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Porsche // Cayenne 9PA (955) 2003-2006 // 955 Cayenne Turbo S 4.5L 2006>>
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- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
The Genuine Porsche Inlet Valve, 41mm (Part Number: 99710511190) is an original equipment engine cylinder head component designed for selected Porsche 911 GT3 and GT3 RS models, including the 997-generation 3.6L, 3.8L and 4.0L naturally aspirated flat-six engines.
Sold Each.
x12 Required Per Car.
Fits:
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
Diagram Ref No 2
Manufactured to Porsche's original equipment specifications, this precision-engineered inlet valve forms part of the engine's cylinder head and valvetrain assembly. Its primary purpose is to control the admission of fresh intake air into the combustion chamber at precisely timed intervals.
Featuring a 41mm valve head diameter, the component is designed for Porsche's high-performance GT engines, where accurate valve operation is essential for maintaining efficient cylinder filling, combustion performance and reliable high-RPM operation.
During engine operation, the inlet valve opens to allow fresh air to enter the combustion chamber and closes to create the necessary seal during compression and combustion. Its movement is controlled by the camshaft and associated valvetrain components.
The Porsche GT3 and GT3 RS engines operate at exceptionally high engine speeds, placing significant demands on their valves, valve springs, guides and sealing surfaces. The inlet valve must withstand repeated mechanical loading, rapid opening and closing cycles and elevated operating temperatures.
Over time, an inlet valve may become worn, bent, damaged or unable to seal correctly because of valve seat deterioration, carbon deposits, overheating or mechanical problems within the valvetrain.
A damaged inlet valve can reduce cylinder compression, disturb combustion and cause rough running, misfires or loss of engine performance.
Replacing a defective inlet valve with a Genuine Porsche component helps restore correct valve operation, maintain cylinder sealing and protect the engine from further mechanical damage.
Ideal for cylinder head repairs, engine rebuilding, valve replacement and specialist Porsche GT engine maintenance, this Genuine Porsche 41mm Inlet Valve provides a factory-specified replacement for compatible applications.
What This Product Does:
The inlet valve is a critical component of the engine's four-stroke combustion cycle.
Its primary function is to control the flow of fresh intake air into the combustion chamber while maintaining a secure seal when the valve is closed.
As the piston moves through the intake stroke, the inlet valve opens at the correct point in the engine cycle to allow air to enter the cylinder.
The valve then closes as required by the camshaft timing, enabling the cylinder to develop compression before combustion.
The 41mm valve head is designed to provide the intended airflow and sealing characteristics for the relevant Porsche GT engine cylinder head.
Its main functions include:
- Controlling intake airflow: Opens to allow fresh air to enter the combustion chamber.
- Maintaining cylinder compression: Closes against the valve seat to provide the seal required for compression and combustion.
- Supporting efficient cylinder filling: Helps the engine receive the correct volume of intake air according to its design and operating conditions.
- Maintaining combustion efficiency: Supports the controlled intake and compression processes required for normal combustion.
- Supporting engine performance: Contributes to the airflow characteristics required by Porsche's naturally aspirated high-performance engines.
- Enabling high-RPM operation: Operates as part of a precision valvetrain designed for demanding engine speeds.
- Working with the camshaft: Opens and closes according to the engine's specified valve timing.
- Supporting smooth engine operation: Correct valve seating helps maintain consistent compression and combustion between cylinders.
- Preserving original engine specifications: Maintains the intended inlet valve dimensions and configuration.
The inlet valve is a mechanical engine component. It does not independently control fuel injection, ignition timing or electronic engine management.
Symptoms Of Wear Or Failure:
Inlet valves are subjected to repeated opening and closing cycles, elevated temperatures, valve spring pressure and mechanical contact with their seats and guides.
Although designed for demanding engine operation, damage or deterioration can occur through excessive wear, overheating, poor lubrication of related valvetrain components or mechanical interference.
Common symptoms of a worn or damaged inlet valve include:
- Loss of engine compression: A burnt, bent or poorly seated inlet valve may prevent the cylinder from sealing correctly.
- Engine misfires: Reduced compression or poor valve sealing can cause inconsistent combustion in the affected cylinder.
- Rough engine idling: Uneven cylinder performance may result in unstable or irregular idle operation.
- Reduced engine power: Poor cylinder filling or compression loss may affect engine performance.
- Hesitation during acceleration: A cylinder affected by valve damage may not produce its expected power output.
- Difficulty starting: Significant compression loss may make the engine harder to start.
- Abnormal valvetrain noises: Damage to associated valve springs, guides or operating components may produce unusual mechanical noise.
- Excessive valve guide wear: A worn guide may allow excessive valve movement and compromise correct seating.
- Bent valve stem: Mechanical interference or incorrect valve timing can deform the valve and prevent proper closure.
- Damaged valve head or seating surface: Pitting, burning or impact damage may reduce sealing effectiveness.
- Increased oil consumption: Worn valve guides or stem seals may allow oil to enter the intake port and combustion chamber.
- Blue exhaust smoke: Oil entering the combustion chamber through damaged valve guide or seal arrangements may produce blue smoke.
