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Automotive Engines

Automotive Engines. Part 4 (Cyl. Head). Cylinder Head. Cylinder Head. A cylinder head is a casting generally made out of iron or aluminum Allows Fuel & Air in Allows Exhaust Out Holds the valves, valve springs and retainers and one or two camshafts (overhead cam engines only).

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Automotive Engines

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  1. Automotive Engines Part 4 (Cyl. Head)

  2. Cylinder Head

  3. Cylinder Head • A cylinder head is a casting generally made out of iron or aluminum • Allows Fuel & Air in • Allows Exhaust Out • Holds the valves, valve springs and retainers and one or two camshafts (overhead cam engines only). • May also allow for acc. mounting

  4. Iron Heads • Cheaper than Alu. • Better Tq. Due to heat retention • Better Sealing (same expansion rate as block) • Heavier

  5. Aluminum Heads • More Expensive than iron • Higher HP due to better heat transfer • Can go at least 1 pt. higher CR • Can be up to 40lbs. lighter

  6. Cylinder Head Parts • Ports • allows intake charge into combustion chamber, and exhaust out Port

  7. Cylinder Head Parts • Sealing Surface – mating surface to block Sealing Surface

  8. Cylinder Head Parts • Valve Guide – controls valve alignment

  9. Cylinder Head Parts • Combustion Chamber – where combustion occurs • Many shapes and sizes

  10. Combustion Chamber Styles • Hemispherical or Pentroof - The "Hemi" • A hemispherical combustion chamber is one half of a sphere cast into the bottom of the cylinder head. • The valves are placed at the outside of the bore area and at a specific angle from the crankshaft centerline.

  11. Hemispherical or Pentroof - The "Hemi"

  12. Combustion Chamber Styles • Wedge-Shaped Chambers • Inclined basin recessed into the deck of the head • Steep walls in such chamber design force the air/fuel flow path and deflect and force it to move in a downward spiral around the cylinder axis

  13. Wedge-Shaped Chambers

  14. Combustion Chamber Styles • Bathtub or Heart-shaped • any chamber that's not a wedge or hemispherical • Heart Or Kidney Shaped

  15. Bathtub or Heart-shaped

  16. Port Design • Cross Flow • Intake & Exhaust ports on opposite sides of head • Reverse Flow • Intake & Exhaust ports on same side of head

  17. Cross Flow • Best flow • Cool intake charge • High HP Intake Exhaust

  18. Reverse Flow • Pre-heating of intake charge • Exhaust under intake • Poor Flow • High torque Intake Exhaust

  19. The End

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