Mahle Piston & Cylinder

Engine piston.
Price is for EACH (must be purchased as a set of 6).

Fits:
Porsche 997.2 Carrera 4 / 4S / 4GTS 3.8L 2009 - 2012
* engine code: A101

Porsche 991.1 Carrera 4 / 4S / 4GTS 3.8L 2012 - 2016
 * engine code: A103
 * cars without Compression variant   (PR:-145) 

Porsche 981 Boxster Spyder 3.8L 2016
Porsche 981C Cayman GT4 3.8L 2016

Diagram ref no 1

Engine code: MA1.01 /  MA1.03
Cyl. Bore: 102 mm
Length: 56.4 mm
Compression: Height 32.95 mm
Bolt Length: 56 mm
Bolt: Ø 22 mm


This piston is a core internal engine component that reciprocates in the cylinder bore, converting combustion pressure into mechanical motion via the connecting rod and crankshaft. It also works with piston rings to seal the combustion chamber, manage oil control, and withstand high heat/pressure - helping maintain factory-level performance, durability, and engine dynamics.

Functions & Technical Role:
•  Combustion pressure handling: Converts the force of combustion into linear piston movement
•  Sealing the chamber: Works with piston rings to maintain compression and prevent blow-by
•  Oil control: Cooperates with rings and skirt design to manage oil lubrication

Fitment / Position on Car
•  Installed on: Inside the engine block’s cylinder bores
•  Location: One per cylinder; typically 6 pistons required for a complete 3.8 L flat-six engine
•  Orientation: Works with piston rings, wrist pin, and connecting rod to form the bottom of the combustion chamber

Manufactured using advanced alloy technology and strict quality control standards, MAHLE pistons are engineered to withstand extreme thermal loads and high engine speeds typical of Porsche applications. The piston works in conjunction with piston rings and the connecting rod assembly to convert combustion energy into smooth, reliable crankshaft rotation.

Ideal for engine rebuilds, overhauls, or performance restorations where maintaining factory specifications is essential.

Please note: Pistons are sold individually. Six required per engine.

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Related, superseded, cross reference or alternative numbers for comparison.

9A110393800

The product you are viewing cross references to these numbers

Piston and Cylinder Set - 3.8ltr - 102mm - Slip Fit - 9.4:1

This Mahle 3.8-litre Piston and Cylinder Set is a high-performance engine upgrade for Porsche 996 turbo, 997 turbo and GT2 RS applications, combining 102mm forged alloy pistons with slip-fit ST52 steel cylinders.

Fits:

• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT2 2007-09
• Porsche 997 MKII GT2 RS 2011-13

Designed for high-performance Mezger engine builds, the kit features a 9.4:1 compression ratio, deeper mirrored valve reliefs, offset piston pin bores and pre-installed piston rings.

What Does This Upgrade Do?

The 102mm bore allows the engine to be built to approximately 3.8 litres, providing increased displacement and the potential for greater horsepower and torque when combined with the correct engine components, turbocharger specification and ECU calibration.

Forged Mahle Pistons

Mahle's forged alloy pistons provide greater and more consistent strength than conventional cast pistons, making them well suited to high-output turbocharged engines.

A proprietary anti-friction coating helps reduce friction and wear while protecting the piston and pin bore surfaces.

The pistons also feature larger, deeper mirrored valve reliefs and use 23mm wrist pins.

Offset Piston Pin Bore

The piston pin bore is offset, or de-axiert, to help reduce piston noise and maintain quieter operation similar to the factory design.

ST52 Steel Cylinders

The cylinders are manufactured from ST52 steel, providing high strength and thermal resistance for demanding turbocharged engine applications.

The cylinders use a slip-fit design, simplifying installation without requiring machining of the engine housing for the cylinder fitment.

Pre-Installed Piston Rings

The sealing and oil-control rings are supplied pre-installed on the pistons, helping simplify assembly and ensuring the correct piston and ring combination is supplied as a complete matched kit.

Performance Potential

Increasing engine displacement can provide additional torque and horsepower, but final output depends heavily on the complete engine specification.

Turbochargers, camshafts, crankshaft configuration, intake and exhaust components, fuelling and ECU calibration will all influence the final result. Builds exceeding 700hp are possible with an appropriately specified engine and software, but this figure should not be considered a guaranteed output from the piston and cylinder set alone.

Key Features

• Mahle 3.8ltr piston and cylinder set
• Suitable for Porsche 996 Turbo / 997 Turbo / GT2 RS applications
• 102mm bore
• 9.4:1 compression ratio
• Forged alloy pistons
• ST52 steel cylinders
• Slip-fit cylinder design
• 23mm wrist pins
• Larger and deeper mirrored valve reliefs
• Offset piston pin bore for quieter operation
• Anti-friction piston coating
• Pre-installed piston rings
• Designed for high-performance turbo engine builds
• Complete piston and cylinder kit
• Made in Germany by Mahle GmbH

Mahle Porsche 996 / 997 turbo & GT2 RS Piston and Cylinder Sets

Mahle performance piston and cylinder sets provide a premium solution for Porsche Mezger engine rebuilds, displacement upgrades and high-performance turbo applications.

The combination of 102mm forged pistons, 9.4:1 compression and ST52 steel slip-fit cylinders makes this 3.8L kit particularly suited to Porsche 996 Turbo, 997 Turbo and GT2 RS engine builds where increased displacement, strength and performance potential are required.

Professional engine assembly, measurement and calibration are recommended to ensure correct clearances and compatibility with the complete engine specification.

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

100103038TU997

The product you are viewing cross references to these numbers