INTERNAL COMBUSTION ENGINES. EXTERNAL VS INTERNAL external- combustion engine typically steamed...
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Transcript of INTERNAL COMBUSTION ENGINES. EXTERNAL VS INTERNAL external- combustion engine typically steamed...
INTERNAL COMBUSTION ENGINES
EXTERNAL VS INTERNAL
external- combustion engine typically steamed powered heated water would produce steam to increase pressure
in a piston therefore pushing it to turn a wheel
EXTERNAL VS INTERNAL CONT.
Internal- powered by controlled explosions Multiple cylinders turn a crank shaft to produce rotary
force that turns the wheel
BASICS OF INTERNAL COMBUSTION ENGINE Gas and oxygen are pumped into cylinder as piston goes
down Gas and oxygen are compressed as piston moves up Spark plug ignites, creating explosion and pushing piston
down Exhaust is pumped out as piston goes back up
Four stroke engine
BASICS CONTINUED
Why four strokes? Why not just one cylinder?
HOW IS A TWO STROKE DIFFERENT? Both input and output valves are open at the same time Less efficient, unused gas is let out Lightweight Less parts
PARTS WORKING IN UNISON
Timing belt allows everything to work in unison
CARBURETOR VS FUEL INJECTION
Carburetor in older model cars. Puts fuel into engine by creating pressure differences. mechanical
CARBURETOR VS FUEL INJECTION CONTINUED Modern way of getting fuel into engine More efficient Electronically controlled
OCTANE RATING
Measurement of “knockback resistance” When compression of piston happens, temperature
increases, and can possibly cause premature explosion. This is how diesel engines work (minus the premature
part). Messes up piston cycle. Higher octane means greater tolerance for higher
temperature via higher pressure