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- เผยแพร่เมื่อ 9 ส.ค. 2023
- 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. - วิทยาศาสตร์และเทคโนโลยี
![USAB Showcase: Australia vs USA [OFFICIAL STREAM]](http://i.ytimg.com/vi/keiEr_MOaSQ/mqdefault.jpg)
The 2-stroke is just beautiful.
yes but it's impossible to lubricate well, have fun rebuilding your engine every 1000km
1000km what ?
@@theoemanuelsson7465that’s why you mix some lubricants into the fuel. Works good enough for bikes and lawnmowers.
@@theoemanuelsson7465you don’t know what you talking about 😂
@@theoemanuelsson7465almost all very large ships diesel are 2 stroke. So reliability is not their problem.
4-stroke: better efficiency, reliable, less pollution but bulky
2-stroke: pocket-sized, more power but much higher pollution and reduced efficiency
Still wouldn't harm the planet the way the WEF does with their thousands of private jets flying to the states every year to talk about emission taxing lmao
@@whyareyoureadingmyname5854is the quantity of jets flying in the air everyday the same as 2 stroke engines? If we're talking about today then yeah 2 stroke engines are kinda hard to see depending on the country. But if it's 20, 30 or even 40 years ago then it is so much more than jets
@@sotongmenari3759stupid
@@sotongmenari3759Can't stop volcanoes and there is also China which doesn't care for pollution laws
@tommasoastaldi2513 question... How is the 2 stoke more powerful if it is less efficient... Or are u referring to efficiency as miles per gallon ?
2 stroke is for speed and 4 stroke is for reliability
Yes ok
wrong lmao more shit to break on a 4 stroke
@@bioptic2074still 4 stroke is reliable and fast compared to 2nd one
@@bioptic2074Two-stroke engines give more power and are lighter, good for small machines. But they use more fuel and pollute more.
Four-stroke engines are reliable and efficient, great for cars and bigger machines. They may have more parts, but they're built to last.
@@Worldp766Four stroke are more reliable than two stroke, but two stroke are faster because they produce power every crankshaft revolution, allowing quicker acceleration, so you're partly correct. (I'm not an engineer, but i love learning about engines)
2-stroke: Squish-Bang
4-stroke: Squish-Squeez-Bang-Fart
Suck squeeze bang blow
It’s suck, squish, bang, blow.
Get it right😂
Fart to you
2 stroke: Braaaaaaappp
@@justsayin4632beat me to it!
The two stroke will better for drag racing
😂
@@avgfinnishdude🥳
Its like eco for smth
Not that good if an engine tho🤦
Bruh what
I like the music it reminds me of my great uncle who loved to play piano in 2004
and r.i.p my uncle
Give 2 stroke
2 stroke is the best❤❤❤
Yamaha 125/135/TZM
Kawasaki RR
Suzuki RGV
HONDA RR
power wise yes sound? nuh uh
Do you own one?
How is? If 4 stroke sounds more powerful
Trabant, Wartburg
Two strokes are good for light load small machines like motorcycles but not good for large machines like trucks or cars 2-stroke has very little torque high RPM 4-stroke has more torque less RPM
Good timing and animation but remember! Ports on 2t are never on same level
I also wanted to write
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.
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.
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
Ever heard of dry sump oil system?
usually because oil is mixed with the gasoline in a 2-stroke, I'm not sure what the technical reason is for this though
@@ronal8824because of the design of the engine, instead of having oil flow through the engine because of the port below the piston that lets gas in it would let oil in too causing too much and the engine would not function properly, if you have a small amount (40:1) and you mix it with the gas you can have a adequate amount of oil lubricating the engine with the minus being more pollution and less reliability
Thank you, for explaining
You are welcome!
Damn that 4 stroke got mad rythm he got it locked down fr 💯
2T POWER💪
En la animación de dos tiempos la lumbrera de escape tiene que estar más alta para que se abra primero
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
I always thought it was about the cylinders it had.
Turns out they’re just different types of engines.
Yep there can be 2-stroke inline 4s and V-8s and anything else just like a 4-stroke (and they don't all look like this cutaway). Even your choice of diesel or gas designs.
I recommend looking up the Detroit Diesel 2-stroke truck engines from decades ago. Highly imperfect but interesting and charming.
2-stroke engine, less friction, more performance per cubic centimeter.
Four stroke
Two stroke
Brain stroke
4 Stroke valves
2 Stroke ports
2 strokes can also have valves, at least the ole Detroit Diesels
Twice efficient on fuel...
