Two stroke vs Four stroke engine #shortsvideo #automotive #automobile #engineering #engine

Here are the key differences between four-stroke and two-stroke engines:

Cycle Type:

Four-Stroke Engine: Operates on the Otto cycle, consisting of four distinct strokes: intake, compression, power, and exhaust.
Two-Stroke Engine: Operates on the two-stroke cycle, combining the intake and compression strokes as well as the power and exhaust strokes.
Strokes per Cycle:

Four-Stroke Engine: Completes one full cycle (intake, compression, power, exhaust) in four strokes of the piston: two up and two down.
Two-Stroke Engine: Completes one full cycle (intake-compression-power-exhaust) in two strokes of the piston: one up and one down.
Power Delivery:

Four-Stroke Engine: Provides smoother and more consistent power delivery due to the separation of intake, compression, power, and exhaust strokes.
Two-Stroke Engine: Delivers power with each stroke of the piston, leading to potentially higher power output at higher RPMs but less smooth power delivery.
Efficiency:

Four-Stroke Engine: Generally more fuel-efficient due to better separation of intake and exhaust processes and improved combustion efficiency.
Two-Stroke Engine: Typically less fuel-efficient due to the mixing of fresh air-fuel mixture with exhaust gases.
Emissions:

Four-Stroke Engine: Tends to produce fewer emissions, including lower levels of unburned hydrocarbons and particulate matter.
Two-Stroke Engine: Often produces higher emissions due to incomplete scavenging of exhaust gases and lubricating oil.
Maintenance:

Four-Stroke Engine: Generally requires less frequent maintenance due to the separated oil and fuel systems and better lubrication.
Two-Stroke Engine: May require more frequent maintenance due to the need to mix oil with fuel for lubrication.
Lubrication:

Four-Stroke Engine: Has a dedicated oil system for lubrication, which helps reduce wear and tear on engine components.
Two-Stroke Engine: Requires oil to be mixed with fuel for lubrication, which can lead to increased oil consumption and potential pollution.
Simplicity:

Four-Stroke Engine: Typically more complex in design due to the separation of processes and additional moving parts.
Two-Stroke Engine: Generally simpler in design with fewer moving parts, making it more lightweight and compact.
Applications:

Four-Stroke Engine: Commonly used in automobiles, trucks, motorcycles, and many other applications.
Two-Stroke Engine: Often found in smaller engines, such as chainsaws, lawnmowers, and some motorcycles, as well as certain specialized applications like outboard motors.
Both types of engines have their own advantages and disadvantages, and the choice between them depends on factors such as intended use, efficiency, emissions regulations, and desired power characteristics.

[tommasoastaldi]

4-stroke: better efficiency, reliable, less pollution but bulky
2-stroke: pocket-sized, more power but much higher pollution and reduced efficiency

[veratix]

2 stroke is for speed and 4 stroke is for reliability

[neppisskaba]

2-stroke: Squish-Bang
4-stroke: Squish-Squeez-Bang-Fart

[astomfenandes]

The two stroke will better for drag racing

[HelpVeshWebsite]

I like the music it reminds me of my great uncle who loved to play piano in 2004
and r.i.p my uncle

[MagenPaiya]

2 stroke is the best❤❤❤
Yamaha 125/135/TZM
Kawasaki RR
Suzuki RGV
HONDA RR

[andrej_vu]

Good timing and animation but remember! Ports on 2t are never on same level

[ouishi]

Damn that 4 stroke got mad rythm he got it locked down fr 💯

[arthurmonbaron]

4 stroke: reliability, lower emissions
2 stroke:

[iRossco]

Because the 2-stroke engine requires scavenging of the exhaust gases from the cylinder there tends to be inefficiencies especially when varying the revs. If the engine is required to maintain constant speed, 2 stroke eff is much better than when varying the speed all the time. 4-stroke doesn't have these limitations so more efficient.
Edit: in fact when designing/tuning the 2-stroke exhaust you take into account the pressure waves in the exhaust system to help draw out the exhaust gases as well as to keep the fresh fuel/air mix from escaping into the exhaust manafold. That's called a tuned exhaust & will work at a predetermined rev power band.

[somerandomassguyontheinter]

for anybody without the involved knowledge, a four stroke is more emissions friendly and has four distinct strokes in its cycle;

intake: the cylinder takes in air and fuel. like a syringe, the piston moves downward in the chamber using vacuum to pull in the mixture. the intake valve is open and lets air in.

compression: the intake valve closes and the piston travels back up into the cylinder, compressing the mixture.

power: the spark plug fires or the compression causes the mixture to combust. the piston travels back down as a result of the exploding gases.

exhaust: the exhaust valve opens and the upward travel of the piston forces the burnt gases out of the engine so the cycle can repeat.

this is a bit of an oversimplification, but a two stroke engine combines the intake stroke with the exhaust stroke, meaning that to complete a power cycle the engine only has to do two strokes. this means two stroke engines are generally lighter and more efficient at the cost of higher emissions and oil consumption.

[Anonymous-ztpk]

Suction, compression, combustion, exhaust.

[derrickgrey]

2_stroke engine it's lighter, produces smoke, oil is mixed up with gas
4_stroke engine, it's heavier, oil doesn't mix with gas

[derrickgrey]

Incase your wondering, 2stroke engine oil combinations is mixed up with gas which doesn't apply when it comes to 4_stroke engines

[robertobrandao]

2-stroke engine, less friction, more performance per cubic centimeter.

[josephmernado]

2stroke engine donot need oil-pan, and best for jet-ski and motocros, since there's no oil pan, it does not require a steady upright positiining, while the 4stroke needs oil-pan, or oil reservoir, so it cannot be operated upside-down

[guillerminacordoba]

En la animación de dos tiempos la lumbrera de escape tiene que estar más alta para que se abra primero

[albertsammut]

Modern fuel and oil injected 2 strokes are LESS POLLUTING than 4 strokes..

[templar]

2 stroke is for racing. 4 stroke is for cruising on your daily commute.

[BigBevev]

I'm glad there's a lack of comments that start talking about power bands as if it's some physical thing you put on the motor.