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2.8L 24v - B6284T
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2.8L 24v - B6284T
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Set of 6 forged 4340 steel connecting rods for Volvo 2.8L 24V Turbo B6284.
The B6284 belongs to the Volvo modular family, an all-aluminium 2.8-litre straight-six with four valves per cylinder. Mounted transversely in the Volvo S80 T6, it is twin-turbocharged and produces around 272 hp, making it one of the most powerful Swedish saloons of its generation between 1998 and 2005.
Originally engineered for comfort and longevity, this straight-six reaches the limits of its factory rods as soon as boost pressure and power rise. On a built engine that significantly exceeds standard output, the connecting rod becomes the critical link: replacing it with a forged rod is the prerequisite for a reliable power increase, without risking bottom-end failure.
The connecting rod turns the piston's reciprocating motion into the crankshaft's rotation: on every cycle it withstands tensile, compressive and bending loads that grow with engine speed, boost pressure and torque. A forged rod, produced by hot die forging, has an oriented grain flow that gives it far greater fatigue strength than a cast or sintered factory rod.
These ZRP forged rods are intended for built B6284 engines used in competition and intensive use: circuit racing, track days, drift, rally, drag and hillclimb. They secure Stage 2, Stage 3 and Stage 4+ builds, where forged pistons, larger turbos, higher boost and higher engine speed demand a bottom end able to handle power far above stock without compromising reliability.
| Reference | Brand | Profile | Bolts | Pin Ø OEM 23 mm | Small-end width | Big-end Ø OEM 53 mm | Big-end width | Center-to-center OEM 139,5 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-VOL-005-I-6 | ZRP | I | ARP 2000-3/8"-38mm | 23 | 53 | 25,65 | 139,5 | 531 | |
| R-VOL-005-I-6-L19 | ZRP | I | ARP L19-3/8"-38mm | 23 | 53 | 25,65 | 139,5 | 531 |
| Rod | Bolts | Max torque (N·m) | Stretch (mm) |
|---|---|---|---|
| ZRP (R-VOL-005-I-6) | ARP 2000 | 61 | 0,140–0,152 |
| ZRP (R-VOL-005-I-6-L19) | ARP L19 | 67,8 | 0,152–0,165 |
Manufacturers recommend the stretch-gauge method as the reference: the instructions supplied with the kit always take precedence. The torque figures correspond to assembly with ARP lubricant.
4340 is a low-alloy nickel-chromium-molybdenum steel, the benchmark for highly stressed mechanical parts, used even in aerospace. After hot forging, the rods are quenched and tempered to balance hardness and toughness.
Compared with a production sintered metal, forged 4340 offers around 19% more yield strength, about 8% more tensile strength and 19 to 37% greater fatigue endurance depending on loading: extra margin that translates directly into a more reliable bottom end under high load.
 | I-beam profile: an I-shaped section that favours an excellent stiffness-to-weight ratio. Light and stable at high rpm, the I-beam rod is ideally suited to the B6284 straight-six, where controlling moving masses and high-rpm stability come first. |
The rod bolt is the most heavily loaded part of the moving assembly: it keeps the cap closed against inertial forces. The ARP grade is chosen according to the target power per cylinder and engine speed.
 | ARP 2000: tensile strength of about 220,000 psi (~1,517 MPa). It handles up to 150 hp per cylinder in 5/16" and up to 200 hp per cylinder in 3/8", at speeds up to 8,500 rpm. It is the versatile reference choice: strength, reliability and no storage constraints, suited to circuit, track days, drift, rally, drag and hillclimb. |
 | ARP L19: tensile strength of about 260,000 psi (~1,793 MPa), for the most extreme builds (high boost, high power and high rpm). More capable but more sensitive to corrosion and hydrogen embrittlement, it requires particular care in storage and assembly. |
| The most reliable tightening method is to measure bolt stretch with a gauge, between its two ends, rather than relying on torque alone: it eliminates parasitic friction and guarantees exact preload. The target stretch value is given in the manufacturer's instructions. |
ZRP (Zylinshare Racing Parts) is the brand of Alex Drakos, based in Athens, Greece. Its rods are precision-machined from 4340 steel, inspected and weight-matched to within ±1 g for optimal bottom-end balance. They excel in circuit, rally and drift as well as in high-power builds.
Center-to-center: distance between the small-end and big-end centres. I / H profile: shape of the rod beam section. Stretch: controlled elongation of the bolt at tightening, ensuring exact preload. Stage: engine build level, increasing with target power.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Volvo | S80 T6 (TS) | B6284T | 272 ch | 1998–2005 |
OEM reference:
Against the price of a new engine or a full rebuild after failure, a set of forged rods is a modest investment that reliably strengthens the bottom end. It is the part that lets you exploit forged pistons and increased boost without fear of breakage.
By securing the moving assembly from the build stage, you avoid the extra costs of a failure during the power increase: downtime, collateral damage and reassembly. The forged rod is the reliability insurance of a high-performance engine.
