964 - 993 Carrera 4.1 Liter Engine Kit for Porsche 911

Big Bore Kit #3 – 4.1 Liters for Porsche 964 / 993

High-quality 4.1-liter engine conversion with Pankl pistons, Mahle cylinders and Carrillo steel connecting rods

The Big Bore Kit #3 allows the construction of a 4.1-liter engine based on the Porsche 964 and 993 engines.
in conjunction with a matching Porsche 997 GT3 4.0-liter crankshaft. The combination of high-quality
Motorsport components form the basis for a performance-oriented engine design.

Scope of delivery

• 6 x Pankl pistons including piston pins, piston rings and retaining clips, 104 mm

• 6 x Mahle cylinders

• 6 x Carrillo steel connecting rods, part number PR_RVGS_2HS_5138B6S

• 2 x Elring cylinder head gaskets

Technical data

• Engine displacement: 4,098 cm³ (approx. 4.1 liters)

• Crankshaft stroke: 80.4 mm

• Piston diameter: 104 mm

• Suitable crankshaft: Porsche 997 GT3 4.0 liter

• Crankcase barrel diameter: 109 mm

• Base vehicles: Porsche 964 and 993

Required adjustments during installation

• The crankcase must be bored out to the required barrel size of 109 mm.

• Installation of the OEM quadring is required.

• The oil pump needs to be reworked or replaced with the appropriate Porsche oil pump.

• The intermediate shaft gear must be machined or replaced with the corresponding Porsche intermediate shaft.
  be replaced.

Optional components

Depending on the engine design, the following parts may also be required:

• Crankshaft: 997 102 021 8D

• Connecting rod bearings: 12 x 996 103 121 94

• Oil pump: 997 107 007 91

• Intermediate shaft: 997 105 931 8D

• OEM Quadring: 999 705 023 41

Optional crankshaft

Porsche 997 GT3 RSR, model year 2009, 4.0 liter – part number 997 102 021 8D.

Important instructions:

The Big Bore Kit is designed for professionally planned engine modifications. It is compatible with all...
Components and the necessary machining measures must be determined before installation based on the specific requirements.
The engine must be inspected. Installation should be carried out by an experienced engine specialist.

Danger:
Price changes may occur during the ordering process due to Porsche price adjustments.