Trick Question! ...depends on the RPM the engine is running at.
Intake valve and exhaust valve.
In a 2 stroke engine the piston itself is the intake/exhaust valve, instead of having separate valves as in the 4 stroke. The odd shape of the piston is the location of these valves.
In a 2 stroke engine the piston itself is the intake/exhaust valve, instead of having separate valves as in the 4 stroke. The odd shape of the piston is the location of these valves.
Two. Intake, and exhaust.
all strokes are the same intake, compression, power, exhaust but it all happens in 2 revolutions of the crank instead of four revolutions like 4 stroke. Also 2 stroke has no valves and four stroke has intake and exhaust valves. hope this helps
Four stroke engines must have at least 2 valves: one exhaust and one intake. Most modern engines are going to 4 valves per cylinder to allow the intake and exhaust strokes to be more efficient.
A two-stroke engine does not have a cam or camshaft. Seeing there is no intake/exhaust valves it would be pointless to have a camshaft.
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)
As an air/fuel mixture is drawn into the intake ports, intake valves open to allow the mixture to enter the cylinder. On the exhaust stroke of an engine, the exhaust valves open, allowing the burned air/fuel mixture to exit out the exhaust ports. Intake valves are larger than exhaust valves, and are able to be found on the "cold" or intake side of the cylinder head(s).
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.
There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap. This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.
generally speaking if it has valves its a 4 stroke 4 cycle engine......if it doesnt have valves then it is a two stroke 2 cycle...................