How a 4 Stroke Engine Works

[lghdg]

Wrong title. This is only one type of a 4 stroke engine, spark-ignition, there is also compression-ignition engines.

[loucarter]

i have a question: if the exhaust spring stays uncompressed(valve shut) or doesn't open fully, will this give a compression issue causing the engine not to fire?

[Frederik19951995]

I have a question: What about the vacuum in the crankase, when the piston moves up??

vaccum in crankase = Makes it difficult for the piston moveing up ?? Am i wrong?

[dkw12002]

Suck, squeeze, burn, blow....see how easy it is to remember the 4 strokes?

[cop083]

during each intake of gas, how much of air and gas is required for the piston to go down?

[mixwell1983]

@cop083 - I'm not sure of actual % but that's why when someone says your car is running lean or rich it means you have too much gas in the mixture. when people say timing and advance timing that is the point where the spark plug ignites the fuel.. When people advance timing they're usually waiting until the piston presses the gas/fuel to its max. if you have negative timing it means that you don't get a large explosion b/c the pressure isn't as strong b/c more space in the cylinder.

[Nickers518]

@cop083 14.7:1 - 14.7 pounds of air to 1 pound of fuel(gasoline). that is the best mixture for maxium combustion.

[cop083]

what causes the valves to open and close? i see the little thing thats spins connected to the valve but what causes those little things to spin. also, what causes the sparkplug to ignite?

[mixwell1983]

@cop083 - The cam shaft is what causes it to open and close.. The crank shaft is connected to your cam shaft with a timing chain which causes it to work together.. Basically as the crankhaft is being forced down and rotating the came shaft is also.. The cam shaft has what's called lifters which are a cushion connect to a push rod... the pushrod is connected to a rocker arm and the came is shaped like a tear drop. tear drop shape is what pushes agains the lifter,which pushes the push rod,which

[mixwell1983]

@cop083 - contd.. the pushrod then pushes the valve down which makes it open.. the valve spring then closes it.. think if it like a seasaw where the pushrod is pushing the rocker arm (seasaw) down on the other side to open the valve and then the valve spring pushes back and when it pushes back the tear drop shape of the camshaft is usually on the normal circular side rather than the tear drop top (which causes it to lift the opposite side of the rocker arm.

[Nickers518]

@cop083 The camshaft is what moves the valves. the crankshaft spins the camshaft, they are connect by a chain or belt.

[cop083]

@Nickers518 Yes,but the camshaft needs to spin first before the pistons go up and down to turn the crankshaft. in order for the crankshaft to rotate, the camshaft has to open the valves so how is it possible for the pistons to turn the shaft. So what starts the process if the camshaft spinning?

[bigdog5986]

That voice sounds HOT!! ;) haha jkjk

[Anoshh50]

you just did my chemistry homework :)

[akinorhan5]

@Anoshh50 lol :D hey i have a tip you can use ethanol on engines :D loololol

[AlsuhailAli]

@Anoshh50 chemistry? shouldn't it be physics?

[BaltoMovie]

What so the second stroke where the piston compresses the fuel, how is it turning ?

Is it turning still from the momentum of the first stroke because that doesn't seem like enough to me

Plz reply I am new to engines

[4uyamahdi]

@BaltoMovie yes it turns from the momentum of the first stroke while the first stroke turns from the power supplied from the starter motor

[rbkhockey83]

@BaltoMovie ya im wondering the same thing haha

[minorpayne23]

For every one who was wondering, the piston probably wouldnt have enough momentum by itself to complete the compression stroke . But the crank shaft (rod it spins) is connected to a weight called a flywheel that keeps the momentum. This is a REALLY basic diagram that shows only the piston and few other parts.

[DjTransilvania]

watching a video you'll not only learn about cars and their engine's how it works

and must read two books that one of them has 600 pages

I read both of them every day

and also learn at school

[vinmns]

very good video

[hairysemi]

why do you think its a diesel? it has a spark plug!!!

[KraZKaiL]

how does the engine turn wheels of a car?

im interested in learning

also, the colour green in the diagram represents air and gas as in gasoline diesel etc. right?

[TheHondaAbuser]

@KraZKaiL an engine itself cannot turn the wheels of a car, it needs a transmition to turn the driveshaft with turns the axles witch turns your wheels

[KraZKaiL]

@TheHondaAbuser

thanks for the reply. seems like a longer process. i hope they teach me all about it

in engineering

[warriorofsteel01]

@KraZKaiL

theres a shaft that transfers power to the back wheels or frotn wheels...you can see these on some of those smaller panel trucks sometimes...there's a shaft that spins under the truck to tranfer power from the engine to the wheel

[MagicPup69]

nah i dont know any of that.

[MagicPup69]

stupid fucking video hurts my head to watch because of the stupid person saying the stuff.

[elegeto]

@MagicPup69 YOu know the volume? The speakerS? You can turn them off.

[mrfourtysevenman]

in nitro airplane engines (2-stroke)

air goes through the carb, through the hollow crankshaft, and the piston sucks it (along with fuel) up into the glow plug. when it goes down the exhaust gets pushed out the muffler and the air pressure from the muffler pumps air into the fuel tank, in turn pumping fuel into the carb.

[DanielBlankevoort]

A diesel does not explode it expance s the air

[gearsofxbox223]

i thought the compression was so high the diesel exploded? not needing a spark plug?..im probably wrong..lol

[Dooooood6]

correct, though its not an "explosion" its air expanding from the heat being released from the deisel burning

[ratkocos]

thats the dumbest thing i have every heard. a diesel engine compresses air which gets so hot that it ignites the fuel

[Gazm742]

Thanks Great vid

[manwithcord]

easy to understand thanks!

[herbienbrian]

your right, it went right over her head. I still love her though, girls lol.

[herbienbrian]

this may help my girl friend undestand engins.