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When Air leaving the exhaust port of a four way valve is directed to?
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Name the two engine valves on a four-stroke engine?
Intake valve and exhaust valve.
What is the correct position of the intake valve and the exhaust valve during most of the power stage in a four-cycle engine?
Closed
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 a valve block?
Could be another name for the four stroke cylinder head, which contains the inlet / exhaust valves.
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 statement correctly describes the position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine?
Both the intake and the exhaust valve are closed.
What happens to a intake and exhaust valve during the power stage cycle in a four cycle gas engine?
If im not mistaken, during the power stage the intake and exhaust valves are both closed. the intake valve opens pulling air into the cylinder (cycle one) and the exhaust valve opens (cycle 4) to relase the air fuel mix that was ignited.
What does a poppet valve do in a four stroke engine?
Controls air intake and exhaust gas out from cylinder in correct time periods.
What correctly describes the position of the intake and exhaust valves during most of the power stage in a four cycle gas engine?
closedUpdated answer,Firstly the four stages of an "Otto Cycle Engine" are, Induction the intake valve is opening, to let fuel and air mixture into piston chamber. Compression the intake valve and exhaust are shut to compress fuel air mixture. Powerfuel air mixture ignited, both the intake and the exhaust valves are closed. And finally Exhaust when the exhaust valve is open to release spent gasses. At idle speed approximately 800 rpm it should be appreciated timing is important.
Why does a cam shaft run at half the speed of the crankshaft?
The four strokes of a four-stroke engine are intake, compression, power and exhaust. The crankshaft controls the upward and downward motion of the pistons. The camshaft controls the opening and closing of the intake and exhaust valves. Intake stroke- the intake valve is open and the exhaust valve is closed. The piston moves downward, decreasing the pressure in the cylinder, which draws the fuel-air mixture in through the intake valve. Compression stroke- both the intake valve and the exhaust valve are closed. The piston moves upward, compressing the fuel-air mixture. When the piston nears TDC (top dead center), the fuel-air mixture is ignited by the spark plug. Power stroke- both the intake valve and the exhaust valve are closed. The explosion caused by the ignition of the fuel-air mixture (combustion) forces the piston downward. Exhaust stroke- the intake valve is closed and the exhaust valve is open. The piston moves upward, forcing the gases produced by combustion out of the cylinder through the exhaust valve. So, for each firing of a given cylinder, the intake valve opens once and the exhaust valve opens once. But, for each firing of a given cylinder, the piston must travel downward and then upward twice (in each direction.). Therefore, the crankshaft must rotate twice per given cylinder firing, while the camshaft rotates only once per given cylinder firing.
How do Small engines work?
they work using the four stroke system the first stroke is the induction as the induction valve is open and the exhaust is closed the descending piston draws the air/fuel mixture in to the cylinder bore. step two compression both valves are closed as the piston travels up the air fuel mixture is compressed at tdc the spark occurs and ignites the fuel step three exhaust the exhaust vale opens and as atmospheric pressure rises with the rising piston the exhaust gasses are forced out through the exhaust valve step four is the repat of step one
What is the correct position of the intake and exhaust valves during most of the power stage in a four cycle gas engine?
During the power or combustion stage of a piston cycle, both valves are necessarily closed, because the expansion of gases is driving the piston down.
