basic mechanical engineering. internal combustion engines
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BASIC MECHANICAL BASIC MECHANICAL ENGINEERINGENGINEERING
INTERNAL INTERNAL COMBUSTION COMBUSTION
ENGINESENGINES
Four Stroke Cycle – Otto Four Stroke Cycle – Otto CycleCycle
Four Stroke Cycle – Otto Four Stroke Cycle – Otto CycleCycle
Starting position, intake stroke, and compression stroke.
Ignition of fuel, power stroke, and exhaust stroke.
Four Stroke Cycle – Diesel Four Stroke Cycle – Diesel CycleCycle
Four Stroke Cycle – Diesel Four Stroke Cycle – Diesel CycleCycle
Two Stroke Cycle – Otto Two Stroke Cycle – Otto CycleCycle
Comparison of 4 - stroke & Comparison of 4 - stroke & 2 - stroke Engines2 - stroke Engines
• To produce same power 2 stroke To produce same power 2 stroke
cycle engine will be of less weight cycle engine will be of less weight
and spaceand space
• More uniform turning moment in 2 More uniform turning moment in 2
stroke cycle engine stroke cycle engine
• Since no valve in 2 stroke cycle Since no valve in 2 stroke cycle
engine more mechanical efficiency, engine more mechanical efficiency,
simple construction, low initial cost, simple construction, low initial cost,
power saving…power saving…
• Fuel consumption is increased in 2 Fuel consumption is increased in 2
stroke cycle engine stroke cycle engine
Comparison of 4 - stroke & Comparison of 4 - stroke & 2 - stroke Engines2 - stroke Engines
• Two-stroke engines don't last nearly as Two-stroke engines don't last nearly as
long as four-stroke engines due to the long as four-stroke engines due to the
lack of a dedicated lubrication system.lack of a dedicated lubrication system.
• Two-stroke engines produce a lot of Two-stroke engines produce a lot of
pollution due to the combustion of the pollution due to the combustion of the
oil and due to the fact that each time a oil and due to the fact that each time a
new charge of air/fuel is loaded into new charge of air/fuel is loaded into
the combustion chamber, part of it the combustion chamber, part of it
leaks out through the exhaust port.leaks out through the exhaust port.
Fuel Supply – Fuel injection Fuel Supply – Fuel injection in Diesel Enginesin Diesel Engines
Fuel Supply - Carburetion in Fuel Supply - Carburetion in Petrol EnginesPetrol Engines
Different Systems in IC Different Systems in IC EnginesEngines
• Ignition System in Petrol EnginesIgnition System in Petrol Engines
• Cooling System in IC EnginesCooling System in IC Engines
• Lubrication System in IC EnginesLubrication System in IC Engines
– Splash MethodSplash Method
– Pressure feed MethodPressure feed Method
– Properties of Lubricants: Viscosity, Not Properties of Lubricants: Viscosity, Not
vaporizing at operating temperature vaporizing at operating temperature
range, High specific heat, Good cohesive range, High specific heat, Good cohesive
and adhesive qualitiesand adhesive qualities
MPFI EngineMPFI Engine
MPFI EngineMPFI Engine