Mercedes-Benz C111

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After an endurance test in 1970
Suspension layout of Mercedes-Benz C111 with independent multi-link on the rear axle.
C 111-II
C 111-III
C 111-IV

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 multi-link rear suspension, gullwing doors and a luxurious interior with leather trim and air conditioning.

The first version of the C111 was completed in 1969. The car used a fiberglass body shell and with a mid-mounted three-rotor direct fuel injected Wankel engine (code named M950F). The next C111 appeared in 1970. It used a four-rotor engine producing 370 hp (275 kW). The car reportedly could reach a speed of 290 km/h (180 mph). (citation needed)

The company decided not to adopt the Wankel engine and turned to Diesel experiments for the second and third C111. The 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[citation needed], the C111 eventually reached 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. (citation needed, information a little unbelievable)

Mercedes-Benz introduced the C112 at the Frankfurt Motor Show in 1991 as a proposed production sports car. The car used a mid-mounted 6.0 L V12 engine. After accepting 700 deposits, the company decided not to proceed with production.

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