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2.0L 16v - C20XE
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2.0L 16v - C20XE
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Kit of 4 forged 4340 connecting rods for Opel 2.0 16v C20XE / C20LET / Z20LET.
Opel/Vauxhall’s 2.0 16-valve belongs to the well-known GM Family II. This inline four-cylinder of 1998 cc (86.5 mm bore, 86 mm stroke) first appeared as a naturally aspirated unit, the famous 150 hp C20XE « Red Top », then in several turbocharged variants (C20LET, Z20LET, Z20LEH, Z20LER, Y20LET). They all share the same sturdy bottom end and the same original connecting rod, which is why they can be grouped under a single forged reference. Built from 1988 to 2010, these engines powered nearly twenty years of sporty Opels.
In naturally aspirated form the C20XE delivers around 150 hp; the turbo versions climb from 190 to 240 hp depending on the year (C20LET 204 hp in the Calibra Turbo 4x4, Z20LET 190 to 200 hp in the Astra G OPC, Z20LEH 240 hp in the Astra H OPC and Vauxhall VXR). Praised for the strength of its crankshaft and block, this 2.0 16v is a highly sought-after tuning base for rally, circuit and drift. As soon as boost pressure or engine speed rises, however, the original rod becomes the weak link, which is exactly where forged connecting rods come in.
Forged from high-strength 4340 steel, these reinforced rods protect the bottom end as soon as the build goes beyond stock. They are essential for any forged-piston setup, any increase in boost pressure (Stage 1, Stage 2, Stage 3 and beyond) and any sustained competition use: rally, drift, drag, circuit, hillclimb or time attack. Where the sintered original rod bends or breaks under cylinder pressure and high revs, the forged rod takes it without flinching and allows significant, reliable power gains.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 21 mm | Small-end width | Big-end diameter OEM 52 mm | Big-end width | Center-to-center OEM 143 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-OPE-001-H | ZRP | H | ARP 2000-3/8"-38mm | 21 mm | 52 mm | 26,35 mm | 143 mm | 514 g | |
| R-OPE-001-H-L19 | ZRP | H | ARP L19-3/8"-38mm | 21 mm | 52 mm | 26,35 mm | 143 mm | 514 g | |
| R-OPE-001-I | ZRP | I | ARP 2000-3/8"-38mm | 21 mm | 52 mm | 26,35 mm | 143 mm | 532 g | |
| R-OPE-001-I-L19 | ZRP | I | ARP L19-3/8"-38mm | 21 mm | 52 mm | 26,35 mm | 143 mm | 532 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| ZRP (R-OPE-001-H) | ARP 2000-3/8"-38mm | 61 N·m | 0,140 – 0,152 mm |
| ZRP (R-OPE-001-H-L19) | ARP L19-3/8"-38mm | 67,8 N·m | 0,152 – 0,165 mm |
| ZRP (R-OPE-001-I) | ARP 2000-3/8"-38mm | 61 N·m | 0,140 – 0,152 mm |
| ZRP (R-OPE-001-I-L19) | ARP L19-3/8"-38mm | 67,8 N·m | 0,152 – 0,165 mm |
Manufacturers recommend the stretch-gauge method as the reference: the instructions supplied with the kit always take precedence. The torque figures shown apply to assembly with ARP lubricant.
| 4340 is a chrome-nickel-molybdenum alloy steel widely used in aerospace and motorsport. Forged and then heat-treated (quenched and tempered), it combines excellent mechanical strength with good ductility. Compared with a factory rod, usually sintered metal optimised for production cost, a forged 4340 rod gains roughly 19% yield strength, 8% tensile strength and up to 19-37% fatigue resistance, translating into a markedly longer service life under repeated loads. This is why forged 4340 is the reference once revs or the build step up. |
 | H-beam profile. Made of two flat flanks joined by a central web, the H-beam offers high rigidity and excellent resistance to compression. It is the preferred choice for high-torque, high-boost engines where sturdiness comes first. |
 | I-beam profile. Its thinner central section lightens the rod and reduces reciprocating inertia, which favours quick revving and responsiveness. Versatile, it is valued on engines that prioritise efficiency and high rpm. |
The rod bolt is one of the most heavily stressed parts of the engine. The ARP grade should match the intended power output, and the prescribed torque and stretch must be followed precisely.
