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Porsche > 991 (911) MK1 2012-2016 > Engine Rebuild Parts > Engine Valves / Guides / Springs >

Engine cylinder head inlet valve. Porsche 993 C2 / 993 C4 / 993 Turbo ❭ 99310540902

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OE Match

99310540902/1

Product Information

Engine Cylinder Head Inlet Valve.
The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to regulate the flow of air and fuel into the combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient combustion, engine performance and long-term reliability.

Fits:

Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) TURBO S 1994-97

Diagram Ref No 9

Constructed from premium-grade materials engineered to withstand continuous operation and high engine temperatures, the inlet valve works in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly to control intake airflow with precise timing. Proper valve operation ensures optimal cylinder filling, efficient combustion and the responsive performance expected from a Porsche engine.

What This Product Does:

Controls the intake of air and fuel into the combustion chamber.
Opens and closes in precise synchronisation with the engine cycle.
Maintains an effective seal during compression and combustion.
Supports efficient airflow and cylinder filling.
Helps maximise engine power and throttle response.
Contributes to fuel economy and emissions control.
Forms a critical part of the engine valvetrain system.

Symptoms Of Wear Or Failure:

Reduced engine power and acceleration.
Rough idle or uneven engine operation.
Engine misfires.
Poor throttle response.
Increased fuel consumption.
Low compression in the affected cylinder.
Difficulty starting the engine.
Ticking or tapping noises from the cylinder head.
Engine management warning lights or fault codes.
Failed compression or leak-down test results.

Why Replacement Matters:

Inlet valves operate continuously under demanding conditions and are subjected to thousands of opening and closing cycles every minute. Over time, exposure to heat, combustion deposits and mechanical wear can cause valves to become worn, bent, burnt, carbon-contaminated or develop sealing issues.
A damaged inlet valve can restrict airflow into the combustion chamber, reducing combustion efficiency and negatively affecting engine performance. If left unresolved, valve-related problems can lead to compression loss, increased fuel consumption and potential damage to valve seats, cylinder heads and other internal engine components.
Replacing a worn or damaged inlet valve restores proper airflow, improves combustion efficiency and helps maintain optimal engine performance. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring reliable operation and helping protect your Porsche engine from premature wear and costly repairs.

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

99310540902

99310540902

993.105.409.02

3310.239

854429-6

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Engine cylinder head inlet valve. Porsche 993 C2 / 993 C4 / 993 Turbo ❭ 99310540902