1. Different Types of IC Engine Rated by their maximum horsepower Three Types –Reciprocating –Rotary –Sustained Combustion

2. 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

3. 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

4. Rotary Engine Working Model

5. 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.

6. 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

7. 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

8. Rotary Engine Parts a disk that looks like a triangle Intake and exhaust are through ports in the flat sides of the cylinder

9. 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

10. Compression Ratio Efficiency Knocking

11. 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

12. Cooling System Air Cooled, Natural or Fan Water Cooling, –Thermostat keeps water away during heat up

13. 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

14. 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)