AMT 212 WEEK 1 PPT 2 Flashcards
require only one upstroke and
one down stroke of the piston
to complete the series of
events.
The engine completes the
operating cycle in one
revolution of the crankshaft
Two stroke cycle
Two complete revolutions of the
crankshaft (720°) are required for
the four strokes; thus, each cylinder
in an engine of this type fires once
in every two revolutions of the
crankshaft.
Four Stroke Cycle
_____ engines work by compressing
only the air.
Diesel Cycle
This increases the air temperature
inside the cylinder to such a high
degree that atomized diesel fuel
injected into the combustion chamber
and ignites spontaneously.
Diesel cycle
The diesel engine is named after its
originator______
Rudolf Diesel
is a type of internal
combustion engine using an eccentric rotary
design or a rotor with a shape similar to a
Reuleaux Triangle to convert pressure into
rotating motion.
Rotary engine cycle
Rotary engine can be also called
Wankel Engine
inventor
of a rotary engine Wankel reportedly came
up with the basic idea for a new type of
internal combustion gasoline engine when
he was only 17 years old.
The German engineer Felix Wankel
Ideally, it is assumed that ignition
occurs at TDC.
There is a time lag between the
spark and actual.
Ignition Timing
To supply more amount of
fuel and air mixture inside
the cylinder, completely
clearing out exhaust
gasses from the cylinder is
required.
Earlier opening of the
exhaust valve before the
piston reaches BTC to TDC
facilitates the removal of
the burn gasses.
Exhaust valve timing
Four stroke valve timing
TDC - Top Dead Center
BDC- Bottom Dead Center
Valve Lead - is when the
valve opens BEFORE the
IDEAL opening time
Valve lag – is when the
valve remains open
AFTER the IDEAL closing
time.
Valve overlap – both
valves open.
