41mm X 8mm Valve - Type 4 Inlet Valve - 1800cc (AW Engine Code)

This replacement inlet valve is designed for 1800cc Type 4 aircooled engines fitted to VW Baywindow buses produced from August 1973 to July 1974, specifically those using engine code AW. It is also suitable for other 1800cc Type 4 applications sharing the same valve specification.

The inlet valve plays a critical role in engine operation by controlling the flow of the air–fuel mixture into the combustion chamber. As the camshaft opens the inlet valve via the valve train, the mixture enters the cylinder, allowing efficient combustion. Correct valve dimensions and material quality are essential to maintain compression, ensure proper sealing, and deliver consistent engine performance.

Manufactured by IVAM in Italy, a respected OE supplier known for high-quality valve train components, this valve is produced to precise tolerances using correct-grade materials. This ensures excellent resistance to heat, wear, and valve seat erosion—key factors in the longevity of Type 4 engines, particularly under sustained load conditions common in buses.

This valve features the correct 41mm valve head, 8mm stem, and 117mm overall length, with three keeper grooves, making it a direct replacement for original specification inlet valves used on 1800cc Type 4 engines. Ideal for engine rebuilds, top-end overhauls, or replacing worn or damaged valves.

Measurements

• Valve Head Diameter: 41mm

• Valve Stem Diameter: 8mm

• Overall Length: 117mm

• Keeper Grooves: 3

Quality & Quantity

• Manufactured by IVAM (Italy)

• Sold individually

• 4 required per engine

Engine Compatibility (Aircooled)

• AW – 1800

• AP – 1800

• ED – 1800

Vehicle Applications

• VW Baywindow Van: 1973 – 1974

• Porsche 914: 1974 – 1976