2. Engine
• An engine or moto
r is
a machine designe
d to convert one
form
of energy into usefu
l mechanical
energy. Heat or
thermal engines,
like the internal
6. Comparative
analysis
• As far as efficiency goes, the 4-stroke certainly wins. This is due to the fact that fuel is consumed once every 4 strokes.
• Four-stroke engines are heavier; they weigh upwards of 50% more than a comparable 2stroke engine.
• Typically, a 2-stroke engine creates more torque at a higher RPM, while a 4-stroke engine creates a higher torque at a lower RPM.
• The 4-stroke engine is also much quieter, a 2-stoke engine is significantly louder and has a distinctive, high-pitched “buzzing” sound.
• Two-stroke engines are a much simpler design, making them easier to fix. They do not have valves, but rather ports. Four-stroke engines have more parts,
therefore they are more expensive and repairs cost more.
• Two-stroke engines require pre-mixing of oil and fuel, while the 4-strokes do not.
• Four-strokes are more environmentally friendly; in a 2-stroke engine, burnt oil is also released into the air with the exhaust.
8. Wankel
• The Wankel engine is a type of internal combustion
engine using an eccentric rotary design to convert pressure
into rotating motion.
• All parts of a rotary engine rotate in one direction.
9. Need for technology Shift
Thus, technologies have been developed for use in hybrid vehicles. These
utilize the benefits of electric motors and combustion for a more efficient car
with less fuel consumption and, consequently, with less gas emissions from
the combustion. To make this integration possible, one of the components that
