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- Porsche 964 (911) TURBO 3.6L 1991-93
Genuine Porsche Piston Ring Set.
Sold each - 6 required per car
Fits
- Porsche 964 Turbo 3.6L 1993 (M64.50)
What This Product Does
Installed within the grooves around the piston, the rings form the working seal between the piston and cylinder. They retain combustion pressure, manage the lubricating-oil film and conduct heat away from the piston.
Functions
- Maintains the seal around the combustion chamber
- Regulates oil remaining on the cylinder surface
- Reduces gas blow-by into the crankcase
- Conducts heat from the piston towards the cylinder
Technical Details
- Part number: PCG50399N0
- Supply quantity: one ring set for one piston
- Size specification: standard
- Engine applications: M64.50
A complete six-cylinder engine normally requires six individual sets. Confirm the quantity needed for the planned rebuild before ordering.
Symptoms of Fault
- Rising engine-oil consumption
- Blue smoke from the exhaust under acceleration
- Low or inconsistent compression readings
- Increased crankcase pressure and blow-by
- Oil deposits on spark plugs
- Loss of power associated with poor cylinder sealing
Similar symptoms may be caused by worn cylinders, damaged pistons, valve-guide wear or crankcase-ventilation faults. Compression and leak-down testing should form part of the diagnosis.
Why Replacement Matters
Damaged, worn or seized rings can compromise compression and oil control. When rebuilding the engine, inspect the pistons, ring grooves and cylinder running surfaces for wear, scoring and dimensional accuracy. Cylinder condition, ring end gaps, installation direction and operating clearances must comply with the applicable Porsche workshop specifications.
FAQs
- Does one set cover the complete engine?
No. This product contains rings for one piston; six sets are generally required for the complete six-cylinder engine. - Are these oversized piston rings?
No. The supplied rings are standard size for a nominal 100 mm bore. - Should the cylinders be checked before fitting?
Yes. Measure each bore and inspect its surface finish to establish whether standard-size components remain suitable. - Can rings be renewed without inspecting the pistons?
No. The piston grooves, lands and related cylinder surfaces should be assessed as part of the rebuild.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG50399N0
The product you are viewing cross references to these numbers
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII Turbo 2010-13
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche Cayman GT4 3.8L 2015-16
6 sets per engine. Price is for 1 set.
Fits:
Porsche 997.2 3.8L 2009-2012 MA1.01 Engines
Porsche 997.2 Turbo 3.8L 2009-2012 MA1.70 Engines
Porsche 991 3.8L Carrera S MA1.03 Engines
Porsche 991 Turbo 3.8L
Porsche 987C Cayman GT4 2016
ø97 mm,
Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A110307502
The product you are viewing cross references to these numbers
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII Turbo 2010-13
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche Cayman GT4 3.8L 2015-16
6 sets per engine. Price is for 1 set.
Fits:
Porsche 997.2 3.8L 2009-2012 MA1.01 Engines
Porsche 997.2 Turbo 3.8L 2009-2012 MA1.70 Engines
Porsche 991 3.8L Carrera S MA1.03 Engines
Porsche 991 Turbo 3.8L
Porsche 987C Cayman GT4 2016
ø97 mm,
Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A110307502
The product you are viewing cross references to these numbers