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Reciprocating Engine Review

Reciprocating Engine Review. Back to School – Spring Break is Over!. Reciprocating Engines. Mechanical System. Cylinder Known as the engine’s combustion chamber Where the power is developed. Mechanical System. Piston

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Reciprocating Engine Review

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  1. ReciprocatingEngine Review Back to School – Spring Break is Over!

  2. Reciprocating Engines

  3. Mechanical System • Cylinder • Known as the engine’s combustion chamber • Where the power is developed

  4. Mechanical System • Piston • Fits snugly in the hollow cylinder allowing up-and-down linear (straight) motion • Fit will not allow air or fluid in the cylinder

  5. Mechanical System • Crankshaft • The crankshaft and connecting rod allow for the movement of the propeller.

  6. Mechanical System • Connecting Rod • Attached to the throws • With the crankshaft, they change the direction of the pistons into a circular motion

  7. Mechanical System • Valves • A rocker arm regulates the opening and closing of each valve. • Lobes or rings on a camshaft push the rocker arm

  8. Spark Plug • Internal combustion engines are • spark-ignition engines, which require spark plugs to begin combustion, and • compression-ignition engines (diesel engines), which compress the air and then inject diesel fuel into the heated compressed air mixture where it auto-ignites.

  9. Mechanical System • Cylinder • Piston • Crankshaft • Connecting Rod • Valves • Spark plug

  10. Mechanical System

  11. Four-Stroke Cycle • Occurs at the same time in all cylinders, but not on the same step • Ignition sequence of the cylinders called the firing order

  12. Four-Stroke Cycle

  13. Types of Reciprocating Engines • How to get more horsepower from an engine? • (1) Increase the number of cylinders or (2) Increase the size of each cylinder • Attention focused on designs

  14. Types of Reciprocating Engines • In-line Engines • Cylinders are located in a row, one • behind the other • Two classifications: • Upright • Inverted

  15. Types of Reciprocating Engines • Opposed Engines • Two rows or banks of cylinders on each side of the crankshaft • Rows directly opposite each other called horizontal opposed

  16. Types of Reciprocating Engines • V and X Engine • “V” engine features two rows of cylinders set • at an angle of about 45° • The “X” engine is essentially an opposed “V” • engine

  17. Types of Reciprocating Engines • Radial Engine • Crankshaft with only • one throw • Odd number of • cylinders in each bank • or row • Maximum number of • cylinders in each bank • is nine

  18. Radial Engine

  19. Construction of Reciprocating Engines

  20. Fuels Used in Reciprocating Engines • Most common form of • fuels is hydrocarbons • derived from petroleum • Gasoline and kerosene • offer several advantages • Mix easy with air • Low flash point • High heat content - power

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