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Engine Compression Systems

Engine Compression Systems. Definition. The compression system is often referred to as the heart of the energy converter (engine). Variations of crankcase designs. Vertical shaft-single cylinder Horizontal shaft-single cylinder Opposed V-type In-line. Vertical Shaft single cylinder.

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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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