BASIC MECHANICAL ENGINEERING. INTERNAL COMBUSTION ENGINES.
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Transcript of BASIC MECHANICAL ENGINEERING. INTERNAL COMBUSTION ENGINES.
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BASIC MECHANICAL BASIC MECHANICAL ENGINEERINGENGINEERING
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INTERNAL INTERNAL COMBUSTION COMBUSTION
ENGINESENGINES
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Four Stroke Cycle – Otto Four Stroke Cycle – Otto CycleCycle
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Four Stroke Cycle – Otto Four Stroke Cycle – Otto CycleCycle
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Starting position, intake stroke, and compression stroke.
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Ignition of fuel, power stroke, and exhaust stroke.
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Four Stroke Cycle – Diesel Four Stroke Cycle – Diesel CycleCycle
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Four Stroke Cycle – Diesel Four Stroke Cycle – Diesel CycleCycle
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Two Stroke Cycle – Otto Two Stroke Cycle – Otto CycleCycle
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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
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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.
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Fuel Supply – Fuel injection Fuel Supply – Fuel injection in Diesel Enginesin Diesel Engines
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Fuel Supply - Carburetion in Fuel Supply - Carburetion in Petrol EnginesPetrol Engines
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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
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MPFI EngineMPFI Engine
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MPFI EngineMPFI Engine