Noob here. I get the difference between a 2 stroke and 4 stroke engine cycle, and how gas vs diesel engines work...

Noob here. I get the difference between a 2 stroke and 4 stroke engine cycle, and how gas vs diesel engines work. But how does it start? No videos show how the cycle fucking starts and it's bugging me.

>starter turns the engine over
>starts sucking in air
>fuel pump and injectors throw in fuel
>computer tells the coils to fire

I'm more interested in diesel.

So the starter is like an electric motor powered by the battery that starts turning the piston? And then as soon as the first injection gets ignited, it runs on it's own? How does RPM and different gears affect things?

Technically?
Compression is the first/last stage

Compression
Combustion
Exhaust
Intake

Exhaust can also be first.

ok, so you know how it works when the engine is running right?
the power from the bang after the suck forces the piston back down right?
ok, if you think of a stationary engine as only missing the band stroke you need to replace it with something else, this is when the starter motor/kick start/hand crank come into play, they start the whole motion at the same time powering all the auxiliaries required to get the engine to suck bang blow

Diesel?
It combusts as pressure builds.
This pushes the piston back.
Now its running on it's own.

RPM is how many cycles per minute the engine makes.
Transmission gearing;
Low gears require the engine to turn more often to make one turn of the driveshaft. This stops the engine from stalling at low speed. Higher gears lower the ratio. Overdrive gear(s) actually have the wheels turning more than the engine.

And different gears affect the speed of the cycle? How does RPM and torque and horsepower and all come into play? I know turbochargers take the exhaust and push it back into the cycle for higher compression.

>cycles
Full rotations (2 cycles for 2 stroke, 4 for 4 cycle).
My bad

2 stroke = ignition every time piston hits TDC
4 Sstroke = ignition every other time, fancy valves and shit

riden a geared bicycle?

in low gears your legs go like fuck and you go slowish, but theres less effort required to move, your energy is being converted into torque, low rpm usually equals high torque, USUALLY

in a higher gear you move faster, less turning of the pedals, but far more work is required from your leg muscles

so torque is kinda like using the lower gears to get up a steep hill, the more toque you have the greater the pulling power