Car Engines – Explained

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.


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