Mercedes-Benz C111 Concept
The Mercedes-Benz C111 was a series of experimental automobiles produced by Mercedes-Benz in the 1960s and 1970s. The company was experimenting with new engine technologies, including Wankel engines, Diesel engines, and turbochargers, and used the basic C111 platform as a testbed. Other experimental features included gullwing doors and a luxurious interior with leather trim and air conditioning.
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The first version of the Mercedes-Benz C111 was completed in 1969. It used a fiberglass body shell and had a three-rotor direct fuel injected Wankel engine (code named M950F) mounted in the middle. The next C111 appeared in 1970. It used a four-rotor engine producing 370 hp (275 kW). The car could reportedly hit 290 km/h (180 mph).
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The company decided not to adopt the Wankel engine and turned to Diesel experiments for the second and third Mercedes-Benz C111.
The Mercedes-Benz C111-IID produced 190 horsepower (140 kW) and was based on the 240D 3.0 W115 model OM617 engine.
The C111-III was powered by a 230 horsepower (170 kW) @ 4,500rpm straight-5 OM617 turbodiesel which broke nine diesel and gas speed records. With more aerodynamic bodywork that gave it an air drag coefficient of .191, the Mercedes-Benz C111 eventually hit 200 mph (322 km/h) at Nardò in 1978, and averaged 14.7mpg@ 316 km/h (195.4 mph) over a 12 hour cruise. A later 500 hp (372 kW) 4.8 L twin KKK-turbocharged V8 version set another record, with an average lap-speed of 403.78 km/h (250.958 mph). It was achieved by Dr. Hans Leibold in 1 minute, 56.67 seconds on May 5, 1979.
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Mercedes-Benz introduced the C112 at the Frankfurt Motor Show in 1991 as a production sports car. It used a 6.0 L V12 engine mounted in the middle. But after accepting 700 deposits, the company decided not to proceed with production.