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.
Oil in the exhaust is part of the two stroke design but if you have too much, you should check the fuel/oil mixture or the oil injector settings.
The exhaust stroke is the 4th stroke in a 4 cycle engine. 1st is the intake stroke, 2nd is the compression stroke, 3rd is the power stroke and the 4th is the exhaust stroke.
The exhaust stroke is the 4th stroke in a 4 cycle engine. 1st is the intake stroke, 2nd is the compression stroke, 3rd is the power stroke and the 4th is the exhaust stroke.
During the four-stroke cycle, both the intake and exhaust valves are open simultaneously during the overlap period, which occurs at the end of the exhaust stroke and the beginning of the intake stroke. This typically happens just before the piston reaches the bottom of the exhaust stroke and just as it starts to descend for the intake stroke. The overlap allows for better scavenging of exhaust gases and aids in the intake of the fresh air-fuel mixture. The exact timing of this overlap can vary based on the engine's design and camshaft specifications.
It relieves the cylinder of exhaust on the 4th stroke of a 4 stroke engine.
The exhaust plays a great part on a 2 stroke than a 4 stroke. The exhaust system is the only thing that is scavenging the cylinder of the burn gases on a 2 stroke, verses the piston pushing most of the exhaust out on a 4 stroke.
i say that a 4 stroke is faster than a 2 stroke
Suction stroke, compression stroke, power stroke & exhaust stroke
The four strokes of an internal combustion engine are intake, compression, power, and exhaust. During the intake stroke, air and fuel are drawn into the combustion chamber. In the compression stroke, the mixture is compressed. The power stroke is when the compressed mixture is ignited to create power, while the exhaust stroke expels the burned gases from the chamber.
A two-stroke engine is typically louder than a four-stroke engine due to its design and operation. It completes a power cycle in just two strokes of the piston, which means it fires once every revolution, resulting in more frequent exhaust pulses. Additionally, the absence of a dedicated exhaust valve allows for less efficient exhaust scavenging, leading to a louder and more abrupt exhaust note. This combination of factors contributes to the characteristic high noise levels associated with two-stroke engines.
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.
Cross flow scavenging is a two-stroke engine design where fresh intake charge flows across the cylinder horizontally, pushing exhaust gases out through ports on the opposite side. This design helps improve combustion efficiency and reduces the amount of unburned fuel in the exhaust.