Lamborghini is close to revealing its successor to the top-selling Huracán supercar, and the automaker on Monday presented the first details on the car's newly developed powertrain.

The new model is code-named the 634, and based on recent trademark activity might carry the Temerario name into production. Prototypes spied testing hint at a design that's a significant departure from the Huracán's styling.

Lamborghini on Monday confirmed the car will feature a plug-in hybrid powertrain with a twin-turbocharged 4.0-liter V-8 as the internal-combustion component. The engine will deliver 791 hp between 9,000 and 9,750 rpm. It's also said to have a flat-plane crankshaft and the ability to rev all the way to 10,000 rpm. In other words, it should sound great.

Compared to typical cross-plane designs, flat-plane V-8s rev higher and tend to be louder and not as smooth. As a result they are normally found only in motorsports and high-performance road cars, including from Ferrari and in the latest Chevrolet Corvette Z06.

Lamborghini Huracán successor's twin-turbocharged 4.0-liter V-8

Lamborghini Huracán successor's twin-turbocharged 4.0-liter V-8

The Huracán successor's V-8 will deliver a peak torque of 538 lb-ft from 4,000 rpm all the way up to 7,000 rpm. Lamborghini said the car's electrification will help provide torque fill to ensure power delivery is progressive like that of a racing engine.

Like the recently launched Revuelto V-12 plug-in hybrid supercar, the Huracán successor will also feature a trio of electric motors. Two will be mounted up front to independently power the front wheels, while the third will be sandwiched between the mid-mounted V-8 and transmission, in this case the 8-speed dual-clutch automatic found in the Revuelto. The transmission will likely be transversely mounted, which is how it is mounted in Lamborghini's latest V-12 supercar.

Lamborghini has yet to reveal full details on the complete powertrain of the Huracán successor but said the rear electric motor will generate 147 hp. Some electric driving range should be possible: it's likely the car will also adopt the Revuelto's 3.8-kwh lithium-ion battery.

The Huracán successor will be revealed later this year, with rumors pointing to a debut in August. With the Urus also going the plug-in hybrid route, Lamborghini will soon be a fully electrified brand. The automaker is also working on its first electric vehicle. It was previewed by last year's Lanzador concept and is due around 2028.