Piston ring set. Porsche 911 1967-68 2.0L  ❭  00891180R

Chrome Top Compression Rings.
Restore effective cylinder sealing and dependable compression during an engine rebuild with these OE Match Chrome Top Compression Rings, reference 00891180R. Designed for compatible engine applications, the compression rings fit into the piston ring grooves and form a critical seal between the pistons and cylinder walls.

Fits: Porsche 911 1967-68 2.0L
Ring size: 1.5x1.5x4.0
Number of CYL's: 6

The top compression ring operates closest to the combustion chamber and is exposed to particularly high combustion pressures and temperatures. Its primary purpose is to contain combustion gases above the piston, helping maintain cylinder pressure and preventing excessive gases from escaping into the crankcase. The ring also assists with transferring heat from the piston into the cylinder wall.  

What This Product Does:

• Create a combustion seal between the pistons and cylinder walls.
• Help retain combustion pressure within each cylinder.
• Support strong and consistent engine compression.
• Reduce combustion gases escaping into the crankcase.
• Help minimise excessive engine blow-by.
• Assist with transferring heat from the pistons into the cylinder walls.
• Provide a wear-resistant chrome running surface.
• Support efficient combustion and dependable engine performance.
• Replace worn, damaged, broken, or sticking compression rings.
• Provide an OE-style replacement for compatible engine rebuilds.

Symptoms Of Wear Or Failure:

• Low or uneven cylinder compression.
• Excessive crankcase pressure or blow-by.
• Reduced engine power or acceleration.
• Poor overall engine performance.
• Increased oil consumption.
• Blue or blue-grey exhaust smoke.
• Increased exhaust emissions.
• Oil-fouled spark plugs.
• Poor compression or leak-down test results.
• Excessive carbon deposits in the combustion chambers.
• Broken, worn, seized, or damaged compression rings during disassembly.
• Excessive wear of the piston ring grooves or cylinder bores.

Why Replacement Matters:

• Top compression rings are essential for containing the high pressures generated during combustion. As the rings and their running surfaces wear, the seal between the piston and cylinder wall can deteriorate, allowing combustion gases to pass into the crankcase. This can reduce compression, decrease engine performance, and increase blow-by.
• A damaged or broken compression ring may also score the cylinder wall or damage the piston ring groove. Continued operation can therefore turn a ring-related problem into a more extensive engine repair involving pistons, cylinders, or other internal components.
• Correct installation is particularly important with replacement compression rings. The piston ring grooves, cylinder bore diameter, taper, ovality, and surface finish should be inspected and measured. Ring end gap and side clearance must also be checked against the correct engine specifications. The cylinder preparation required for chrome-faced rings should be appropriate to the ring manufacturer's specifications to promote correct bedding and sealing.
• Replacing worn or damaged components with these OE Match Chrome Top Compression Rings 00891180R helps restore combustion sealing, cylinder compression, and dependable engine performance when installed as part of a correctly measured and prepared engine rebuild.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

00891180R

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