Incase your wondering,2stroke engine oil combinations is mixed up with gas which doesn't apply when it comes to 4_stroke engines
None of us were, but thanks. Hey guys, get a load of this dork cosplaying as Einstein! 😂
Both are only one stroke, both are four cycles. The upper one requires two strokes to complete a slower but powerful operation. The lower one, in one stroke, produces a faster, less powerful operation.
(And, the Engineer Otto, only baptized the process as : four cycle engine. The person who did the discovery was an Auto Mechanic).
I have stroke when i watch this
This would have been great to see 25 years ago. It would have mmade it easier to understand
Looks like the forestroke is low on oil.
I always see the 2 stroke as a 1 stroke...
That would be having a combustion event every time the piston changes direction. I'm sure I've seen diagrams of an engine like that but it's pretty darn different.
No, I've a decent enough amount of experience with engines, a 2 stroke has all 4 strokes, intake, compression, power, exhaust. The main difference being compression/intake and power/exhaust happen at the same time. Someone can correct me tho
@@Spartan-3144intake & compression + power & exhaust.
#OneMessageFoundation
2 stoke is immortal.
despite being simpler design wise, their a bit less reliable. so not necessarily accurate.
Oil and gas mixing in two stroke?
Yes (i drive a two stroke)
In most u mix gas 40:1 oil
Yes. Oil is added to gas tank. They enters chamber together.
I suppose it's because the fuel comes from right underneath the piston, so that's also where oil needs to be
I like two stroke engine
4 stroke: reliability, lower emissions
2 stroke: vvvvvvvrvrvrvvrvVRRRRRRVVVVVVVVVV
Por isso o2 tempos tem um giro maior, pq pra cada giro uma explosão
2 stroke engine burn engine oil in combustion chamber 😮😮
VW/Audi 4-stroke drivers:
That's not all engines?? 😄
I love me a 2 stroke engine. Especially an old Detroit diesel 2 stroke
Ew
said 14 year old timmy
El motor de 4 tiempos es más eficiente pero está claro que el motor de dos tiempos ofrece la máxima potencia para un reducido tamaño.
No one can change my mind I love the sound of Yamaha RX 100 my dad owned one more than a decade ago I love the sound 😍
Right on!
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.
Anybody knows what music is playing?
I also want to know. Of course the description doesn't say.
Thats why either 2 or 4 stroke has a cycle.
I'm a mature adult
I'm a mature adult
I'm a mature adult
2 stroke best
4 stroke looking real good here
The perfect use of a short.... Ty
Thankyou
Now 5 Stroke please
4 strokes: •dependable •reliable •efficient
2 strokes: •speed •not anywhere near reliable
Music reminds me of Pokemon for the Gameboy
2 stroke is for racing. 4 stroke is for cruising on your daily commute.
Four stroke engine: I’m designed to be efficient and get a long lifespan
Two stroke: brum brum let me burn your oil before I die in 5000km
More torque
2 zamanlı ve 4 zamanlı motor. 2 zamanlı(times) motor motorsikletlerde kullanılır daha çok. 4 stroke derken aslında 4 işlem olur motorda emme, sıkıştırma, patlama(moment), egsoz 2 zamanlı(stroke) motorlarda egsoz ve emme aynı anda olur. Yani piston içinde egsoz gazı varken içeri yakıt ve hava enjekte edilir böylelikle devir daim döngüsü azalmış olur. Yani 2 stroke.
Well that is certainly not a classical 2 stroke. It is rather a 1 stroke, because it fires on exactly every single compression. It is efficient however, especially since there are conventional valves either.
The 2 stroke is for high speed and the 4 stroke is for torqe
Nah the 2 stroke has a higher power for a smaller engine size
What i see. 2 stroke and 1 stroke
A stroke is the piston moving along the height of its travel. In either direction. The number of strokes an engine is called is how many strokes happen for every single ignition event.
It's 4 and 2 here.
2 stroke engine it was the result of Mr.Otto madness in developing a machine which has now become destructive
Wrong pistons guys
2 stroke give better better performance but carbon emmission inspector says hello😭😭
Modern fuel and oil injected 2 strokes are LESS POLLUTING than 4 strokes..
2 stroke is like the rotary of bikes
2_stroke consists of Suction stroke ,power stroke/exhaust stroke .
Ye 2 stroke engine me Spark plug kaha se aagaya bhai sab us engineer ko 21 topo ki salami jisne bhi banaya hoga 😂😂
Are you mad bro
2 stroke eingen can’t work without spark plug 😂😂😂
You don’t have knowledge about that 😅
Does oil still sit under the crankshaft on 2 strokes?
Wish we should hv had such illustrations in our college days.
คุณทำให้ฉันเห็นข้อดี และข้อเสีย 2 แบบ
Thanks now I got the difference in my grass trimmer and why need the 2 -stroke oil. super video
Glad it helped
Di two stroke seharusnya antara intake dan exhaust tidak boleh sejajar.
