Missed Glory - Before the 2nd World War, Renzo Rivolta had already established a successful refrigerator manufacturing company named Isothermos. In the 1940s, the business shifted into the production of scooters under the Iso brand. This venture later expanded into the development of the small-engined bubble car, the Isetta, produced between 1953 and 1955. Although Iso ceased production afterward, the Isettacontinued under license in other countries until 1964.
The Iso Grifo 90 was appeared with a sleek body lines and intended to mark the Iso's brand reviving in the 1991. (Picture from: OldCarConcept)
After a delay in developing its next automobile, the company eventually entered the four-wheeled vehicle market with a completely different approach. The result was the Iso Rivolta, a rear-wheel-drive saloon with two doors and four seats, powered by a Chevrolet-sourced 5,359 cc V8 OHV engine. Designed by Giotto Bizzarrini and styled by Carrozzeria Bertone, the model set the tone for Iso’s future identity.
The Iso Grifo 90 is designed by Marcello Gandini with the chassis and powertrain developed by Gian Paolo Dellara. (Picture from: OldCarConcept)
Soon after, Iso’s Milan-based factory introduced the Grifo, followed by the Fidia in 1967. The final production model from the brand wasthe Lele. In 1966, company founder Renzo Rivolta passed away, and control of the business was taken over by his son, Piero Rivolta.😭
The Iso Grifo 90 has certain changes to the interior so that the potential customers would feel like they were sitting in a very special car. (Picture from: OldCarConcept)
Entering the 1970s, Iso made a critical misstep by deciding to compete in the Formula One with Frank Williams. Unfortunately, this decision came at a time when the company was already financially strained, compounded by the global oil crisis. These combined challenges ultimately led to the collapse of the Iso brand in 1975.
The Iso Grifo 90 prototype is based on the Corvette C5 Z06 with the aluminium body was fitted to a tubular steel chassis frame, so it weighs only 1,200 kg. (Picture from: OldCarConcept)
In the late 1980s, Piero Rivolta, together with Piero Sala, attempted to revive the marque with a new GT model. They commissioned Gian Paolo Dallara to develop its chassis and powertrain, while Marcello Gandini was tasked with the design. The result was the Iso Grifo 90, which incorporated the styling cues of the 1990s. The prototype was unveiled to the press in 1991, with plans for limited production beginning in 1994.
The Iso Grifo 90 prototype is powered by a front mounted turbocharged 5.7-litre Chevrolet V8 engine (tuned by Callaway). (Picture from: OldCarConcept)
However, the prototype presented was incomplete—it lacked an engine, a functional interior, and even usable wheels. Due to insufficient funding, the project was suspended. The model remained dormant until 2007, when Federico Bonomelli, owner of the “Mako-Shark” composite materials company and an Iso Rivolta collector, rediscovered the original mock-up. Together with his brother, Bonomelli redesigned the car and obtained approval from Piero Rivolta to build a series of 12 units ofthe Iso Grifo 90.
Federico Bonomelli posed along with one of the classic and rare cars of his owned, the Iso Grifo 7Litri. (Picture from: AutoClassMagazine)
The new prototype was based onthe Corvette C5 Z06. It featured an aluminum body mounted on a tubular steel chassis, resulting in a weight of only 1,200 kg. Power came from a front-mounted, turbocharged 5.7-liter Chevrolet V8 engine tuned by Callaway, producing 490 hp. This was paired with a six-speed gearbox, Brembo brakes, and a locking differential. The car was expected to exceed 300 km/h and accelerate from 0 to 100 km/h in just 4.5 seconds.
The rolling prototype of the Iso Grifo 90was completed in 2010. However, the global economic crisis at the time diminished enthusiasm for the project. As a result, Bonomelli decided not to proceed with the full 12-car production run. Thus, Iso’s modern GT effort once again fell victim to unfortunate timing.😐 *** [EKA [21092021] | FROM VARIOUS SOURCES | CARTYPE | OLDCONCEPTCARS | AUTOCLASSMAGAZINE | CURVES-MAGAZIN | CALLAWAY | DYLER ]
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The rolling prototype of the Iso Grifo 90 was completed in 2010. However, the global economic crisis at the time diminished enthusiasm for the project. As a result, Bonomelli decided not to proceed with the full 12-car production run. Thus, Iso’s modern GT effort once again fell victim to unfortunate timing.😐 *** [EKA [21092021] | FROM VARIOUS SOURCES | CARTYPE | OLDCONCEPTCARS | AUTOCLASSMAGAZINE | CURVES-MAGAZIN | CALLAWAY | DYLER ]
