Mini Cooper R56 Turbo I-Beam Connecting Rods

Manufactured from 4340 high tensile steel, these connecting rods are designed for high performance, extreme durability, and extra rigidity. Featuring a Tapered Pin End, they are compatible with OEM pistons. The bushings are made from AMPCO 18 material, offering excellent resistance to wear and fatigue, and include a radial groove for oil reservoir. The rods are shot peened to relieve stress and undergo multi-stage heat treatment to enhance rigidity. Tight tolerances in the production process ensure perfect fitment while optimizing oil clearances. Bend and twist are tightly controlled. Each rod includes ARP 2000 cap fasteners rated at 220,000 psi, with an optional upgrade to ARP L19 material at 260,000 psi. The kit is supplied with ARP moly and full fitting instructions.

Additional Machining Processes

• Tapered Pin End – Suitable for OEM pistons
• Dowel sleeves for perfect fit and accurate re-assembling
• Lipped Cap Relief for improved big-end integrity in extreme applications
• Grooves in Thrust Face for weight reduction

Technical Features of ZRP Connecting Rods

• Two-Piece forging for great strength
• Shot Peening for improved fatigue life
• Magnaflux Inspection ensures material consistency meets high-quality standards
• Double ribbed caps for added support
• Multi-Stage Heat Treatment for maximum strength, dimensional stability, and fatigue life
• CNC machining for superior tolerances, precise to 0.0002"
• Center to center maintained under 0.001" tolerance
• Finite Element Analysis (FEA) for computer-generated stress analysis of con rods
• Optimal balancing for weight-matched sets of ± 1 gram