Single forged connecting rod BMW 325 - 2.5L - M54B25 for forged piston

Single forged ZRP connecting rod in 4340 steel for BMW M54B25, 22 mm piston pin.

This reference lets you order a single rod, either to complete an existing set or to replace one damaged part on the BMW M54B25 engine, fitted notably to the BMW 325. It is identical in every respect to the rods in the full set offered for this engine: same steel, same beam profile, same bolts.

Specifications

+ Brand: ZRP
+ Beam profile: H-Beam
+ Material: 4340 forged steel
+ Bolts: ARP 2000
+ Center-to-center length: 145.00 mm
+ Piston pin diameter: 22.00 mm
+ Big end bore: 48.00 mm
+ Big end width: 21.90 mm
+ Weight: 544 g

Torque and bolt stretch

ARP 2000 bolts are tightened to 61 Nm, or by stretch control between 0.140 and 0.152 mm. Measuring stretch with a dial indicator remains the most reliable method: it reflects the real tension in the bolt, whereas torque depends on thread friction.

Rod supplied individually, bolts included. A full set of six rods is required for a complete rebuild on this engine.