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While the Ferrari GTO was heralded for winning the Division 3 World Touring Car Championship, the Fiat Abarth OT 1300 nearly matched its performance in Division 1. This small car won the most victories for Abarth including the 1966 and 1967 World Championships.

Based on Simca parts, the OT 1300 used a heavily modified version of its chassis. Engineer Mario Colucci was responsible for the design which used a modified Simca 1000 floor pan. Attached to this were new front and rear sections that supported independent suspensions and modified Fiat 850 components.

The engine was designed from the ground up, but was similar to the Simca 1.3-liter they had raced in previous years. It was built at Corso Marche and by Luciano Fochi who had already designed the 1.6 and 2.0-liter units. Hallmarks of the engine included five main bearings, twin overhead cams and twin choke Weber carburetors.

The whole car was covered in a sleek fiber glass body that was penned Mario Colucci and fabricated at Sibona & Basano of Turin. Upfront was a large opening to feed air to a radiator which was then extracted out the top of the hood. Both the front and rear sections were hinged and provided ample access to the running gear.

Between May 1965 and March 1966, over 50 examples of the OT 1300s were made to satisfy homologation requirements. It replaced the Abarth Simca 1300 but raced in the prototype class until homologated in May of 1966. During the season, the OT 1300 racked up 37 points towards the Constructor’s Championship.

In 1967, the design was updated starting with the chassis which was widened. Probably the most distinctive touch was the addition of a roof-mounted scoop which fed the carburetors fresh air. At the rear were many changes including larger Plexiglas rear window and a very small spoiler.

Overall both the series I and series II OT 1300s were very successful. They won the 1966 and 1967 Division 1 Grand Touring World Championship and the 1966, 67 and 68 Group 4 Italian Championship.

Bibliography and Further Reading

Braden, Pat & Schmidt, Greg. Abarth Fiat Simca Porsche Street Race Record, Osprey, United Kingdom: 1983.

Cosentino, Alfred. Abarth Guide, Nigensha Publishing, Japan: 1984.

Greggio, Luciano. Abarth, the man, the machines, Giorgio Nada Editoire, Italy: 2002.

Story by Richard Owen for Supercars.net