 | ARP 2000 (tensile strength around 220,000 psi, ~1,517 MPa) is ARP's high-performance standard. Suited to builds up to 200 hp/cylinder in 3/8", and up to 8,500 rpm, it is the most widely used bolt on track, trackday, drift, rally, drag and hillclimb: tough, reliable, versatile, with no special storage requirement. |
 | ARP L19 (tensile strength around 260,000 psi, ~1,793 MPa) targets extreme builds, up to 250 hp/cylinder in 3/8", and up to 10,000 rpm: heavy boost, sustained high revs, high cylinder pressure. It is the choice for big-power builds and drag racing. Prone to oxidation, the L19 alloy needs careful, oiled storage. |
| In addition to torque tightening, measuring rod-bolt stretch remains the most reliable check for achieving optimal preload. With the bolt fitted, a gauge (dial indicator) is placed at both ends and the actual stretch is read, which should match the value in the table above. This method removes the friction variation inherent to torque tightening and makes assembly more reliable on heavily loaded engines. |
 | ZRP is a Greek brand of high-performance forged connecting rods created by Alex Drakos in Athens. Each rod is forged from 4340 steel, precision-machined and balanced to ±1 g for reliability at high rpm. Offered here in I-beam profile with ARP 2000 or L19 bolts, it is developed and controlled in Greece, proven in rally, on circuit and in drift. |
 | 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 |
These forged connecting rods fit the following Opel/Vauxhall 2.0 16v engines, both naturally aspirated and turbocharged:
| Make | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Opel / Vauxhall | Astra F GSi (T92) | C20XE | 150 hp (110 kW) | 1991–1998 |
| Opel / Vauxhall | Kadett E GSi (T85) | C20XE | 150 hp (110 kW) | 1988–1991 |
| Opel / Vauxhall | Calibra (C89) | C20XE | 150 hp (110 kW) | 1990–1994 |
| Opel / Vauxhall | Vectra A (J89) | C20XE | 150 hp (110 kW) | 1990–1995 |
| Opel / Vauxhall | Calibra Turbo 4x4 (C89) | C20LET | 204 hp (150 kW) | 1992–1997 |
| Opel / Vauxhall | Vectra A Turbo 4x4 (J89) | C20LET | 204 hp (150 kW) | 1994–1995 |
| Opel / Vauxhall | Astra G OPC (T98) | Z20LET | 190–200 hp | 2000–2005 |
| Opel / Vauxhall | Zafira A OPC (T98) | Z20LET | 192–200 hp | 2001–2005 |
| Opel / Vauxhall | Speedster / VX220 (E01) | Z20LET | 200 hp (147 kW) | 2002–2006 |
| Opel / Vauxhall | Astra H OPC / VXR (A04) | Z20LEH | 240 hp (177 kW) | 2005–2010 |
| Opel / Vauxhall | Zafira B OPC (A05) | Z20LEH | 240 hp (177 kW) | 2006–2012 |
| Opel / Vauxhall | Astra H / Zafira B (A04/A05) | Z20LER | 200 hp (147 kW) | 2004–2014 |
OEM reference: 9117765 (set of 4 connecting rods).
When a factory rod breaks, bends or scores, a simple return to stock spec forces replacement of both the rods and the pistons, which are often damaged together: the bill quickly rises just to get back to factory performance. For a comparable, or even lower, budget, forged 4340 rods paired with forged pistons deliver far greater safety margin and reliability, plus genuine headroom for future power. It is the solution European tuners have chosen for more than fifteen years: for the same budget, more reliability, more potential, more longevity.
