Piston ring set. Porsche 914 1.7 / 1.8L Big Bore  ❭  VW10

Piston Ring Set.
Restore effective cylinder sealing, compression, and oil control during an engine rebuild with this OE Match Piston Ring Set, available under references VW103T4R and VW104T4R. Designed for compatible VW engine applications, these piston rings fit into the machined grooves around each piston and form the critical sealing interface between the piston and cylinder wall.

Fits: Porsche 914 2.0L
Ring size: 1/16 x 1/16 x 3/16
Number of CYL's: 4

This is a replacement ring Set for the 103x71mm Retro Performance pistons.

Piston rings perform several essential functions inside the engine. The compression rings help contain combustion pressure above the piston, minimising the amount of combustion gas that escapes into the crankcase. The oil-control rings regulate the lubricating oil film on the cylinder walls, removing excess oil while retaining sufficient lubrication for smooth piston movement. The rings also help transfer heat from the pistons into the cylinder walls.  

What This Product Does:

• Creates an effective seal between the pistons and cylinder walls.
• Helps retain combustion pressure within each cylinder.
• Supports strong and consistent engine compression.
• Reduces combustion gas leakage into the crankcase.
• Helps minimise excessive engine blow-by.
• Controls the lubricating oil film on the cylinder walls.
• Helps prevent excessive engine oil from entering the combustion chambers.
• Assists with transferring piston heat into the cylinder walls.
• Supports efficient combustion and dependable engine performance.
• Replaces worn, damaged, broken, or sticking piston rings.

Symptoms Of Wear Or Failure:

• Low or uneven cylinder compression.
• Excessive engine oil consumption.
• Blue or blue-grey smoke from the exhaust.
• Excessive crankcase pressure or blow-by.
• Reduced engine power or poor acceleration.
• Increased exhaust emissions.
• Oil-fouled spark plugs.
• Carbon deposits within the combustion chambers.
• Poor compression or leak-down test results.
• Excessive oil entering the combustion chambers.
• Broken, worn, seized, or damaged rings found during engine disassembly.
• Excessive cylinder bore or piston ring-groove wear.

Why Replacement Matters:

• Piston rings are essential for maintaining the cylinder seal required for efficient compression and combustion. When the rings become worn, damaged, stuck, or lose their tension, combustion gases can escape past the pistons into the crankcase. This reduces cylinder sealing and can lead to lower compression, reduced engine performance, and excessive blow-by.
• Worn oil-control rings can allow excessive lubricating oil to enter the combustion chambers. This may result in increased oil consumption, blue exhaust smoke, spark plug fouling, carbon deposits, and increased emissions. Continued operation with poor ring sealing can also accelerate wear of the pistons, cylinders, and other internal engine components.
• Correct ring selection and installation are particularly important during an engine rebuild. Incorrect ring dimensions, excessive end gaps, insufficient end gaps, worn piston grooves, or unsuitable cylinder surface finish can prevent the rings from sealing correctly. In severe cases, incorrect clearances can lead to ring breakage, piston damage, or cylinder scoring.
• Replacing worn or damaged components with the correct OE Match Piston Ring Set – VW103T4R or VW104T4R helps restore cylinder sealing, compression, oil control, and dependable engine performance when installed as part of a correctly measured and prepared engine rebuild.