Millennium Cylinder - Lycoming O-320 Series - SL32006W-A21P

Each Complete New Millennium Cylinder Assembly contains all of the following new parts: head, barrel, valves, valve seats, valve guides, piston, rings, gasket kit, seals, springs, rotocoils, rocker shafts, and rocker cover (they will not include piston pins or rocker arms).

 
Fits engines:

• O-320 A, C, E
• IO-320 E
• AEIO-320 E

Features Unique to All Models for Lycoming Engines

Improved Casting Integrity

• Castings meet stringent porosity and shrinkage requirements.
• Promotes a longer-life cylinder head, less prone to cracking.

Computer Generated Cylinder Head Fin Configuration

• More consistent fin thickness and spacing.
• Means more uniform heat transfer and fewer "hot spots", compared to standard competitors cylinders.

New Materials

• Advanced alloys yield 20% greater strength than aerospace industry standards for air-cooled cylinder heads.
• Increases cylinder longevity.

Through hardened 6382 Steel Cylinder Barrel

• Uniform hardness at any depth with more corrosion resistance.
• These barrels may be ground oversize and fitted with oversized pistons.

Choked barrel

• Optimal barrel choke allows rings and pistons to work properly at normal operating temperatures.
• Improves performance and reduces ring and piston wear.

Features Unique to Lycoming 320/360/540 Parallel Head Engines

Increased Wall Thickness and Enlarged Spark Plug Boss

• Exhaust wall thickness has been increased and spark plug boss has been enlarged to reduce premature warping and cracking.
  
  First Production Investment-Cast Aircraft Cylinder for Improved Integrity
• The Millennium parallel head 320/360/540 cylinder castings have a smoother finish for better cooling and improved volumetric efficiency in the ports.

Casting Integrity

• Smoother surface finish allows better heat transfer.
• Dimensional consistency improves durability.
• A denser raw material with fewer inherent voids and cavities resists cracking.

Improved Port Design

• 6% better volumetric efficiency
• Smoother port walls reduce drag

Features Unique to Lycoming 540 Upexhaust Engines

      Increased Thickness in Combustion Chamber Walls & Exhaust Port

• Translates into a longer-life cylinder head, less prone to cracking.

*Application information is provided for reference only. Make sure to refer to the applicable airframe/engine manufacturer's manual for exact application information.