ZRP I-shaped forged connecting rods for Volvo 740, 940, B230, B234F, 152 mm – set of 4

The ZRP forged I-beam connecting rods for Volvo 740 and 940 models with B230 and B234F engines are designed for engine tuning applications using a 152 mm center distance. Their construction from high-resistance 4340 steel and their I-beam profile are engineered to provide high rigidity and withstand repeated mechanical stress.

The AMPCO 18 connecting rod small ends feature a radial groove that serves as an oil reservoir for the 23 mm gudgeon pin. Part number R-VOL-003-I includes 4 connecting rods with 3/8" ARP2000 fasteners, ARP mounting lubricant, and instructions.

Technical Specifications

• Brand: ZRP
• Manufacturer Part Number: R-VOL-003-I
• Applications: Volvo 740 and 940, depending on engine type
• Engine codes: B230 and B234F
• Range: Standard Series
• Profile: I-beam
• Material: 4340 forged steel
• Center-to-center length: 152.00 mm
• Gudgeon pin diameter: 23.00 mm
• Connecting rod bush diameter: 52.00 mm
• Conrod top end width: 29.46 mm
• Connecting rod small end bushings: AMPCO 18
• Fasteners: 3/8" ARP2000
• Manufacturer-specified weight per connecting rod: 618 g
• Weight matching: ± 1 g
• Packaging: set of 4 connecting rods

Design and Manufacturing

• Separately forged body and cap: two-piece construction.
• I-beam profile: geometry designed for rigidity.
• Double-ribbed caps with humps: truss for the connecting rod top end.
• Centering sockets: precise repositioning of the cap during reassembly.
• Grooves on the bearing flanks: weight reduction in the affected areas.
• Multi-stage heat treatments: resistance, dimensional stability, and fatigue resistance.
• Shotpeening: improved fatigue resistance.
• Magnetic particle inspection: detection of defects in forged parts.
• CNC machining: specified precision up to 0.0002", or approximately 0.005 mm.
• Center distance tolerance: less than 0.001", or 0.0254 mm.
• Bending and torsion testing: verification of geometry.
• Finite element analysis: computer-aided stress analysis.

Mounting on Volvo B230 and B234F engines

Verify that the 152 mm center distance matches the pistons and crankshaft stroke being used. Check the sizes of the shafts, bearings, operating clearances, and clearance before assembly. Follow the oiling and tightening instructions specific to the supplied ARP2000 fasteners.

Key Features

• 4340 forged steel and I-beam profile.
• 152 mm center distance and 23 mm gudgeon pin diameter.
• AMPCO 18 rings with oil reservoir.
• ARP2000 fasteners included.
• Set of 4 connecting rods matched to within ±1 g of weight.