"It's impossible!" argued father Gianfranco Dini and son Leonardo, but once again, Gianfranco wanted to show his over-enthusiastic offspring who possessed the mechanical know-how in the family.

The young Dini's mistake was to suggest to his father—a master mechanic and founder of the legendary Oemmedi Meccanica—that he should shoehorn a Porsche 911 flat-six motor into the rear of a 1970s Fiat 500. The challenge had been issued, and in true father/son rivalry, there was no backing down.

The exchange took place more than a decade ago, and the Porsche-engined Cinquecento has since been parked. Not because it didn't work, but because the old saying "Madness is hereditary; you get it from your children" runs particularly deep in this family.

You see, after building the Frankenstein Fiat/Porsche 500 and thus upholding his honor as a red-blooded Italian male, Signore Dini succumbed to a madness of his own making: he began work on a second car. This time, he eschewed the "foreign" motor for the flat-plane-crank V8 from a Ferrari 308, installed transversely in the 500's rear.

By the time we arrived at Oemmedi Meccanica's workshop on the outskirts of Tuscany, the Ferrari-engined Cinquecento had already been eclipsed by an even madder creation.

As we walked the line in a corner of the workshop, it was apparent that while the gray, Porsche-engined machine didn't look too radical from the outside, the black, Ferrari-engined version definitely had the overtones of a pumped-up racer.

What we weren't prepared for was the car at the far end of the line. The sheer scale of the changes that this poor, unsuspecting 40-year-old Fiat 500 endured in the creation of Signore Dini's latest work left us speechless.

It was immediately obvious that the physical size of a 580hp Lamborghini Murcielago motor stuffed into the rear of the car had required a radical rethink of its structure and external appearance. This is, with no exaggeration, a very small car built around a very big engine.

"It was the result of a bet," Dini Senior confirmed. "Some smartass in Northern Italy, who knew about my two previous cars, suggested I put a 6.2L Lamborghini V12 into a Cinquecento. Ten years ago, I'd have laughed it off, but after my experience with the other two cars, it was a challenge I accepted with relish," he explained.

It wasn't easy, of course, but two years and 3,000 man-hours later, the Lambocento was rolled into the Italian sunshine.

12-into-500

Since the Fiat 500 was inherently too short and narrow for the Lamborghini drivetrain, the specification called for both the wheelbase and track to be significantly extended. The result: a car nearly twice as wide as the original Fiat, with the hub centers of the huge Murcielago wheels now practically where the front and rear bumpers would sit on a stock 500.

A tailored space frame chassis was fabricated. It incorporated a subframe cradle to mount the engine and transmission. Significant torsional reinforcement came from the steel bulkheads front and rear, as well as a steel floorpan, whose box-section transmission tunnel acted as the car's backbone.

The relevant parts of the '71 Fiat 500 monocoque—in effect the side panels, roof, and its pillars—were welded to the new chassis and all the new body parts, including the huge wheel arches, were fabricated from steel.

As Gianfranco is allergic to plastic, the entire dashboard and center console were also fabricated from steel plate and covered in leather, further reinforcing the scuttle. Even the door mirrors are handmade from steel.

There was no way the car would be able to deploy 580 hp through its rear wheels alone, so Lamborghini's AWD transmission was adapted in its entirety, with a shortened propshaft and custom driveshafts.

The car has a flat bottom for aerodynamics, with cutouts to aid ventilation of the finned sump and gearbox, and an air diffuser at the rear under the stainless steel Lamborghini exhaust silencer.

The double wishbone suspension uses modified coilovers all round and an anti-roll bar at either end. The rear units are inclined 45 degrees and mounted to pickup points on the rear subframe, while the fronts are inclined at about 10 degrees and their top mounts are connected by a tubular steel strut brace.

The brakes are the Murcielago's 355mm rotors all around with four-piston calipers and even the working ABS system. There's also a giant Lamborghini master cylinder up front, taking up almost half the space in the tiny front compartment.

Details like the electrically opening engine cover and retractable rear spoiler add to the car's overall finesse, and you can't help but admire the attention to detail, even if some of it falls more on the practical side than the stylish.

By , Thomas Geiger
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