Four Stroke Engine Cycle

[engrmaks]

Very simplified Explanation.

[iipmamonto]

Thank you very much for the simple and understandable explanation.

[MsUdontknowme]

how can we download this

[gamesking691]

wow thank you this has helped me so much for my exam :)

[harendra20109053]

fantastic video



[TheDaNNyMaRYn]

I am estudy mechanic and this video is nice

Greetings from Colombia

[TheDaNNyMaRYn]

plased i nedded traduction this video minut 1:23 to 3:43 or text in english. i speak spanish is difficult me. tank

[hom2fu]

well done! basic explanation of the engine. The video is a little old and I would like to see some of the newer engine technology. Like higher compression

[yyGODyy]

Excellent vid. But why would they have 5 stages of a 4 stroke engine? Should there be 4?

[xXMxExGxAxDxExTxHXx]

@yyGODyy a stroke is the up or down movement of the piston, so it makes 4 strokes (2 up, 2 down) before the cycle repeats. you start with the inake stroke, then the compression stroke, then the power stroke, then exhaust stroke. the ignition stage happens right before the power stroke (downward movement) it is not a stroke, it is simply igniteing the fuel, therefore it is a 4 "stroke" engine

hope that helped =D

[SMG516]

Astounding explanation. Truly in depth and everything! :D What's the name of the song in the background? or is it composed just for this video?

[BassWatcher]

Great Explanation! Thankyou very much :D

[fd5848517]

im doing a pros and cons paper for school so can you please tell me about it??

[rasmusfalk]

fascinating 

[whatjamaican]

Thank you for your video.

[Jonrocat]

Where is this video from, what documentary is it out of i would love top get my hands on it, thanks.

[dynamicscoopstar91]

this video was phenomenal, i'm just getting into engines. I really learned in depth from this simple video. way to keep it simple and clear!

[Warblade118]

Now just imagine all that happening in all the cylinders in your car between about 15 to 100 times a second depending on how high you rev your engine.

[teja111222]

teja-when compresson is taking in the car how it absorbe sir give me a repaly

[teja111222]

when compresson is taking in the car how it absorbe sir give me a repaly

[teja111222]

teja -i design a car interior so far it helps to know about engine and its mechanism

[teja111222]

i design a car interior so far it helps to know about engine and its mechanism

[gggromay]

whats 1 rpm? one turn of the rank shaft or one full cycle? if its one cycle how does it apply on a 4 cylinder engine?

[btownmxer]

@gggromay 1 RPM is 360 degrees of crankshaft rotation. There is 720 degrees in a four stroke cycle. so If you have a four cylinder engine only 2 cylinders are firing in one RPM. It takes 2 Revoultions of the flywheel to fire all four cylinders because the cylinders fire 180 degrees apart.

[gggromay]

@btownmxer thanks! so making my math, this is what i get:

my engine is four 4 cylinders and works up to 16500rpm, so it means 16500/60sec = 275r/second, thats 2 strokes to make the full 360 degree of the crankshaft, so each piston does 550 strokes each second!!!! thats one second! thats amazing dont you think? imagine the valves working!!

its just marvelous...

by the way its a yamaha r6

[btownmxer]

@gggromay yeah its pretty amazing what a piece of precision machinery can do when you break it down like how you did. Its beyond perception.

R6 is a nice bike enjoy

[gggromay]

@btownmxer yea it is beyond perception... thanks again

[Turbotrip]

Valve-overlap would make a better performance. And by the way, the intake valve dont close at BDC, but some time after, you dont want loose effect in the already existing airflow, that keeps filling the cylinder. And the exhaust valve typically will open sometime before BDC to use some off the stroke to empty the cylinder.

[btownmxer]

It all depends on the application. Some engines like turbo charged engines use very little valve overlap to combat waste in the exhaust manifold. And as far as opening and closing at tdc or bdc all depends on the camshaft profile. There are hundreds of different profiles that affect timing

[DumbassWithCamera]

why are you watching this if you already know so much about it? p.s. thanks i didnt know that before.

[Quarker99]

Can the compression and ignition strokes be referred to as a single stroke?

is this also the case in Rotary engines?

[CroswhiteK]

Rotary are different. There is another video on youtube that explains the rotary engine. It is actually a great video. just search Rotary Engine.

[thinkRightnFree]

what makes compression to occur ???

[coteya]

counterweight

[rocket60000]

great video

[meetkiru]

good one :)

[johncamara66]

nice

[Stillwind]

Man i can imagine this video being showed in class... and me falling asleep while watching it.... hhahha... aaaah days of youth!

[2605155]

the valves aren't being "sucked" down by the lowering piston. I know it may seem like that but they're pushed down by cam shafts. the exhaust valve is actually pushed hard against all the "explosion" to open.

[chippievw]

No its not, the explosion forces are long gone by then, hence the ''opening the valve to let spent gas out bit.''.

[2605155]

I'm still right. The combustion in the chamber caused a sharp rise in internal pressure. This pressure is exerted in every direction even toward and against the exhaust valves. As the piston reaches the end of it's stroke the pressures have diminished as volume has increased but there is still force acting against the valves that the cam shaft must overcome to open the valves and exhaust the spent fuel-air mix. That work the cam shaft does is small but present. "explosion forces...gone" haha

[chippievw]

Your wrong Im afraid, the force of the spring under valve is far stronger than the forces inside the cylinder acting on say a 33mm valve face at that point. I can do all the math for you if you want to, Im the last 3 yrs designing a cylinder head. What I wont do is get involved in a silly internet comment war about it, Im too old for that anymore.

[munoz1051c]

very good and thourough explanation in this video!

[lanovena9]

lalalal