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5.2L 40v - V10 FSI
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5.2L 40v - V10 FSI
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Set of 10 forged 4340 steel connecting rods for the V10 5.2 FSI Lamborghini (Gallardo, Huracán) and Audi R8.
The 5.2 FSI V10 developed by the Audi Group powers the Lamborghini Gallardo (from the LP560-4 in 2008) and then the Huracán, as well as the Audi R8 V10 with which it shares its architecture. With a displacement of 5,204 cc (84.5 mm bore, 92.8 mm stroke), this naturally aspirated 90° ten-cylinder with FSI direct injection and 40 valves uses dry-sump lubrication that allows very high engine speeds.
Depending on the version, this engine delivers between 525 and 620 hp and revs beyond 8,000 rpm: the rotating assembly is constantly under very high stress. As soon as power is increased (adding forced induction, switching to ethanol, raising the rev limit), the factory rods become a weak point. Replacing them with forged connecting rods strengthens the bottom end and secures power gains.
Machined from high-strength 4340 steel, and from 300M alloy for the most extreme version, NSB Concept forged connecting rods are sized to withstand the loads of a built V10. Forging aligns the metal grain along the part: at equal dimensions, a forged rod handles far higher loads than a cast one.
They are offered in the I-HD profile (reinforced I-Beam, “Turbo Tuff”) and supplied with their ARP high-performance bolts. Each kit includes the ten rods required for the V10, ready to receive your forged pistons.
| Reference | Brand | Profile | Steel | Bolts | Pin diameter OEM 20 mm | Small-end width | Big-end diameter OEM 56.8 mm | Big-end width | Center distance OEM 154 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|---|
| 14435-10 | Manley | I-HD | Forged 4340 steel | ARP 2000-3/8"-41mm | 20 | 56.8 | 19.4 | 154 | 615 g | |
| 14435R6-10 | Manley | I-HD | Forged 4340 steel | ARP CA625+-3/8"-41mm | 20 | 56.8 | 19.4 | 154 | 615 g | |
| 15435-10 | Manley | I-HD | Forged 300M steel | ARP 2000-3/8"-41mm | 20 | 56.8 | 19.4 | 154 | 615 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| Manley (14435-10) | ARP 2000 | 81.3 N·m | 0.147 – 0.157 mm |
| Manley (14435R6-10) | ARP CA625+ | 88.1 N·m | 0.165 – 0.190 mm |
| Manley (15435-10) | ARP 2000 | 81.3 N·m | 0.147 – 0.157 mm |
Manufacturers recommend tightening rod bolts by stretch measurement rather than torque alone: it is the most accurate method to ensure correct bolt tension on this type of engine. The values above come from the Manley and ARP datasheets.
| 4340 steel is a nickel-chromium-molybdenum alloy, through-hardened, used in aerospace and motorsport for its balance of mechanical strength and toughness. Forged then heat-treated by quenching and tempering, it develops high yield strength, excellent fatigue endurance and real ductility. Against a series sintered-metal rod, optimised for production cost, a forged 4340 rod gains around 19% in yield strength, 8% in tensile strength and 19 to 37% in fatigue resistance, i.e. a service life under cyclic load several times longer. For the most extreme applications, the 300M alloy (derived from 4340, richer in silicon) pushes yield strength and fatigue resistance further still, making it the reference for heavily tuned V10s. |
 | I-HD profile. A reinforced version of the I-Beam (“Heavy Duty”), recognisable by its thicker central section. Manley markets it under the Pro Series “Turbo Tuff” name. Stiffer than a standard I-Beam, this profile is designed for heavily stressed or high-revving engines, where buckling resistance is key. |
The rod bolt is one of the most heavily loaded parts in the engine: it holds the cap clamped onto the crank pin on every revolution. On a built V10, the choice of ARP bolt grade directly determines bottom-end reliability.
 | ARP 2000. A high-strength alloy steel (tensile strength around 220,000 psi, i.e. ~1,517 MPa), it is the reference bolt for most builds: up to 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 constraint. |
 | ARP Custom Age 625+. ARP's premium aerospace alloy (tensile strength of 260,000 to 280,000 psi, i.e. ~1,793 to 1,931 MPa), even more fatigue-resistant. It targets the most extreme builds, beyond 250 hp per cylinder in 3/8" and 10,000 rpm, while offering better corrosion resistance than ARP 2000 and remaining immune to hydrogen embrittlement, without the storage constraints of L19. Ideal for the most stressed rods and cylinder heads. |
| In addition to torque tightening, measuring bolt stretch with a dial indicator is the most reliable check of a correct, repeatable preload. With the bolt fitted, a measuring gauge is placed on the two ends of the bolt and its actual stretch is read, which must match the recommended value (see the torque and stretch table above). By freeing itself from the friction scatter inherent in torque tightening alone, this method secures the bottom-end assembly on heavily loaded engines, such as a tuned 5.2 FSI V10. |
 | Manley Performance. A leading American manufacturer of high-performance engine parts (Wiseco group). Its Pro Series forged rods, machined in 4340 steel or 300M alloy and fitted with ARP bolts, are weighed and matched before delivery, and renowned for their ruggedness on competition and heavily tuned engines, in drag, circuit, rally and 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 are compatible with all vehicles fitted with the 5.2 FSI V10 (shared Lamborghini and Audi architecture), provided suitable forged pistons are used.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Lamborghini | Gallardo LP550-2 / LP560-4 / LP570-4 | CEH / CMPA | 550–570 hp | 2008–2013 |
| Lamborghini | Huracán LP580-2 / LP610-4 | CSJB / DKBA / DGFA | 580–610 hp | 2014–present |
| Audi | R8 (Type 42) V10 5.2 FSI | BUJ / CTYA / CMPA / CTPA / CTPB | 525–570 hp | 2009–2015 |
| Audi | R8 (Type 4S) V10 5.2 FSI | CSPB / DKAB / CSPA / DKAA / DKAC / DMWA / DMWC | 540–620 hp | 2015–present |
OEM reference: 07L198401 (genuine Audi/Lamborghini V10 5.2 FSI connecting rod).
When a factory bottom end lets go (broken rod, spun bearing), the bill for a V10 climbs very fast. Rebuilding with forged rods is not a needless expense: it is the assurance of not having to rebuild the engine twice.
For a budget comparable to a factory assembly, forged rods handle far more torque and rpm. It is one of the most cost-effective investments in a serious engine build.
For the same budget: more reliability, more power potential and real long-term peace of mind.
