Forged connecting rods Ford Fiesta ST150 - 2.0L 16V - Duratec for forged pistons

The Ford Duratec HE 2.0 engine

The Ford Duratec HE is an inline four-cylinder, 1,999 cc 16-valve naturally aspirated engine, introduced around 2000 and sharing its architecture with the Mazda LF block (MZR family). With an 87.5 mm bore and an 83.1 mm stroke, it powers many Ford models (Mondeo III, Focus II, C-Max, Fiesta ST) under the codes CJBA, AOWA, AOBA, N4JA and N4JB, with factory output of roughly 145 to 150 hp.

A modern, sturdy block, the Duratec HE is a popular tuning base, especially for turbo or supercharger conversions. As soon as power and cylinder pressure rise, the stock rod, not designed for such loads, becomes the weak link. Forged connecting rods secure the power increase and unlock the engine's full potential over time.

Forged connecting rods

Forged connecting rods are among the key parts of any engine build. Forged from steel and then precision-machined, they offer mechanical strength and fatigue resistance far above the stock sintered-metal rods, which quickly reach their limits as power rises.

Each rod is balanced and supplied with its ARP high-performance hardware. Available in I-Beam or H-Beam profile depending on the build level, they secure large power gains and high rpm, where the stock rod eventually bends or breaks.

Engineered to withstand the heavy loads of built engines, they cover every discipline (rally, drift, drag, circuit and track use, hillclimb, time attack) and suit both naturally aspirated builds and turbocharged conversions, from Stage 2 and Stage 3 right up to competition Stage 4+.

Technical specifications of the Duratec HE forged connecting rods

Torque and bolt stretch

Correct tightening is no finishing detail on the Duratec HE: it is what stops the cap from moving by a few microns millions of times per hour of running. Below the specified range preload becomes insufficient, the two half bores work against each other, the parting face beds down and clamping drops further; the shell ends up hammered, knocking appears under load and the bearing contact degrades until the oil film is cut. Above it, excess tension takes the bolt into its plastic domain: it never returns, preload vanishes with the first heat cycle, the bearing bore distorts and the big end goes oval, which locally closes clearance and raises bearing temperature. The four rods are therefore tightened to the values in the table below, as published by the fastener manufacturer for ARP 2000 and ARP L19 in 3/8", and to nothing else. Checking stretch with a dial gauge is the reference method, the only one that reflects the tension actually installed; ARP assembly lubricant is mandatory and the kit instructions take priority.

Technical guide

4340 forged steel: what is it?

Connecting rod profiles

	I-Beam profile. With its slimmer central section, the I-Beam rod is lighter: less inertia and freer rev pickup. It is the preferred profile for rev-oriented builds and moderate turbo conversions of the Duratec HE.
	H-Beam profile. The H-shaped section offers high rigidity and excellent resistance to bending and compression. Slightly heavier than an I-Beam rod, it favours strength: the choice for high-torque, high-boost Duratec HE builds.

How to choose your rod bolts?

On a rod bolt, performance cannot be seen: it lies in the steel grade, in the way the quench and temper are run, and in the fact that the threads are rolled after that treatment rather than cut before it. That last detail changes fatigue life a great deal, because it work-hardens the thread root, the only place where a crack starts. Then there is chemical stability, which governs storage precautions, and manufacturing consistency, which gives the same preload to every bolt. This 2.0-litre Duratec takes its hardware in 3/8"-38 mm in two grades; choose according to target power and engine speed, then tighten by measured stretch.

ARP 2000 is a wrought low-alloy steel, treated through the section, with tensile strength settling around 220,000 psi, i.e. ~1,517 MPa. Its threads, rolled after heat treatment, work-harden the most heavily loaded area of the bolt: cyclic fatigue endurance is high, and the chemical stability of the grade avoids any storage rule. It is rated up to 200 hp per cylinder in 3/8" and up to 8,500 rpm, which makes it the most common grade in circuit racing, trackdays, drift, rally, drag and hillclimb. On this Duratec it equips both ZRP rods offered, the 471 g H profile and the 515 g I profile, in 3/8"-38 mm.

L19 (tensile strength ~260,000 psi, i.e. ~1,793 MPa) is designed for engines pushed to the extreme, up to 250 hp per cylinder with 3/8" bolts, and up to 10,000 rpm: very high boost pressure, sustained high rpm and high cylinder pressure. It is the choice for big-power builds: drag racing, drift, rally and circuit use. Caution: sensitive to corrosion and hydrogen embrittlement, it must always be stored and fitted oiled, away from moisture.

Measuring bolt stretch

Buy the ARP stretch gauge →

The brands offered

ZRP is a Greek brand of high-performance forged connecting rods, designed by Alex Drakos in Athens. Each rod is forged from 4340 steel, precision-machined and balanced to ±1 g to preserve reliability at high rpm. Offered here in an I or H profile with ARP 2000 or ARP L19 hardware, they are manufactured and inspected in Greece, and proven in rally, on track and in drift.

Glossary

1) Small end 2) Small-end diameter 3) Rod beam 4) Rod bolt 5) Big end 6) Rod nut / bolt 7) Rod cap 8) Big-end diameter 9) Center-to-center

Vehicle compatibility for the Ford Duratec HE 2.0 engine

These forged connecting rods are compatible with the 2.0 16V versions of the Ford Duratec HE engine. They are aimed at builds (big naturally-aspirated, turbo or supercharger conversions) that exceed the loads the stock rod can handle.

OEM reference:

Why it’s the most cost-effective solution?

Investing in forged connecting rods means, above all, protecting the whole engine. A stock rod that lets go almost always destroys the block, the crankshaft and the cylinder head.

For the Duratec HE, the extra cost of forged rods is nothing compared with the price of a full rebuild after a failure. It is the guarantee of a reliable build, able to handle the added power over time.

With their included ARP hardware and the choice between I-Beam and H-Beam profiles, these forged connecting rods offer the best balance of performance, mechanical safety and durability for your Ford Duratec HE.