Car Engines – Explained


hey everyone now in this video I’ll be explaining
car engines , now I know that for a lot of my subscribers,
this will probably be just mostly review, but I
want to have a starting point where if someone comes in new they can have a good way of getting
to seeing how cars work. so this is that way. And so were are going
to talk about engines and how they work. so first I’m just going to go through pretty
much all the components within the engine and
then I’ll talk about how they work together. so just starting at the top, we’ve got fuel
injectors which spray fuel into your intake manifold
Here we got a camshaft that’s responsible for opening valves that allow
air to go in or out of the cylinder. We’ve got rocker arms which connect
camshaft to the valves. We’ve got these valves here which
open/close allowing air to come in or go out depending on which side. We’ve got the cylinder
here, so depending on what kind of engine you
have the V eight, V six that’s how many cylinders you have, six cylinders for V six and 8 for
a V eight so we got piston here this is what
moves up and down and when you turn this vertical motion into
rotational motion in order to move your car we’ve got connecting rod which connects
the piston to the crankshaft we’ve got the crankshaft which is connected
to all the different Pistons within the engine
and so they all supply the torque to this rod. And then we’ve got a spark plug
which ignites the air/fuel mixture which you put in
so this video we’re gogin to be looking at a four
stroke gasoline engine pretty much most common here in America
so that’s why I chose it so are how does all this work well you’ve
got four strokes
so I got to go through each these, so I can explain
what’s happening here. so your first stroke is intake, so when you have your intake stroke
this valve here, your exhaust is going to be closed. This camshaft here, is going to
be rotated enough so that this valve is pushed open, there is a little spring here that compresses
and opens this valve. When it is compressed, when that’s pressed down, this piston is going
to be at the top and it going to be moving down so that piston moves down its gonna pull
and air fuel mixture into this cylinder, so that the air fuel mixture comes in from the
fuel injector and the air coming in from you’re intake , so that’s gonna be the first step.
Pulling in the air-fuel mixture into this cylinder chamber. so that this piston will
be all the way doen here, at the bottom. NOw your next step is compression. So for compression,
both of these valves will be closed.This Camshaft will be rotated in a manner that neither of
these are open, so you can see there is a little lobe here, and it rotates about this
centre duct, so it only open when the camshaft is pointed toward those otherwise they’re
gonna remain closed. so both of these valves are closed, and our piston is down here at
the bottom. Now the next step is compression , that piston is gonna move back up and as
it moves back up its gonna compress the air and the fuel that are then put into inside
of the cylinder.Now finally the power stroke, once that piston gets all the way to the top,
a spark ignites and you have a little explosion that occurs and heres that fire spread and
it forces that piston back down into to the bottom. Now you’ve got just exhaust gases
in here, you’ve burnt up the oxygen, there is no oxygen remaining but if you’ve burnt
it perfectly and so you want to get rid of that air so this cam shaft here will rotate
and pushing this rocker arm, so this will open up this valve and as the cylinder, as
the piston come back up it pushes out the exhaust gas out of this exhaust, the headers
here, so thats the final step. So lets once again go through those real, quickly intake,
you’re pulling in the air and the fuel, that cylinder, that pistoon moves down, compression,
you’re just squeseing all that air and fuel mixture into a very small space. Power stroke,
you ignite that air fuel mixture that pushes the piston down providing a torque on that
crankshaft and then exhaust, you wanna get that air squeesed back out, so the piston
come back up and pushes out the remaining exhaust, and then the cycle just repeats itself.
and goes on and on and on. SO lets look at the big picture, so here, we’ve got a basic
two cylinder engine connected to the crankshaft, so what happens after you’ve supplied that
torque to the crankshaft. Well that torque helps rotate the flywhell which is connected
to the crankshaft, and that flywheel maintains a momentum the keeps the engine running smooth
and it is attached to a clutch. If you buy a brand new car or a torque inverter if you
buy and automatic car , now that then passes to a transmission depending on automatic or
manual transmission, and then so you have gears in there, to change up the speeds, and
the torque passing through and then ultimately you pass that torque to the drive shaft. Now
the drive shaft sends the torque to a differential which puts the torque between the left and
the right tyres now this can go either in the front or the back. In this drawing here,
i’ve got it going to the rear wheels, so these rear wheels are driving and so that ultimately
that torque passes to these two wheels , they rotate and the car moves forward, so thats
the general idea of a car engine and how it moves you now i’ve got topics on all of these
in much bigger details and different types so you can go in and look at those and understand
all these much better, so this is a great starting point to see the general picture
of it all works and then from there you can get into more detail of, say, a clutch or
torque inverter, differen transmissions, and you know, flywheel, the engine, different
types of the engines, suspension setups everything, so it is a great starting point, if you understand
all this. and probably the next video that you should watch, after this, would be diesel
versus gasoline and that would explain in detail and how diesel engine differs from
a gasoline engine.