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How Two-stroke Engines Work



Uploaded by: HowStuffWorks
Video Description:
A car engine uses a four-stroke cycle -- how can two strokes accomplish the same tasks? Learn all about the two-stroke engine, where it's used and how it compares to a four-stroke.


Tags for this video: engines howto stroke two

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Comments for this video on YouTube
i think it opens ... ( 1 month ago by gameoverfm)
i think it opens because of the vacuum and pressure the piston creates when it goes up and down, like an air valve ;)
theres no such ... ( 1 month ago by imurPAPPI86)
theres no such thing as a yamaha 135.
go 2 strokes! ( 1 month ago by neznarftruk1)
go 2 strokes!
Well actually there ... ( 1 month ago by Dominic197VTEC)
Well actually there are Yamaha 135 cc engined bikes out there in different countries but they are all old 2 stroke models. Such as the Yamaha RX135 which was sold in India.
Am I right in ... ( 1 month ago by peanuts2105)
Am I right in guessing they're not the most efficient compared to a 4 stroke?
Yes. The ... ( 1 month ago by urveen)
Yes. The compression ratio is low, so they are thermodynamically inefficient, and a fair ammount of the oil/gasoline/air mixture is expelled from the uncovered exhaust port pre-compression so they are also not very fuel efficient or environmentally friendly, hence why 4 stroke cycles are generally used in larger applications like cars, etc.
Twice the power? ... ( 1 month ago by TuPP3)
Twice the power? What comes to 2 strokes and 4 strokes on wheels, doesn't 4 stroke has more torsion(I'm not sure is that right word, mean like driving up hill), and 2 stoke has more speed.
Is lower part of piston full of gas :O? Why it doesn't just go straight to upper part cylinder instead of filling lower part?
you mean torgue? ( 1 month ago by urbanannihilators)
you mean torgue?
great explanation, ... ( 1 month ago by Quarker99)
great explanation, i was also wondering as soon as the new mixture is let in the exhaust port is left exposed, so its inefficient...
Yep, that's true, ... ( 1 month ago by Quarker99)
Yep, that's true, it creates air pressure...
4 strokes are more ... ( 1 month ago by urveen)
4 strokes are more efficient and for that reason, generally produce more torque because more work can be extracted from the burning air fuel mixture on the power stroke. The reason the mixture is in the crank case in a 2 stroke, is for pre-compression purposes. This helps increase the pressure of the mixture so it flows/gets pumped into the cylinder, and helps offset the lower compression ratio on the compression stroke.
2 strokes make more ... ( 4 weeks ago by BUNCHofxs)
2 strokes make more horsepower but dont make very much torque intill they reach very high rpm 4 strokes CAN make alot of horsepower but torque is made in the lower rpm ranges.
you can bore out a ... ( 4 weeks ago by 3th4n69)
you can bore out a 125 to a 135.
you can even bore out a crf100 to a 135
He's oversimplified ... ( 3 weeks ago by yorrickhunt06)
He's oversimplified and confused the natives...
That illustration is pretty shit and doesn't include the exhaust expansion chamber which makes the engine more powerful and efficient.
You dont get TWICE the power obviously, each combustion is a little less powerful than would be the case in a 4 stroke, but it happens twice as often, so you always get more power (and torque. power is the product of torque and speed) from the same sized 2 stroke.
yes very true and ... ( 3 weeks ago by marter71)
yes very true and mine is a STIHL weedwacker-
I use 1/2 87 octane gasoline and 1/2 E85
(i make the E85,84% Denatured Alcohol,16% Xylene),fuel stabilizer,1 cup amsoil hp injector 2-cycle oil and 1 tablespoon turpentine, i did calculating it is a 95 octane Fuel, works ok
the oil is 32:1 i ... ( 3 weeks ago by marter71)
the oil is 32:1 i apolligize for 2x posting!
you can boe a 125 ... ( 2 weeks ago by Rocker8742)
you can boe a 125 out to a 154
he failed to ... ( 1 week ago by za3eem11)
he failed to mention that there is something called a deflector in the cylinder...at the time when new mixture is coming in and the exhaust is exposed..the deflector, which is located between the exhaust port and the small spacing where mixture is coming in, deflects the mixture to go UP and prevent it from going to the exhaust port making the engine more sufficient as mixture loss is minimized.
he failed to ... ( 1 week ago by za3eem11)
he failed to mention that there is something called a deflector in the cylinder...at the time when new mixture is coming in and the exhaust is exposed, the deflector, which is located between the exhaust port and the small spacing where mixture is coming in, deflects the mixture to go UP and prevent it from going to the exhaust port making the engine more sufficient as mixture loss is minimized
Good point :) that´ ... ( 5 days ago by FARCRY1978)
Good point :) that´s true. Anyway good video
thanks for the vid ... ( 5 days ago by JonathansFilmsInc)
thanks for the vid =]
NICE! ( 5 days ago by Rockyroopam)
NICE!
a piston that acts ... ( 1 day ago by eatdust720)
a piston that acts like a piston? wow never knew that...
a piston that acts ... ( 7 hours ago by zxzap)
a piston that acts like a... piston? what the fuck man



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