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Porsche 997 (911) MK1 2005-2008 997 MK1 TURBO 2007-09 Engine Rebuild Parts Engine Valves / Guides / Springs

Engine cylinder head inlet valve. Porsche 356 B 1600 Super 90  ›  61610540100

Engine cylinder head inlet valve. Porsche 356 B 1600 Super 90 - 61610540100
2
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61610540100/1
Product Information
Product Information
Engine Cylinder Head Inlet Valve.

The OE Match Engine Cylinder Head Inlet Valve is a precision replacement valvetrain component for the Porsche 356 B 1600 Super 90. It controls the entry of the air and fuel mixture into the combustion chamber and provides an essential sealing surface when the valve closes against its seat.

Fits:
  • Porsche 356 B 1600 Super 90

Diagram Ref No 11

During the intake stroke, the valve opens to allow the combustion mixture to enter the cylinder. It then closes firmly against the valve seat so the cylinder can build and retain the compression required for efficient combustion.

Because the inlet valve operates continuously whenever the engine is running, correct valve condition, alignment and seating are essential for smooth running, good compression and consistent engine performance.

What This Product Does:

  • Controls the flow of the air and fuel mixture into the combustion chamber.
  • Opens during the intake stroke to allow the cylinder to fill.
  • 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.
  • Works with the valve guide, valve seat, spring and associated valvetrain components.
  • Replaces an inlet valve that has become burnt, bent, pitted or excessively worn.
  • Helps restore correct cylinder-head operation during an engine rebuild.

For correct operation, the valve must move smoothly within its guide and contact the valve seat evenly around its circumference. Any damage that prevents full seating can allow compression to escape.

Symptoms Of Wear Or Failure:
Possible symptoms include:

  • Low or uneven cylinder compression.
  • Rough or unstable idle.
  • Engine misfires.
  • Loss of engine power.
  • Poor acceleration or throttle response.
  • Difficult starting.
  • Increased fuel consumption.
  • Uneven engine running.
  • Ticking or abnormal valvetrain noise.
  • Poor results during a compression test.
  • Leakage through the intake system during a leak-down test.
  • Pitting or erosion of the valve face.
  • Carbon deposits around the valve seating area.
  • Bent or damaged valve stem.
  • Excessive valve-stem wear.
  • Inability of the valve to seal correctly against its seat.

Low compression, rough running and poor sealing during compression or leak-down testing are recognised signs of inlet-valve problems.

Why Replacement Matters:
The inlet valve plays a direct role in both filling and sealing the cylinder. If the valve becomes worn, bent, burnt or damaged, it may no longer sit correctly against the valve seat.

Poor sealing allows compression to escape from the combustion chamber, potentially causing:

  • Reduced engine power.
  • Rough running and misfires.
  • Poor starting.
  • Uneven cylinder performance.
  • Reduced combustion efficiency.
  • Increased fuel consumption.
  • Further wear to the valve and valve seat.

Replacing a defective valve helps restore the correct combustion-chamber seal, cylinder compression and intake flow.



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61610540100
61610540100

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Click 'Zoom in' for large parts diagram.
Diagram ref no 10

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Engine cylinder head inlet valve. Porsche 996 Turbo / 997 Turbo - 99610511172
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Engine cylinder head inlet valve.

Fits:
Porsche 996 Turbo/GT2 2001-05
Porsche 997.1 Turbo / GT2 3.6L 2007-09
Porsche 997.2 GT2 RS 3.6L 2011

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
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99610511172
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The product you are viewing cross references to these numbers
Engine cylinder head inlet valve. Porsche 996 Turbo / 997 Turbo - 99610511172
2
Engine cylinder head inlet valve. Porsche 996 Turbo / 997 Turbo
99610511172/1
Product Information
Product Information
Engine Cylinder Head Inlet Valve.

The OE Match Engine Cylinder Head Inlet Valve is a precision replacement valvetrain component designed for selected Porsche 996 Turbo, 996 GT2, 997 Turbo, 997 GT2 and GT2 RS 3.6L engines.

Fits:
  • Porsche 996 Turbo/GT2 2001-05
  • Porsche 997.1 Turbo / GT2 3.6L 2007-09
  • Porsche 997.2 GT2 RS 3.6L 2011

Diagram Ref No 2

The inlet valve controls the flow of the intake charge into the combustion chamber. During the intake stroke, it opens to allow the cylinder to fill before closing securely against the valve seat for the compression and combustion phases.

Correct valve condition, alignment and seating are essential for maintaining cylinder compression, efficient airflow and consistent engine performance. This is particularly important in high-performance turbocharged engines, where reliable cylinder sealing and airflow are critical under increased boost pressure and engine load.

What This Product Does:

  • Controls the intake of air 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 breathing.
  • Helps maintain throttle response and engine performance.
  • Works with the valve guide, valve seat, valve spring and associated valvetrain components.
  • Helps maintain reliable operation in high-performance turbocharged engines.
  • 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 move smoothly within its guide and form an even seal against the valve seat. Wear or damage that prevents complete seating can allow compression to escape and reduce engine efficiency.

Symptoms Of Wear Or Failure:
Possible symptoms include:

  • Low or uneven cylinder compression.
  • Engine misfires.
  • Rough or unstable idle.
  • Reduced engine power.
  • Poor acceleration or throttle response.
  • Difficulty starting.
  • Increased fuel consumption.
  • Uneven engine running.
  • Check engine or engine-management warning light.
  • Misfire-related fault codes.
  • Ticking or abnormal valvetrain noise.
  • Poor compression-test results.
  • Leakage through the intake tract during a cylinder leak-down test.
  • Pitting or erosion of the valve face.
  • Carbon deposits 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 system rather than remaining within the combustion chamber.

Why Replacement Matters:
The inlet valve performs two essential functions: allowing the cylinder to fill efficiently and sealing the combustion chamber when closed.

During engine operation, the valve is exposed to continuous opening and closing cycles, high temperatures, combustion deposits and significant mechanical loading. In turbocharged engines, reliable valve sealing becomes particularly important because the engine operates under substantial cylinder pressures.

Over time, an inlet valve may suffer from:

  • Valve-face pitting or erosion.
  • Carbon build-up.
  • Valve-stem wear.
  • Mechanical distortion.
  • Damage caused by poor seating.
  • Wear associated with excessive valve-guide clearance.
  • Damage caused by valve-to-piston contact.

A worn or damaged valve can lead to compression loss, misfires and reduced engine output.

Replacing a defective inlet valve helps restore:

  • Correct cylinder sealing.
  • Strong compression.
  • Efficient intake airflow.
  • Smooth engine operation.
  • Consistent power delivery.
  • Reliable turbocharged engine performance.
  • Correct valvetrain operation.



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Engine cylinder head exhaust valve. Porsche 996 Turbo / 997 Turbo
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Fits:
Porsche 996 Turbo/GT2 2001-05
Porsche 997.1 Turbo / GT2 3.6L 2007-09
Porsche 997.2 GT2 RS 3.6L 2011

Click 'Zoom in' for large parts diagram.
Diagram Ref No 3.

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