Wössner Forged Piston Kit for Renault Clio Williams - Mégane 2.0 16S F7R, 82.70 mm bore

The Wössner K9034DA forged piston kit is designed for the Renault Clio Williams 2.0 16S and Mégane 2.0 16S equipped with the naturally aspirated F7R engine. This standard-dimension version is intended for a cylinder bore of 82.70 mm. The piston diameter specified by Wössner is 82.62 mm: this should not be confused with the engine block bore.

The pistons feature a dome volume of +4.35 cm³ and a stated compression ratio of 11.2:1, compared to 10:1 for the specified stock configuration. This kit is intended for use in the rebuild or tuning of the naturally aspirated F7R engine to increase the compression ratio.

The kit’s geometry corresponds to a stroke of 93 mm, a connecting rod center distance of 144 mm, and a compression height of 30.7 mm. The kit for the four-cylinder engine includes the pistons, piston rings, 21 mm gudgeon pins, and retaining clips.

Engine Mounting and Preparation

Mounting requires a metrological inspection of the engine block and adherence to Wössner specifications for piston-cylinder clearance and ring end clearance. The nominal bore does not replace the measurements required for assembly.

The final compression ratio must be verified based on the volume of the combustion chambers, the thickness of the head gasket, and the position of the pistons at top dead center. Also check the clearance between the pistons and the valves, particularly with a machined cylinder head or modified camshafts. Firing and injection tuning must take into account the engine configuration and the fuel used.

Technical Specifications

• Brand: Wössner
• Manufacturer Part Number: K9034DA
• Product Type: Forged Piston Kit
• Engine code: F7R
• Engine: 2.0-liter asprated 16-valve
• Number of cylinders: 4
• Nominal cubic capacity: 2.0 liters
• Cylinder bore: 82.70 mm
• Specified piston diameter: 82.62 mm
• Overbore: 0 mm, standard bore
• Stroke: 93 mm
• Dome volume: +4.35 cm³
• Shaft diameter: 21 mm
• Compression height: 30.7 mm
• Connecting rod center distance: 144 mm
• Specified compression ratio: 10:1
• Advertised kit compression ratio: 11.2:1
• Piston rings: 3 rings per piston
• Retainer clip part number: CW21
• Kit contents: 4 pistons with segments, gudgeon pins, and retaining clips

Compatible vehicles

• Renault Clio Williams 2.0 16S: F7R engine
• Renault Mégane 2.0 16S: F7R engine

Check the engine code and mounting dimensions before ordering. These applications apply to the F7R engine; they should not be extended to other Clio and Mégane engine variants.