Piston Rings

• Purpose:• Seal to prevent loss of compression

pressure• Transfer heat of combustion to cylinder

walls• Support/guide piston in bore

Piston Rings

Piston Rings

•Construction Materials• Cast Iron• Steel

• Coatings• Porous Chrome• Molybdenum • Black Oxide

Piston Rings

Top

Middle

Bottom

Compression

Napier

Oil Control

Piston Rings - Compression

• Rectangular

Piston Rings - Compression

• Taper Face

Piston Rings - Compression

• Internally Beveled

Piston Rings - Compression

• Internally Stepped

Piston Rings - Compression

• Internal Bevel Reverse Twist

Piston Rings – Napier

• Napier

Piston Rings - Napier

• Taper Faced Napier

Piston Rings – Oil Control

• Slotted

Piston Rings – Oil Control

• Expander Spring Backed

Piston Rings – Oil Control

• Coil Spring Loaded - Slotted

Piston Rings – Oil Control

• Coil Spring Loaded - Beveled

Piston Rings – Oil Control

• Coil Spring Loaded – Double Beveled

Piston Rings – Oil Control

• Coil Spring Loaded – Beveled Edge, Chrome Plated

Piston Rings – Oil Control

• Expander/Segment

Piston Rings – Design/Function

• Tangential Pressure

Piston Rings – Comp Ring Seal

Piston Rings – Comp Ring Seal

• Gas Ports

Piston Rings

• Typical Ring Package

Piston Rings

• Typical Ring Package

Piston Rings – Break-in

• Cylinder bore finish (honed) at 1000X