ZRP Connecting Rods for Honda B18C HD Series

ZRP "Heavy Duty" I-Beam connecting rods for Honda B18C engines are designed for high-power/supercharged applications. Made from the highest quality 4340 high-tensile steel, they feature a specially optimized shape for high performance and extreme durability. The bushings are made from AMPCO 18 material, which offers excellent wear and fatigue resistance, and feature a radial groove that acts as an oil reservoir. They are shot-peened to relieve material stress and undergo multi-stage heat treatment to increase their rigidity. Strict tolerances in the production process ensure a perfect fit and optimize oil clearances. Bending and twisting are strictly controlled. Each connecting rod includes 3/8" ARP 2000 head bolts with a strength of 220,000 psi. Optionally, ARP L19 material with a strength of 260,000 psi can be purchased. The complete kit is supplied with ARP Moly lubricant and comprehensive assembly instructions.

Additional machining processes

Centering bushings for a perfect fit and precise reassembly

Flanged cap relief for increased connecting rod head integrity in extreme applications

Thrust face grooves for weight reduction

ZRP Connecting Rod Technical Features

I-Beam shape for increased rigidity

Two-piece forging for high strength

Shot peening for increased fatigue resistance

Magnaflux inspection ensures that forged material consistency meets our high quality standards

Double rib caps for added support

Multi-stage heat treatment for maximum strength, dimensional stability, and fatigue resistance

CNC machining for superior tolerances, accurate to within 0.0002"

Center-to-center distance is maintained to within 0.001"

Finite Element Analysis (FEA): computer-generated stress analysis of connecting rods

Optimal balancing for weight-matched sets of ± 1 gram