Ok, how the heck does a two stroke engine work?

[notfred]

OK, I'm pretty good w/ 4 stroke here, but how do they combine intake, exhaust, compression and power into two strokes? the only way I can think of is to have the top half of the dtroke for compression and power, and ther bottom half for intake and exhasut, but then intake is BEFORE exhasut, and you end up with some crappy mixture of exhasut and fuel to burn, and you dump fuel out the exhaust.

So, how do these things actually work?

 

[Rallispec]

2 stroke engines are not nearly as effieceint as 4 stroke. In all actuality they suck.. I can only ever think of people making them becase they are simpler to make and smaller. (good for small handheld things like weed whackers)

i think you're theory on how they work is right, becuase i know they waste a lot of un burned fuel.

 

[DnetMHZ]

http://www.howstuffworks.com/two-stroke.htm

 

[StageLeft]

How they work

 

[Rallispec]

this is based on my knowledge of how engines work from watching every episode of junk yard wars 50 times.

 

[Adul]

2 stroke engines

 

[Rallispec]

Originally posted by: Skoorb
How they work

weak... anybody can go look stuff up there.. its way more fun to guess and make up your own answers.

 

[Adul]

lol three of us thought the same thing

 

[Adul]

Originally posted by: Rallispec

Originally posted by: Skoorb
How they work

weak... anybody can go look stuff up there.. its way more fun to guess and make up your own answers.

 

[Beau]

2 stroke engines

 

[Rallispec]

Originally posted by: Adul

Originally posted by: Rallispec

Originally posted by: Skoorb
How they work

weak... anybody can go look stuff up there.. its way more fun to guess and make up your own answers.

baa

have you looked here?

baaa baaa

 

[Viper GTS]

Now that the original question has been thoroughly answered, does anybody have any diagrams of how a W cylinder configuration works? (ie VW's W12/W16).

Viper GTS

 

[Bulk Beef]

They make sense when you realize that the bottom end (below the piston) is part of the intake tract.

As the piston moves up, it pulls air-fuel into the bottom end while at the same time pushing spent charge out of the exhaust port.

As the piston moves down, it pushes the fresh charge from the bottom end through the transfer ports into the top end.

 

[MajesticMoose]

Actually two-strokes are far simpler in design and have a much better power to wieght ratio. That is why they are used in things like weed-eaters and such. Simplicity means less stuff to break, how that makes them crappier, I have no clue. As for being less efficient, I'm not sure fuel wise. But they are more efficient power-wise per displacement.

As for how they work, It isn't too complicated. Check out the how stuff works link, that has everything you'll want to know probably

 

[Rallispec]

now will somebody explain a rotary engine to me...
(the first person to post a howstuff works link gets a beating )

 

[LAUST]

Actually 2 stroke motors are more efficiant, in some 250cc 2 stroke series you can run a 450cc 4 stroke because the 2 stroke has so far less parts (Rotating mass) that they make incrediable power, I've seen some 125cc 2 strokes producing 45HP!!

No CAM, no Valves... none of that extra stuff to run, and you replace the Ring and sometimes the Piston and it's as good as new in less then 30 minutes

 

[notfred]

ok, so I was basically right.

 

[Beau]

Originally posted by: Viper GTS
Now that the original question has been thoroughly answered, does anybody have any diagrams of how a W cylinder configuration works? (ie VW's W12/W16).

Viper GTS

Aren't they just two v-stroke engines on a common crank?

 

[Beau]

Rotary Engine

 

[LAUST]

Originally posted by: Rallispec
now will somebody explain a rotary engine to me...
(the first person to post a howstuff works link gets a beating )

I'd rather eat glass and take the beating then try to explain how a triangle rotor produces compression.

 

[Beau]

Originally posted by: Viper GTS
Now that the original question has been thoroughly answered, does anybody have any diagrams of how a W cylinder configuration works? (ie VW's W12/W16).

Viper GTS

Forbes article on a W8

 

[ElFenix]

Originally posted by: LAUST

Originally posted by: Rallispec
now will somebody explain a rotary engine to me...
(the first person to post a howstuff works link gets a beating )

I'd rather eat glass and take the beating then try to explain how a triangle rotor produces compression.

as the rotor comes around the axle moves laterally a little bit which compresses the air against the wall opposite from the valves. the chamber is an ovoid shape, not circular.

 

[Evadman]

Originally posted by: ElFenix

Originally posted by: LAUST

Originally posted by: Rallispec
now will somebody explain a rotary engine to me...
(the first person to post a howstuff works link gets a beating )

I'd rather eat glass and take the beating then try to explain how a triangle rotor produces compression.

as the rotor comes around the axle moves laterally a little bit which compresses the air against the wall opposite from the valves. the chamber is an ovoid shape, not circular.

Kinda like the shape of the number 8. The huge thing witha wankel engine ( or rotary ) is that for every rotation of the crank, you get 1.5 compression "cycles" in a 2 cycle, you get 1 in a 4 cycle you get 0.5. Look at the power to weight ratios as LAUST said. The 2 cycle has the power cycle 2x as much as the 4 cycle. They may be dirty, and inefficent, but for their size, they crank out some serious power. 2 cycles also have the second highest possable RPM as there is no valve train to move, only a reed valve that is moved my air pressure differentals. Rotary engines can reach atmospheric RPM's because the "piston" is already spinning with the crank, not going up and down.

2 rotor wankels in the range of 2 liters can make 800+ HP easy. The problem comes in sealing the combustion cyl from the gasses.

 

[toph99]

2 stroke diesles are cool much more efficient, only they can't be made in small sizes like for lawnmowers because they need forced induction.

rotary motors are incredibly cool... assuming the apex seals hold(they are the weak link on rotarys) they can go to incredible rpms, because nothing is reciprocating, only rotating. My friend's dad has a 92 RX7(non turbo) and it's very smooth, and loves to rev

 

[Bluefront]

I messed around with 2-stroke motorcycles for years. I built up a Kawasaki Mach III, 500cc three cylinder, two-stroke, into a semi-street/race bike. The damn thing was so fast it put the fear of God in me..... you could put the front wheel in the air on a 3-4 shift at 90mph. Never did try for top end...I estimated it at 120mph. A comparable 4-stroke of 500cc at the time (1971), was a joke in a race. In it's final form, with all the tuning, carbs, pipes, etc., it got about 15mpg...terrible. But two-strokes were king in those days...