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Engine Compression Systems

Learn about the compression systems in engines, including crankcase designs, valve arrangements, and overhead valve variations. Explore different engine types and configurations to understand how they impact performance and efficiency.

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Engine Compression Systems

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  1. Engine Compression Systems

  2. Definition • The compression system is often referred to as the heart of the energy converter (engine)

  3. Variations of crankcase designs • Vertical shaft-single cylinder • Horizontal shaft-single cylinder • Opposed • V-type • In-line

  4. Vertical Shaft single cylinder

  5. Horizontal Shaft Engine

  6. Opposed cylinder (boxer)

  7. V-type Engine

  8. In-line engine

  9. Valve Arangement • L-head • Valves are in the block of the engine • Overhead • Valves are over the top of the pistons • Provides greater air flow = a more efficient engine

  10. Overhead valve variations • Pushrod engine • Camshaft is in the engine block, valves are opened through a series of lifters, push rods, rocker arms • Overhead Cam (SOHC) • Camshaft is mounted in the cylinder head, valves can be directly pushed open by the cam lobes, rocker arms, or lifters, many variations exist.

  11. Overhead valves con’t • Dual overhead cam (DOHC) • 2 camshafts are mounted in the cylinder head • One camshaft operates the exhaust valves, one camshaft operates the intake valves. • Many variations exist here also.

  12. Valve number variations • 2 valves/cylinder –one exhaust, one intake • 3 valves/cylinder – two intake, one exhaust • 4 valves/cylinder-two intake, two exhaust • 5 valves/cylinder-three intake, two exhaust

  13. L-head engine

  14. Overhead valve

  15. Dual overhead cam

  16. Single overhead cam

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