Ini sebab dia tak butuh valve.
Mengajari jangan sambil membodohi.
2 stroke Diesel Engine💪🏻❤
Inside cylinder is a piston which is connected to a crankshaft while crankshaft with propeller..In a cylinder four stroke cycle occurs i.e Intake compression power and ignition
thats why 2 stroke smells like gas
Yeh it cause a lot of pollution I mean A LOT
Now I now how my engine in Jalopy works, Thank you!
You're welcome!
which one more efficient?
Four stroke engines are more efficient
If you mean size- or weight- or cost-efficient, 2-stroke.
Fuel efficiency - 4 stroke wins easily.
But a key advantage of 2 stroke is lightweight and the ability to operate at any angle, even upside down.
Hence car engines are 4 stroke while 2 stroke engines are what's normally used in chainsaws, post hole diggers, cut-off saws, line trimmers and other tools where the reduced weight and ability to be used at any angle are important considerations.
Lets see paul allens internal combustion engine
Dumb 2 stroke model, exhaust port opens at almost the exact same time as the transfers, what on earth kinda blowdown period is that 🤣
2-stokes are just not reliable enough to be driven on the street, or any kind of a distance for that matter. But besides the ridiculous amounts of emissions they expell there still ok for things like lawnmowers, weed whips, leaf blowers, chainsaws, and motorcycles that merely go around in circles out in the back 40.
I'm the top one, on a good day.
Tnxx broo
New fresh air will also escape with exhaust gas .
Importantly, air with unburnt fuel already mixed in - probably where it loses most of its would-be fuel efficiency advantage, and definitely not great for emissions either
The music doesn't fit at all
I only need 3 strokes to exploed xDD
Okay so 2 stroke is for speed, 4 stroke is efficiency. Why not a 3 stroke so we can get the best of both worlds 😏 (I’m not a mechanic, I don’t know what I’m talking about)
LMAO! Hah, that's sort of possible in my mind, but it'd be overly complex and in practice would probably be the _worst_ of both worlds 🤣 I like where your head's at though
Check out Stihl's 4-mix motor.
Untuk kaum pemula mana in dan ex nya
I think the windows in two strokes don't be at the same level
Yes exhaust port is higher
2 strokes has there place just not im my garage
Same.
The shed maybe though.
I like it. Tnqx u so much.
Welcome 😊
투스트로크에서 흡입구 위치가 피스톤 하부보다 상부에 있어야 할 거 아닌가요
Im thinking of that 4 stroke might need big flywheel to store all energy to complete all long timed 4 cycles of the engine i think (i rather putting big flywheel on 1 cylinder)
Makes sense, if you want it to be able to idle decently slowly.
I guess lawnmowers get away with decent idle speed since the blade acts like a flywheel, but leafblowers and chainsaws are still usually 2-stroke maybe for that reason?
Plus bc they're handheld so light weight is important
Two stroke uses a reed valve not that
I bought A Mercury 150 2 stroke. So glad I did. Now everything is a 4 stroke. Why? Because it’s so expensive and creates jobs. My 2 stroke will out live me.
How does the v4Stroke, v8Stroke, v10Stroke and v12Stroke work ?!!?!?!
It would be better with the title. ❤
I just bought a Suzuki 30 hp 4 stroke for my 16 V hull.😮
Like my 2 stroke TOMOS love it 🛵
В первом уровень масла меньше минимума в во втором масла вообще нет
Да, ты прав но ещё бензин с маслом смешивается не только в коленвала а ещё и при залитии
You know this video is about Engine stroke right? I'm just checking to make sure
ledakan menghasilkan gerak.
I hope ferrari/lamborghini/pagani/buggati/mclaren & etc buillt supercar 2 stroke engine🥰🥰 ..I wwant buy 5 unit per brand
فقط توضیح نداده چطوری روغنو ایزوله میکنه که بالای سلیندر نره! و یا در عمل دود حاصل از احتراق در بالای سیلندر محبوس میشه و تخیله نمیشه!
The two stroke suit for moped bikes?
yea
Nah. Needs so much oil. Unreliable and kinda polluted. 1/4 of the fuel comes out from the exhaust. Not so practical. It’s better with 4 stroke
Well in Indonesia mostly being used for motorcycles drag racing, because of the engine power to weight ratio, but yeah it's not the best for daily use.
2 stroke to much smoke can kill mosquito
Dois tempos foi abolido pois poliuia muito o meio ambiente mas sem duvidas era o melhor 😮
👀🙏
Don’t go on a to the express way no fast enough great for off the road woods trails a lot safer two stokers