- Check engine warning: Cylinder misfires caused by compression problems may trigger engine management fault codes.
- Poor cylinder leak-down test results: Air escaping through the intake port during testing may indicate an inlet valve sealing problem.
- Visible damage during cylinder head inspection: Cracks, deformation, excessive stem wear or damaged seating surfaces may indicate replacement is necessary.
Why Replacement Matters:
Replacing a defective inlet valve is essential for restoring correct cylinder sealing, maintaining engine compression and preserving the performance of Porsche's high-revving GT engines.
A valve that does not seal correctly may allow compressed air to escape from the combustion chamber, reducing the efficiency of the combustion process.
A bent, cracked or otherwise weakened inlet valve can also represent a serious mechanical risk, particularly when the engine is operated at high RPM.
If a valve fails completely, fragments may damage the piston, cylinder head or other internal engine components.
Installing a Genuine Porsche replacement Inlet Valve helps to:
- Restore cylinder compression: Replace damaged sealing surfaces and restore the intended valve-to-seat contact.
- Improve combustion consistency: Help eliminate irregular combustion caused by a confirmed valve sealing fault.
- Restore engine performance: Support correct intake airflow and cylinder operation.
- Reduce engine misfires: Address misfires caused by a leaking or damaged inlet valve.
- Maintain high-RPM reliability: Replace mechanically compromised components before further deterioration.
- Protect internal engine components: Reduce the risk of damage associated with a weakened or fractured valve.
- Restore correct valvetrain operation: Maintain the intended interaction between the valve, guide, spring and camshaft-driven components.
- Support cylinder head repairs: Provide the correct replacement part during specialist head refurbishment.
- Maintain original airflow characteristics: Preserve the specified 41mm inlet valve dimensions.
- Preserve factory engine specifications: Use a valve designed for the relevant Porsche GT engine.
- Support engine rebuilding: Replace damaged or worn valves during an engine overhaul.
- Improve long-term engine reliability: Address mechanical wear before it causes additional cylinder head or piston damage.
- Maintain Genuine Porsche quality: Use an original equipment component intended for the applicable engine configuration.
Replacement is particularly recommended when inspection confirms valve deformation, cracking, excessive stem wear, damaged seating surfaces or an inability to maintain proper cylinder compression.
When replacing an inlet valve, the valve guide, seat, spring, stem seal, retainers and associated valvetrain components should also be inspected.
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99710511190
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Porsche 987.2 Boxster(24 per car)
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Porsche 981C Cayman (24 per car)
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Porsche 997.1 2005-08
Porsche 997.2 2009-12
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Porsche 991.2 2017-19 (24 per car)
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Porsche Cayenne 92A Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
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Porsche Cayenne 92A Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
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Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510567500
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
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The OE Match Engine Cylinder Head Inlet Valve is a precision replacement valvetrain component for Porsche Cayenne 955 4.5L V8 engines. It controls the flow of intake air and fuel into the combustion chamber and provides an essential seal against the valve seat when closed.
Fits:- Porsche 955 Cayenne S 4.5L 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
Diagram Ref No 3
During the intake stroke, the valve opens to allow the cylinder to fill with the intake charge. It then closes securely against the valve seat so the combustion chamber can build and retain the compression required for efficient combustion.
Correct inlet valve condition, alignment and seating are essential for effective cylinder filling, consistent compression, smooth engine operation and dependable performance.
What This Product Does:
- Controls the flow of intake air and fuel into the combustion chamber.
- Opens during the intake stroke to allow efficient cylinder filling.
- Closes against the valve seat to seal the combustion chamber.
- Helps maintain correct cylinder compression.
- Supports efficient combustion and engine performance.
- Helps maintain smooth idle and consistent power delivery.
- Contributes to responsive acceleration and throttle response.
- Works with the valve guide, valve seat, valve spring and associated valvetrain components.
- Replaces an inlet valve that has become bent, pitted, burnt or excessively worn.
- Helps restore correct cylinder-head operation during engine repair or rebuilding.
For correct operation, the valve must travel smoothly within its guide and make even contact with the valve seat. Wear, deposits or mechanical damage that prevent complete seating can allow compression to escape.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Reduced engine power.
- Rough or unstable idle.
- Engine misfires.
- Poor acceleration or throttle response.
- Low or uneven cylinder compression.
- Difficult starting.
- Increased fuel consumption.
- Uneven engine operation.
- Engine management warning light.
- Misfire-related fault codes.
- Ticking or abnormal valvetrain noise.
- Poor compression-test results.
- Leakage through the intake system during a cylinder leak-down test.
- Pitting or erosion of the valve face.
- Carbon build-up around the valve.
- Bent or damaged valve stem.
- Excessive valve-stem wear.
- Failure of the valve to seal correctly against its seat.
A leaking inlet valve can allow cylinder pressure to escape back into the intake tract instead of remaining within the combustion chamber, reducing compression and combustion efficiency.
Why Replacement Matters:
The inlet valve performs two important jobs: allowing the cylinder to fill efficiently and sealing the combustion chamber when closed.
