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2.0L 16v - HF Integrale
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2.0L 16v - HF Integrale
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Set of 4 forged 4340 steel connecting rods for the Lancia Delta Integrale and Fiat Coupé 16V Turbo.
The 2.0 16V Turbo unit of the Lancia Delta HF Integrale (codes 831, 832CS, M16AT) is an inline four-cylinder of 1,995 cc with 16 valves, fed by a turbocharger (84 mm bore, 90 mm stroke). Built from 1989 to 1994, it made the Integrale a rally legend and remains a benchmark for engine building.
Beyond the original dimension, some builds call for a longer centre distance to revise the rotating-assembly geometry. This page covers the ZRP forged connecting rods with a 149 mm centre distance (+4 mm), intended for specific builds of the Delta Integrale and Fiat Coupé 16V Turbo, where the original rod quickly reaches its limit under hard use.
Forged from 4340 nickel-chromium-molybdenum steel, these rods are far stronger than the standard sintered rods. The forging process aligns the metal grain and gives the part endurance built for the stresses of forced induction.
This version features a 4 mm longer centre distance (149 mm) and aluminium silicon-bronze small-end bushings. It is intended for specific builds: use bearings suited to the 8-valve engine. Each rod is shot-peened, inspected, balanced and supplied with its ARP bolts.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 22 mm | Small-end width | Big-end diameter OEM 53.9 mm | Big-end width | Center-to-center OEM 145 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-LAN-002HL | ZRP | H | ARP 2000-3/8"-38mm | 22 mm | 53.9 mm | 25.7 mm | 149 mm | 534 g | |
| R-LAN-002HL-L19 | ZRP | H | ARP L19-3/8"-38mm | 22 mm | 53.9 mm | 25.7 mm | 149 mm | 534 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| ZRP (R-LAN-002HL) | ARP 2000 | 61 N·m | 0.140 – 0.152 mm |
| ZRP (R-LAN-002HL-L19) | ARP L19 | 67.8 N·m | 0.152 – 0.165 mm |
Manufacturers recommend stretch-gauge checking rather than torque alone; the kit instructions take precedence. The quoted torque values apply to assembly with ARP lubricant.
| 4340 is a low-alloy nickel-chromium-molybdenum steel, valued in aerospace and motorsport alike for its balance of strength and toughness. Forged then hardened by quenching and tempering, it exceeds the original sintered metal by about 19% in yield strength, 8% in tensile strength and 19 to 37% in fatigue endurance, i.e. a service life under cyclic load several times longer. That margin is why it stands as the reference material for connecting rods as soon as boost and engine speed climb. |
 | H-Beam profile. Its two open flanks maximise rigidity and resistance to bending as well as to extreme combustion pressures. Slightly heavier than an I-Beam, it favours strength: the choice for high-torque builds, very high cylinder pressures and drag use, and it is the natural fit here on this long-centre 149 mm version. |
Working in tension on every cycle, the connecting-rod bolt is one of the engine's most stressed parts: it must keep the cap closed under inertia loads. Two ARP grades are offered, from the most versatile to the most demanding; simply match it to the intended build level, then respect the fitting torque and stretch.
 | ARP 2000 (tensile strength around 220,000 psi, i.e. ~1,517 MPa) is the high-performance reference. It covers builds up to 150 hp per cylinder in 5/16" or 200 hp per cylinder in 3/8", and up to 8,500 rpm. Rugged, reliable and versatile, it is used on track, trackday, drift, rally, drag and hill climb, with no particular storage precaution. |
 | ARP L19 (tensile strength around 260,000 psi, i.e. ~1,793 MPa) targets extreme configurations. It accepts up to 200 hp per cylinder in 5/16" or 250 hp per cylinder in 3/8", and up to 10,000 rpm, under high boost and very sustained revs. Sensitive to corrosion and hydrogen embrittlement, it is fitted and stored oiled, away from moisture. |
| Beyond torque tightening, measuring bolt stretch with a dial indicator is the most reliable check of an exact, repeatable preload. With the bolt fitted, the dial indicator is applied to the two ends of the bolt and the actual stretch is read, which must reach the recommended value (see the torque and stretch table above). By neutralising the friction scatter inherent in torque tightening alone, this method secures the bottom end of heavily loaded engines, such as a tuned long-centre Delta Integrale 16V. |
 | ZRP, a Greek brand of high-performance forged connecting rods by Alex Drakos in Athens. Each rod is forged in 4340 steel, precision-machined and balanced to ±1 g to stay reliable at high rpm. Designed and inspected in Greece, proven in rally, on track and in drift, this Delta Integrale version comes in H-Beam profile, 149 mm centre distance, with ARP 2000 or ARP L19 bolts. |
 | 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 |
Rods intended for the 2.0 16V Turbo engine of the Delta Integrale and Fiat Coupé Turbo, for longer-centre-distance builds. Check your engine code and build configuration before ordering.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Lancia | Delta HF Integrale 16V (831) | 831 | 200 hp | 1989–1991 |
| Lancia | Delta HF Integrale Evoluzione (831) | 831 | 210 hp | 1991–1992 |
| Lancia | Delta HF Integrale Evoluzione II (831) | 831 | 215 hp | 1993–1994 |
| Fiat | Coupé 2.0 16V Turbo (175) | 175 A1.000 | 190 hp | 1993–1996 |
OEM reference:
When an original bottom end gives way (a broken, bent or scored rod), going back to the standard configuration often means replacing the rods and the pistons together, frequently damaged at the same moment: the bill climbs fast for a mere reset, without fixing the underlying weakness.
For an equivalent budget, sometimes lower, 4340 forged connecting rods combined with forged pistons deliver lasting reliability and a real safety margin, with genuine power-evolution potential, without reopening the engine at every step. It is the choice of European tuners for over fifteen years.
More reliability, more potential, more longevity for the same spend: the rational way to build a Delta Integrale engine that lasts.
