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  Mazda 767B      

  Article Image gallery (53) Chassis (3) Specifications Video (1)  
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Country of origin:Japan
Produced in:1989
Numbers built:3
Designed by:Nigel Stroud for Mazdaspeed
Successor:Mazda 787
Author:Wouter Melissen
Last updated:August 15, 2016
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Click here to download printer friendly versionThe distinct howl of Mazda's rotary engine was first heard at Le Mans in 1970, when a Chevron B16 was entered by the Japanese manufacturer. The company remained a regular even though the ultimate goal of an outright victory in the 24 Hours was never within grasp. By the mid-1980s, the program received new impetus with the arrival of English designer Nigel Stroud, who created the all-new 757 for the 1986 season. It was superseded in 1988 by the outwardly similar but re-engined 767.

What set the 767 apart from its predecessors was the adoption of a new version of the production-derived Type 13 rotary engine. Known as the 13J, it featured no fewer than four combustion chambers, good for a swept displacement of 2,616 litre. Using the four-stroke equivalency formula, this represented a displacement of 5,232 litre. At around 9,000 rpm, the unique engine produced around 600 bhp, which was a significant increase over the 450 bhp produced by the three-rotor Type 13G. As before, a modified Porsche five-speed gearbox was used.

To accommodate for the longer engine, Stroud had to modify his chassis design. Wholly conventional, it was built around a monocoque constructed from aluminium sheets, reinforced by honeycomb core. Suspension was double wishbones all around with in-board mounted springs and dampers to allow for the largest possible ground-effect tunnels. It was clothed in a lightweight body constructed from carbon-fibre and Kevlar composites. Designed to run in the IMSA GTP class, the 767 was balasted to tip the scales at 800 kg.

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  Article Image gallery (53) Chassis (3) Specifications Video (1)