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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.
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∙ 16y ago
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How many intake events are there in one revolution of a four cylinder engine?
There is only one intake stroke in a four-stroke engine. The other three strokes are compression, power, and exhaust. The intake stroke is a down stroke of the piston in which fuel is drawn into the cylinder while the fuel intake valve is open. The next stroke is the compression stroke in which the valves are closed and the fuel is compressed for combustion. The following stroke is the power stroke - a downward stroke of the piston after fuel combustion that drives the crankshaft. The final stroke is the exhaust stroke, an upward stroke of the piston as the exhaust valve opens to relieve the exhaust fuel fumes.
What are the four strokes of a internal combustion engine?
intake stroke, compression stroke, power stroke, exhaust stroke in that order
Name the two engine valves on a four-stroke engine?
Intake valve and exhaust valve.
How does a four stroke engine generate power?
Intake compression ***** POWER**** exhaust
Describe how a four stroke engine works?
The strokes of a four stroke engine are intake, compression, power, and exhaust. The engine takes in the fuel, compresses it, uses it for power, and then the excess fuel comes out the exhaust.
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 the sequence for a four stroke engine?
1342 Intake Compression Power Exhaust
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 a valve block?
Could be another name for the four stroke cylinder head, which contains the inlet / exhaust valves.
What is the difference between a 4-stroke and a 2-stroke?
A four stroke engine requires the piston to travel up and down a total of 4 times to complete one full combustion process. The 4 strokes are: intake, compression, power (ignition), exhaust. And the intake and exhaust valves are timed accordingly. A two stroke engine fires ever other stroke and uses ports for intake and exhaust (no valve train)
How fuel works in cars engine?
All gasoline engines are four-stroke designs. An engine has an intake stroke where the intake valve is open and the piston is moving downward, creating a vacuum that sucks the fuel into the cylinder. The next stroke is the compression stroke. The intake valve closes, and the piston begins to move upward and compresses the fuel in preparation for ignition. The third stroke is the power stroke. The piston is approaches the top of the cylinder in the compression stroke. Just before it gets to top dead center, the spark plug fires and ignites the fuel. The fuel rapidly expands and pushes the piston down with great force. The last stroke is the exhaust stroke. In this stroke, the piston completes the power stroke and begins to rise again. At this point the exhaust valve opens, and the piston forces the exhaust out of the cylinder in preparation for the intake stroke.
What does a poppet valve do in a four stroke engine?
Controls air intake and exhaust gas out from cylinder in correct time periods.