During normal engine operation, the valve is subjected to continuous opening and closing cycles, high temperatures, combustion deposits and mechanical loads. Over time, the valve face, stem or seating surface can deteriorate.
A worn or damaged inlet valve may cause:
- Loss of cylinder compression.
- Reduced engine power.
- Rough running and misfires.
- Poor throttle response.
- Increased fuel consumption.
- Uneven performance between cylinders.
- Accelerated wear of the valve seat and guide.
Replacing a defective inlet valve helps restore correct intake flow, cylinder sealing and compression.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810531102
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
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Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne Turbo 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram Ref No 3.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810531102
The product you are viewing cross references to these numbers
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- Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 992.1 Carrera 2 3.0L 2019-24
- Porsche 992.1 Carrera 4 3.0L 2019-24
- Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Targa 4 3.0L 2020-24
- Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
- Porsche 992.1 Speedster 4.0L 2019-24
- Porsche 992.1 Turbo 3.8L 2020-24
- Porsche 992.1 Turbo S 3.8L 2020-24
- Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
- Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
- Porsche 992.1 GT3 4.0L / 992 S/T 4.0L 2021-24
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman T 718 2.0L Manual (300 Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Carrera GT 2003-06
- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
- Porsche 9YA Cayenne V6 3.0L Petrol (340Hp) 2018-23
- Porsche 9YA Cayenne Coupe V6 3.0L Petrol (340Hp) 2019-23
- Porsche 9YA Cayenne S V6 2.9L Petrol (440Hp) 2018-23
- Porsche 9YA Cayenne Coupe S V6 2.9L Petrol (440Hp) 2019-23
- Porsche 9YA Cayenne Turbo V8 4.0L Petrol (550Hp) 2020-23
- Porsche 9YA Cayenne Coupe Turbo V8 4.0L Petrol (550Hp) 2019-23
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 971.1 Panamera V6 3.0L 2WD (330 Hp) 2017-20
- Porsche 971.1 Panamera 4 V6 3.0L 4WD (330 Hp) 2017-20
- Porsche 971.1 Panamera 4 V6 3.0L 4WD Executive 2017-20
- Porsche 971.1 Panamera 4 3.0L Turbocharged V6 Sport Turismo 2017-20
- Porsche 971.1 Panamera 4S V6 3.0L 4WD (440 Hp) 2017-20
- Porsche 971.1 Panamera 4S V6 3.0L 4WD Executive 2017-20
- Porsche 971.1 Panamera 4S 2.9L Twin-Turbo V6 Sport Turismo 2017-20
- Porsche 971.1 Panamera 4S Diesel V8 4.0L 4WD (422 Hp) 2017-18
- Porsche 971.1 Panamera 4S Diesel 4.0L Twin-Turbo V8 Sport Turismo 2017-18
- Porsche 971.2 Panamera 2.9L V6 2021-23
- Porsche 971.2 Panamera 4 2.9L V6 2021-23
- Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23
- Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
- Porsche 95B.2 Macan S Petrol 3.0L V6 (354Bhp) 2019-21
- Porsche 95B.2 Macan GTS Petrol 2.9L V6 (380Bhp) 2019-21
- Porsche 95B.2 Macan Turbo 2.9L V6 (440Bhp) 2019-21
Fits:
Porsche 986 Boxster(24 per car)
Porsche 987.1 Boxster(24 per car)
Porsche 987.2 Boxster(24 per car)
Porsche 981 Boxster (24 per car)
Porsche 982 Boxster 2.0L / 2.5L (16 per car)
Porsche 987C.1 Cayman(24 per car)
Porsche 987C.2 Cayman(24 per car)
Porsche 981C Cayman (24 per car)
Porsche 982C Cayman 2.0L / 2.5L (16 per car)
Porsche 996 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Porsche 991.1 2012-16 (24 per car)
Porsche 991.2 2017-19 (24 per car)
Porsche 992.1 2019>> (24 per car)
Porsche Cayenne 955 2003-06 3.2L V6 (24 per car)
Porsche Cayenne 955 2003-06 4.5L V8 (32 per car)
Porsche Cayenne 957 2007-10 3.6L V6 (24 per car)
Porsche Cayenne 957 2007-10 4.8L V8 (32 per car)
Porsche Cayenne 92A 2011-18 3.6L V6 (24 per car)
Porsche Cayenne 92A Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
Porsche Cayenne 9YA 2018>> 2.9l / 3.0L V6 (12 per car)
Porsche Cayenne 9YA Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
Porsche Macan MKI 2.0L V4 (16 per car)
Porsche Macan MKI S 3.0L V6 (24 per car)
Porsche Macan MKI Turbo 3.6L V6 (24 per car)
Porsche Macan MKII 2.0L V4 (16 per car)
Porsche Macan MKII 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 970 3.0L V6 Diesel (24 per car)
Porsche Panamera 970 3.6L V6 (24 per car)
Porsche Panamera 970 4.8L V8 (32 per car)
Porsche Panamera 971 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 971 4.0L V8 Diesel (32 per car)
Porsche Carrera GT V10 (40 per car)
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
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