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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 steel, through-hardened, known for its excellent balance of mechanical strength and toughness. It is the reference material for performance forged rods: it resists fatigue and the repeated shocks of the engine cycle. For the most demanding applications, 300M alloy (a silicon-rich derivative of 4340) offers an even higher yield strength. |
 | 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. High-strength alloy steel (around 220,000 psi tensile strength). It is the reference bolt for the vast majority of builds: a comfortable safety margin and excellent value for money. |
 | ARP Custom Age 625+. A premium aerospace alloy (around 260,000 psi), even more fatigue-resistant. Reserved for the highest-output engines, where maximum margin is sought. |
| In addition to torque tightening, measuring bolt stretch with a dedicated gauge ensures precise and consistent bolt tension. It is the method recommended by manufacturers for forged rods: you tighten until reaching the target stretch, a guarantee of a reliable assembly. |
 | Manley Performance. A leading American manufacturer of high-performance engine components. Its Pro Series forged rods, machined from 4340 steel or 300M alloy and fitted with ARP bolts, are renowned for their durability on race and heavily built engines. |
 | 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.
