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OS Giken’s TC24-B1Z Super Engine at SEMA 2013

The Fabled Unicorn of Z

Scott Tsuneishi
Nov 8, 2013

The true meaning of rarity doesn’t even come close, when describing what OS Giken displayed at this year’s 2013 SEMA. It was back in the late seventies, Osamu Okazaki from OS Giken decided to convert what was then one of Nissan’s most popular engines, an L-Series straight-six engine into a true high performance power plant back. In 1976 the premise of a high power and high rpm were two of the main goals for Osamu’s project, which was based around an aluminum twin-cam head design at a cost of 20 million yen.

Dubbed the OS Giken TC24-B1, the engine originated from the TC16, a twin-cam head for the four-cylinder L-series engines found in Datsun Bluebird 510s. The increased stroke, 86 mm over the stock 79 mm and the bigger piston diameter of 89 mm, bump capacity to 3,208 cc. What you see before you is an updated model that Okazaki-san reengineered over the years. This twin-cam L-Series engine with an 11.5:1 compression ratio has the ability to churn out 10,000 rpm and boasts in excess of 400hp and 289 lb-ft of torque in its naturally aspirated form The TC24-B1Z is rumored to be back in production, although rumored to be one of only nine engines to ever be built at a mind blowing price of 30K USD. We can all dream right?

By Scott Tsuneishi
247 Articles

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