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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

Automotive Engines

Part 4 (Cyl. Head)

cylinder head1
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
iron heads
Iron Heads
  • Cheaper than Alu.
  • Better Tq. Due to heat retention
  • Better Sealing (same expansion rate as block)
  • Heavier
aluminum heads
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
cylinder head parts
Cylinder Head Parts
  • Ports
    • allows intake charge into combustion chamber, and exhaust out

Port

cylinder head parts1
Cylinder Head Parts
  • Sealing Surface – mating surface to block

Sealing Surface

cylinder head parts2
Cylinder Head Parts
  • Valve Guide – controls valve alignment
cylinder head parts3
Cylinder Head Parts
  • Combustion Chamber – where combustion occurs
  • Many shapes and sizes
combustion chamber styles
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.
combustion chamber styles1
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
combustion chamber styles2
Combustion Chamber Styles
  • Bathtub or Heart-shaped
    • any chamber that\'s not a wedge or hemispherical
    • Heart Or Kidney Shaped
port design
Port Design
  • Cross Flow
    • Intake & Exhaust ports on opposite sides of head
  • Reverse Flow
    • Intake & Exhaust ports on same side of head
cross flow
Cross Flow
  • Best flow
  • Cool intake charge
  • High HP

Intake

Exhaust

reverse flow
Reverse Flow
  • Pre-heating of intake charge
  • Exhaust under intake
  • Poor Flow
  • High torque

Intake

Exhaust

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