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Different Types of IC Engine

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					  Different Types of IC Engine
• Rated by their maximum horsepower

• Three Types
  – Reciprocating
  – Rotary
  – Sustained Combustion
                Reciprocating
• Four Stroke
  – Most Widely Used
  – the four process in two cycles of piston motion.
• Two Stroke
  – All 4 processes take place in a single stroke
• Five and Six Stroke
  – 5 stroke adds refrigeration cycle (improved efficiency)
  – 6 stroke two types
Rotary Engine (Wankel Engine)
• Do not have pistons,
• Contains an oval housing and
  a triangular rotor.
• The engine phases occur in
  the spaces between the rotor
  surfaces and the housing.
• Directly generates rotary
  motion of the rotor
• Being Used in Automobiles,
  Racing Cars, and Go Karts
Rotary Engine Working Model
           Sustained Engine
• processes occur in different portions of the
  engine simultaneously
• Two Types
  – Gas Turbine
     • dedicated components
     • Continuous power output
     • Minor applications
  – Jet Propulsion
     • Expel the expanded gas from the compression
       process through a nozzle to create thrust.
                 Reciprocating
• Arrangement of Cylinders
  –   Inline
  –   Flat
  –   V shape
  –   W Engine

• Working Principle
• Speed of Engine
• Head
  – Covers Cylinders
  – Threaded to fit in the Spark Plug
    Reciprocating Engine Parts

• Ports
  – Intake Port
  – Exhaust Ports
• Valves
• Camshaft
  – rotates at one-half engine speed
  – opens the valves in correct sequence
• Carburetor or Injector
  – Mixes air fuel mixture
• Exhaust Pipe and Muffler
        Rotary Engine Parts
• a disk that looks like a triangle
• Intake and exhaust are through ports in
  the flat sides of the cylinder
                      Comparison
Advantage
• 48% fewer parts and about a third the bulk and weight of a
  reciprocating engine.
• Pollution control devices are easier to install
• Higher rotating speed is achievable
• Twice more efficient than piston ones

Disadvantage
• lack of torque at low speeds, leading to greater fuel consumption.
• Complicated seal system
• Low intake time
• 50% longer stroke duration
• Higher Manufacuring Costs
• Compression Ratio
• Efficiency
• Knocking
           2 Stroke Engine
• delivers one power stroke every two
  strokes instead of one every four
• develops more power with the same
  displacement
• heats up more, thus have a shorter life
• lubricating oil must be mixed with the fuel
  causing high pollutants unless
  computerized
           Cooling System
• Air Cooled, Natural or Fan
• Water Cooling,
  – Thermostat keeps water away during heat up
               Lubrication
• lubricated by oil from a separate oil
  reservoir
• a gear pump delivers the oil at low
  pressure to the bearings
• In a two-stroke engine the lubricating oil is
  mixed with the fuel
         Emission Control
• US Regulation
• Some Exhaust gas send back to cut down
  temperature and production of NOx
• Lean Mixture
• Catalytic Convertors
• Variable Valve Timing (Thru Solenoids)

				
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posted:2/12/2012
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