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Oil Pressure Relief Valve
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Kit Includes
Piston x 2
Spring - long x 1
Spring - short x 1
Guide sleeve x 1
Sealing washer x 2
Screw plug x 2
Fits:
Porsche 911 - 1970 to 1978 - When oil pressure bypass mod carried out
Porsche 911 / 930 - 1978 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110751200KIT
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 914 (1970-1976)
Tolerance between the pressure relief plug and its galley are very close, and the slightest bit of gunk, corrosion, or bur will cause the plug to freeze up in the oil passage. A magnet is rarely powerful enough to overcome the seized plug, and leaving it in place is never an option.
Using STOMSKI RACING's Oil Pressure Relief Plug Extractor makes the task of removing the stuck plug a breeze, and allows you to ensure clean oil passages, and a properly operating bypass system.
The collet-based tool slides easily into the open end of the seized plug and a simple turn or two of the internal socket head cap screw expands the tool, grasping the plug to ensure easy removal.
Anodized Aluminum.
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Fits:
Porsche 356B / 356C
Porsche 912
Porsche 911 65-77
Porsche 914
Diagram ref no 54
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906401002
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 911 / 930 1971-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo/GT2 2001-05
Porsche 997 Turbo/GT2/GT2 RS 2005-12
Porsche 996 GT3 / 997 GT3 1999>>
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906402601
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 911 / 930 1971-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo/GT2 2001-05
Porsche 997 Turbo/GT2/GT2 RS 2005-12
Porsche 996 GT3 / 997 GT3 1999>>
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906402601
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 914 (1970-1976)
Porsche Oil Pressure Relief Valve
The oil pressure relief valve 90110728520 is an important
component in the lubrication system of classic high-performance Porsche
engines. Used in racing and motorsport-derived models such as the Porsche 911
RSR 2.8, 911 RSR 3.0 and Porsche 914-6 GT, this valve helps regulate oil
pressure to ensure safe and consistent engine lubrication.
Fits:
These engines were developed for high-performance and competition use, where maintaining stable oil pressure is critical to protecting internal engine components during high RPM operation.
What the Oil Pressure Relief Valve Does
The oil pressure relief valve regulates pressure within the engine’s lubrication system. As oil is pumped through the engine, pressure builds within the system. If the pressure exceeds a predetermined level, the relief valve opens to divert excess oil back into the system.
This process helps:
• Maintain stable oil pressure throughout the engine
• Prevent excessive pressure that could damage seals and gaskets
• Protect oil coolers and lubrication channels
• Ensure proper lubrication during high RPM operation
• Maintain reliability in high-performance engines
Without a properly functioning relief valve, oil pressure can rise beyond safe levels, increasing the risk of component failure.
Why Oil Pressure Relief Valves Fail
Over time, oil pressure relief valves can wear or become contaminated with debris from the lubrication system.
Common causes of failure include:
Internal wear
Continuous operation under high pressure can wear the internal spring or valve
seat.
Contamination
Debris or sludge in the oil system can cause the valve to stick or operate
incorrectly.
Spring fatigue
The internal spring that controls opening pressure can weaken with age.
Improper oil maintenance
Old or contaminated oil can accelerate internal wear of lubrication system
components.
Symptoms of a Faulty Oil Pressure Relief Valve
• Unstable or fluctuating oil pressure readings
• Excessively high oil pressure
• Oil leaks caused by excessive pressure
• Reduced lubrication efficiency in extreme conditions
• Potential damage to seals, oil coolers or engine components
Replacing a worn relief valve helps maintain correct oil pressure and protects valuable engine components.
Why You May Need to Replace This Valve
Protect High-Performance Porsche Engines
RSR and GT engines operate under demanding conditions where stable oil pressure
is critical.
Maintain Correct Oil System Operation
A properly functioning valve ensures the lubrication system operates within
safe pressure limits.
Prevent Engine Damage
Excessive oil pressure can damage seals, oil coolers and internal components.
Ideal for Engine Rebuilds or Restorations
When rebuilding or restoring classic Porsche racing engines, replacing critical
oil system components ensures long-term reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110728520
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
This kit comes with the correct Spring pressure and with the correct size piston. CNC machined and zinc plated
Fits:
Porsche 911 - 1972 to 1978
Diagram ref no 25, 26, 27 and 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110751220S
The product you are viewing cross references to these numbers
An oil pressure relief valve is a critical engine component designed to regulate and maintain optimal oil pressure within your vehicle’s lubrication system. By controlling excess oil pressure and redirecting flow when necessary, this valve helps prevent engine damage, reduces wear on internal components, and ensures consistent lubrication under all driving conditions.
At Design911, we supply a comprehensive range of high-quality oil pressure relief valves engineered for performance, durability, and precise pressure control. Suitable for a wide range of vehicles, including performance and Porsche applications, these valves are essential for maintaining engine reliability, especially under high load, high RPM, or track driving conditions.
Whether you're replacing a worn valve, upgrading for improved oil system efficiency, or maintaining your engine for long-term reliability, our range includes OEM and performance-grade oil pressure relief valves designed to meet or exceed manufacturer specifications.