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.