ZRP Forged Stroker Crankshaft for Volvo B230 & B234 2.3 - C-VOL-002

The ZRP Stroker C-VOL-002 crankshaft for Volvo B230 and B234 2.3-liter engines increases cubic capacity to approximately 2.5 liters with a bore of 96 mm. Its 86 mm stroke increases the distance traveled by the pistons and the volume swept by the cylinders.

Developed for demanding engine modifications, it is fully CNC-machined from solid blocks of 4340 aerospace-grade steel. Its profile counterweights, oiling system, and surface treatments meet the mechanical stresses and oiling requirements of a modified engine.

Technical Specifications

• Brand: ZRP
• Manufacturer Part Number: C-VOL-002
• Compatible Engines: Volvo B230 and B234
• Type: Stroker, increased stroke and cubic capacity
• Manufacturing: CNC machined from solid stock
• Material: 4340 billet steel, aerospace grade
• Stroke: 86.00 mm
• Connectingrod journal diameter: 63.00 mm
• Rod journal diameter: 49.00 mm
• Weight: 22.30 kg
• Cubic capacity with a 96 mm bore: approximately 2.5 L
• Balancing: performed on Sunnen equipment, with inspection report provided

Design and oiling

• Aero-Wing profiled counterweights: designed to reduce mass and improve the aerodynamic performance of the rotating crankshaft.
• Dual main oil supply: lubricant circulation via direct passages.
• High-Speed oiling system: designed to improve oil supply at high RPM.
• Chamfered oil holes: finish on the oil duct inlets.
• Connection spokes of the bearing surfaces: geometry designed to better distribute mechanical stresses.
• Lightweight crankshaft journals with a conical profile: a design that contributes to mass reduction.

Manufacturing Processes and Inspections

• Full CNC machining: precise production of geometries and bearing surfaces.
• Plasma ion nitriding: surface hardening of the treated areas.
• Multi-stage heat treatment: to achieve the desired mechanical properties.
• Shot blasting: mechanical surface treatment.
• Magnetic particle inspection on each part: detection of surface or near-surface defects.
• Heat treatment to improve abrasion resistance.
• Micro-polishing of bearing surfaces: a finish designed to extend the service life of the bearings.
• Ultrasonic and X-ray inspections: verification of material integrity.

Mounting in a 2.5 L Stroker configuration

Increasing the stroke requires a properly matched combination of connecting rods, pistons, and bearings. Before assembly, verify the position of the pistons at top dead center, the compression ratio, the operating clearances, and the clearance of the moving assembly within the block. The final cubic capacity depends on the selected bore.

Key Features

• 2.5 L configuration with a 96 mm bore and an 86 mm stroke.
• Machined-from-solid 4340 steel.
• Aero-Wing counterweights and lightweight crankshaft journals.
• High-Speed oiling and chamfered oil holes.
• Plasma nitriding and micro-polished bearing surfaces.
• Controlled balancing with a balance report provided.