Automotive engines
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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

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Automotive engines

Automotive Engines

Part 4 (Cyl. Head)


Cylinder head

Cylinder 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.


Hemispherical or pentroof the hemi

Hemispherical or Pentroof - The "Hemi"


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


Wedge shaped chambers

Wedge-Shaped Chambers


Combustion chamber styles2

Combustion Chamber Styles

  • Bathtub or Heart-shaped

    • any chamber that's not a wedge or hemispherical

    • Heart Or Kidney Shaped


Bathtub or heart shaped

Bathtub or Heart-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


The end

The End


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