can be influential in the amount of air being drawn into the engine. If the inlet valve is opened before the piston has reached TDC on the exhaust stroke it will increase the amount of air going in for the induction stroke. This is also true if the Exhaust valve is opened before BDC on the power stroke the exhaust gases will get a head start in leaving the cylinder allowing more space for inlet gases to enter.
What is a valve block?
Could be another name for the four stroke cylinder head, which contains the inlet / exhaust valves.
Moving parts of a two stroke engine compared to a four stroke?
Two strokePistonConnecting RodCrankshaftFour strokePistonConnecting RodCrankshaftCamshaftCam follower (inlet and exhaust)Rocker (inlet and exhaust)Valve (inlet and exhaust)Cam drive (belt or gear)Typically a two-stroke is air cooled, while a four-stroke is water cooled, so the water cooling adds these additional items:Water pumpFanFan / pump drive (typically belt)
What is valve overlap?
Valve overlap occurs in a four-stroke engine at the end of the Exhaust stroke and at the beginning of the Induction stroke; and is when both the exhaust and inlet valves are open at the same time. At the end of the Exhaust stroke, the Exhaust valve is closing and the Inlet valve is starting to open in preparation for the induction of fuel and air into the cylinder. It is common knowledge that in vehicles that cannot alter the valve timing, the Inlet valve opens approx 6 degrees before top-dead-centre and the Exhaust valve closes at 9 degrees after top-dead-centre
What is the value of inlet exhaust valve spring design in 4 stroke 2 wheeler?
This design allows more power to be made available for the 4 stroke 2 wheeler. Multi-valve engines allow the more higher RPM's to be achieved, thus resulting in more power being made.
Why does inlet valve opens before the beginning of suction stroke?
for completely entering of fresh charge the inlet valve opens before suction stroke
Inlet exhaust valve what is it?
An inlet and exhaust valves are two separate things. The inlet valve lets the fuel/ air ,ix into the cylinder. The exhaust valve opens to let the pressure out after the mix has burned, releasing the gasses. Then the process starts over again.
What is the Difference between inlet valve and exhaust valve?
the difference is that the inlet valve takes air (oxygen) from surrounding in order to combution of fuel which result in blast by air fuel mixture and piston rotates while the exhaust gases removed from the exhaust valve.again the inlet valve opens first before blast and exhaust valve opens afterward
How does a four stroke exhaust power valve work?
Valve operation: The valves are generally powered by an electronic actuator, which activates (opens) at a certain engine RPM, ideally the actuator would be tuned to operate the valve continuously over the entire rev range, with the valve blocking the flow at low rpm, and opening up to allow free flow of exhaust gases at high rpm. Why it works? The 4 stroke exhaust powervalve increases backpressure, depending on engine configuration this may be to reduce inlet charge flowing out of the cylinder on engines with large valve overlap (both inlet and exhaust valves open). This is just an opinion, im not an expert on the subject. But i am awesome.
Are Both valves closed on the power and exhaust strokes?
In a four-stroke engine, both the intake and exhaust valves are closed during the power stroke, allowing for maximum pressure to build from the combustion of the air-fuel mixture. Similarly, during the exhaust stroke, both valves are also closed momentarily after the power stroke until the piston moves up to expel the exhaust gases. However, the intake valve opens before the power stroke begins, and the exhaust valve opens at the end of the power stroke to facilitate the exhaust process. Thus, while both valves are closed during the power and exhaust strokes themselves, they open at specific times in the cycle.
