Connecting Rods with L19 ZRP Bolts for Peugeot / Citroen 1.6L TU5J4 / TU5JP4 H-Beam

H-beam connecting rods for Citroën/Peugeot 1.6L TU5J4/TU5JP4 engines are manufactured from high-strength 4340 steel and designed for high performance and extreme durability. Their lightweight design combines optimal performance with proven reliability at high RPMs. The bushings are made of aluminum-silicon/bronze and feature a radial groove that acts as an oil reservoir. These connecting rods incorporate a reinforced pin end that minimizes deformation under high inertial loads, thereby reducing weight. They undergo shot peening to relieve internal stresses and multi-stage heat treatment to increase rigidity. Strict production process tolerances ensure a perfect fit and optimize oil clearance. Flex and twist are strictly controlled. Each connecting rod includes ARP 2000 hex head bolts with a strength of 220,000 psi; optionally, ARP L19 material with a strength of 260,000 psi can be chosen. The complete kit is supplied with ARP molybdenum oil and comprehensive assembly instructions. Additional machining processes

Dowel pins for perfect fit and precise reassembly.

Flanged cap relief for increased big-end integrity in extreme applications.

Thrust face grooves for weight reduction.

ZRP Connecting Rod Technical Features

Two-piece forging for great strength.
Shot peening for increased fatigue life.
Aluminum-silicon/bronze bushing with radial groove.

Magnaflux inspection ensures that the consistency of the forging material meets our high quality standards.

Double rib caps for added support.

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

CNC machined for superior tolerances, with accuracy up to 0.0002″.

Center-to-center distance is maintained below 0.001″ tolerance.

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

Optimal balancing for sets with matched weight of ± 1 gram.