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Wossner Pistons

VW & Audi 1.8 20v Turbo (9.5:1) Wossner Forged Piston Kit 

Wössner A4, A6 & TT / GOLF GTi Mk4 1.8 20v Race Comp Turbo Forged Piston Kit.

Kit reference: K9271

Bore size: Please confirm the required bore size before ordering. This kit reference does not identify an individual piston size.

Technical specifications

Engine Code APX / APY / BAM
Model years from 1998
Model years to 2006
Bore Size 81.5mm – K9271D050 , 81mm – K9271DA , 82.5mm – K9271D150 , 82mm – K9271D100
Stroke 86.4mm
Compression Height 32.7mm
Number of Rings 3
Piston pin diameter 20mm
Number of cylinders 4
Valves Per Cylinder 5

Piston size specifications

Piston reference Piston diameter Compression ratio
K9271D100 81.93mm 9.71:1
K9271D050 81.43mm 9.61:1
K9271D150 82.43mm 9.82:1
K9271DA 80.93mm 9.5:1

Piston diameter and cylinder bore are different measurements. Confirm engine specification, compression ratio and the correct size before ordering.

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