Audi And Lamborghini's Final Naturally Aspirated V10 Took 6 Hours To Build By Hand

In the Hungarian town of Győr, Audi once built one of its most impressive modern-day production engines: the 5.2-liter V10. Audi and Lamborghini used the engine in models like the R8 and the Huracan, respectively. Each one of those V10s had about 250 individual parts. According to Audi, workers could produce roughly 19 engines per shift.

The 5.2-liter V10 engines destined for road use underwent some bench testing, whereas those slated for racing use received substantially more evaluation. During those tests, the company would push the mill right up to its limit, which maxed out at 8,700 rpm. For perspective, that engine speed means each piston travels about 88 feet per second. The V10 has since been discontinued, but before that, it created an 8,700-rpm buzz throughout the industry.

One Factory, One Engine, Two Supercars

The 5.2-liter V10 started life as a 5.0-liter mill, first introduced in the 2003 Lamborghini Gallardo. Volkswagen, Audi's parent company since 1966, purchased Lamborghini in 1998. The V10 represented the first joint project between the two brands. In 2006, the larger 5.2-liter version hit the market. Between Audi and Lamborghini, the mill shared roughly 75% of its internal components across both brands.

At the same time, Audi was determined to keep the engine's character distinct between both brands. This meant that the R8's powerplant wouldn't sound or feel like the Gallardo's, and vice versa. Even though the Győr plant could churn out 19 examples of the 5.2-liter V10 per day, each individual engine still needed about six hours of skilled labor to fit all 250 parts together correctly.

With a certain amount of mass-production coupled with hand-built prowess and a majority of shared parts, Audi was able to make the finances behind the 5.2-liter mill work. On one hand, it could market the engine as an exotic, Italian powerhouse with loads of pedigree backing it up in the Lambo. In the Audi, it could be positioned as a more restrained, but still venerable, powerplant.

Keep in mind, the V10 was far more complex than a normal mass-production engine. It came equipped with four camshafts, 40 valves, and a high-strung, naturally aspirated operation. Few powerplants have ever boasted those sorts of component totals, and even fewer were truly mass-produced.

Despite the engine's complexity, Audi still managed to semi-mass-produce an engine that looked, felt, and sounded exotic, even if it was screwed together in Hungary.

Forget Horsepower, The V10's Most Extreme Number Was Displayed On The Tachometer

It might sound silly, but the engine's 8,700-rpm redline is even more impressive than you might think, especially when paired with its highest factory-rated horsepower of about 630 hp. The V10 can spin that fast thanks to a 3.65-inch piston stroke and 3.33-inch bore. At 8,700 rpm, each piston is traveling at roughly 26.9 meters per second, and that takes a toll on the powerplant.

The engine's pistons, connecting rods, crankshaft, and bearings are put under extreme strain when the driver's right foot demands a full-throttle run. Supporting those components are things like lubrication and the engine's cooling system, both of which are called to work overtime, too. Without forced induction, high revs are essential for making large amounts of power.

A naturally-aspirated engine also behaves quite differently than one that's turbocharged. For example, there's no turbo lag, meaning that power is available immediately. There's also a linear relationship between throttle input and acceleration, leaving no room for surprises when exiting corners. As the revs climb through the range, engine power keeps increasing.

The 5.2-liter V10 employs an uncommon firing interval of 54 and 90 degrees as the crankshaft turns. While this doesn't bode all that well for smoothness, it gives the engine its signature sound and characteristic feel. Reviewers from the period described the powerplant as having particularly sharp throttle response.

The Audi 5.2-liter V10 was no yokel in a suit just because it didn't use any turbochargers. Its cylinder heads had titanium valves, along with CNC-machined intake ports. The ECU was finely tuned for maximum performance with the lowest possible emissions, and some of its rotating assembly was made from lightweight materials, such as using forged aluminum pistons.

It Only Took Six Hours To Build Something Modern Turbo Engines Can't Touch

Think about it. In six hours, most of us might clean the bathroom and then doom-scroll for the rest of the ti e. In that same period. Audi engineers hand-built an entire supercar engine from the block. Once each road-going engine was complete, it underwent about 90 minutes of hard bench testing. Evaluating each engine immediately after assembly meant Audi treated these engines as precision, finely tuned instruments rather than stamp-and-press mass-production motors.

Without a turbocharger, the V10 needed a bit more fine-touch attention. Normally, a turbocharger can help compensate for changes in airflow within an engine. Without it, the engine has to fend for itself if the air intake flow gets upset by something like excessive heat. Also, in a naturally aspirated engine, throttle response depends directly on intake and combustion behavior. Each engine also has to breathe correctly at high rpm.

Achieving a high specific output, or how much power an engine makes per liter, depends on a lot of things in a performance engine. In the Audi V10's case, its lubrication and friction control needed to be highly refined. It uses a dry-sump oiling system, wherein the oil is stored in a separate tank and fed into the engine. The setup is great for racing applications, as there's less chance of oil starvation under heavy cornering or acceleration. Technology such as piston skirt electro-coating, Alusil cylinder liners, and roller cam followers helped to reduce friction, as well.

Some of those solutions are very scientific, as most of the 5.2-liter V10's personality seems to be. However, Audi utilized old-fashioned, skilled labor to hand-assemble the powerplants, possibly combining the best of both worlds.

The Temerario Makes The V10 Look Obsolete, But Also Doesn't

Even though many people loved the 5.2-liter V10, Audi had to retire the powerplant. Its final year in production wrapped up in 2024, and it was last installed in the Audi 8. These days, emissions compliance, power-density metrics, and electrification are what drive exotic supercar engines. While the engineering behind these new ones is respectable in its own right, the 5.2-liter V10's self-reliance is something that the modern world will likely never see again.

The new Lamborghini Temerario stormed onto the scene as the Huracan's replacement. With it came an all-new powerplant: a twin-turbo 4.0-liter V8. It comes with three electric motors, a flat-plane crankshaft, and an eight-speed dual-clutch transmission. With the motors working alongside the engine, the Temerario can produce 907 hp without missing a beat, with the engine alone making up 789 p. It can even rev up to 10,000 rpm.

That's impressive, and the new engine uses many of the now-defunct 5.2-liter V10's best qualities. It's capable of high revs, impressive horsepower from the engine alone, and relatively low torque due to its oversquare, flat-plane-crank design. The three electric motors provide some of the power, with a pair on the front axle and one between the engine and transmission. They provide immediate torque while the turbocharged engine builds power.

In short, Lamborghini used technological prowess to solve some issues the 5.2-liter V10 had built into its design, such as low-end torque. But, you don't get that signature sound, immediate, mechanical throttle response, or mechanical complexity the old 10-pot had.

Yes, the Temerario and its engine are better than the old V10 in virtually every measurable way. But if you so much as hear a 5.2-liter scream by you at full throttle, you won't care.