C111IId and C111III details from Mercedes Mercedes Forum Mercedes…

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Mercedes-Benz C111

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Date:

2008

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C 111-III record-setting car Stuttgart. at midnight on April 30, 1978, the pistons in the diesel engine of the C 111-III began to work, by an intercooled exhaust gas turbocharger at 130,000 revolutions per minute, enough air into the combustion to boost the output to 169 kW/ 230 hp . That was than enough power for the Mercedes-Benz in record-hunting trim to a top of around 325 km/h. Because of its “long” ratio, the car did take its however – a complete 12.66 lap of the circuit in Nardo in southern to be precise — to reach speed.

A Wankel engine for production?

What sort of were the Mercedes-Benz experimental C 111 to C 111-IV? In the late nineteen-sixties, the engineers had set their sights on the Wankel engine on which was working at the time with the aim of incorporating it in production cars. The C 111 was to as a research car for testing Wankel new suspension components for wider through to racing tires and bodywork components. In addition, the C 111 was to improve the aerodynamic efficiency of road-going cars.

The three-rotor engine in the first C 111 of 1969 206 kW/ 280 hp, giving the car a top speed of around 260 The Daimler Communications, 70546 newcomer set out on its first tests in on the Hockenheimring and the Nьrburgring in April and May The suspension featured anti-squat and control; its front axle were incorporated in large-scale at a later stage and the rear was a precursor of today’s multi-link rear suspension. On the basis of the gained in testing this another five experimental were built. They all the level of comfort with a road-going Mercedes-Benz sports car spoil its buyers. The experimental were shown to journalists, and contemporary VIPs at the time of the IAA, albeit at a different Only five months an experimental car designated C 111-II was with a four-rotor Wankel with an output of 258 kW/350 hp: it the car a top speed of 300 km/h and accelerated it standstill to 100 km/h in 4.8 seconds. to the C 111-I, this version had a that had been improved in terms of vision for the driver as as aerodynamic efficiency – the Cd was 0.325, not bad at the The most important aspects, were the clearly improved of the Wankel engine and its torque to 40 mkg; this meant no contemporary road-going car would been a match for the C 111-II.

The company introduced that car to the public at the Geneva Motor in March 1970. Like the version, it immediately became an of desire for all those fans of the who were longing for a spectacular to the 300 SL Gullwing coupe. But hopes destroyed by ever more emission legislation in a large of countries and finally by the 1973 oil because the pollutant emissions of engines were difficult to and they also had a relatively fuel consumption – far from the demands of the time.


Daimler Communications, 70546

Racing diesel in keeping the times

Once the first of the oil crisis had been overcome, the engine was replaced by a diesel – a policy pursued by the entire since the diesel was known to be On the other hand, it was also known to be a lame duck – a that was not completely unjustified. had to be done about it, and the development and Board of Management came up the idea of establishing sales-promoting records. The basic engine suggested itself was the powerful, three-liter naturally aspirated from the 240 D 3.0 and 300 D, an engine with of potential for raising performance. a Garret turbocharger and an intercooler, the engine’s output of 80 hp was boosted to a 140 kW/ 190 hp to power the C 111-IID, revamped a diesel-engined record car, in the run on the brand-new test track in on June 12, 1976. The four who took turns at two-and-a-half intervals, drove this car one diesel record to the next a time-span of 60 hours, completed any problems. In the end, a total of 16 new had been established – those 5,000 miles, 10,000 and 10,000 miles even absolute world records, independent of the type of engine. averaged around 252 km/h. So the had proved its ability to race, and a suitable ratio, the C 111-IID the sprint from standstill to 100 in just 6.8 seconds.

The records established by the C 111-III

For involved in the project, this was the beginning, however. They they could have the car even faster, raising its top Communications, 70546 Stuttgart/Germany to over 300 km/h, but had to admit this was meant for an aerodynamically “proper” racing car rather for a road- going version of the C The Board of Management at the time has to be for sharing this view and the go-ahead for development. The design set about its task in early and created the C111-III on the basis of the C 111 specifications – a thoroughbred racing car aerodynamic features refined to the smallest detail and giving the car a Cd of 0.183, the lowest rating achieved up to that point in The car had a longer wheelbase than the C a narrower track, concealed a very low front end with powerful headlamps and a very and tapering rear end with a fin that was to enhance the car’s stability under side conditions.

The long and narrow driver’s featured a single seat: the passenger’s space was occupied by a fat conducting air into the intercooler. And was also room for the telemetry specially developed by Mercedes-Benz for data transmission during the runs, as well as for radio enabling the driver to communicate the team on the move. And finally, on 30, 1978, the time had come for the engined record car to drive lap lap at constant speed on the Nardo – anti-clockwise because this that the track- defining barriers were on the right-hand providing the drivers of the LHD cars a greater safety margin in the of an accident. At one stage during the radio communication saved a life: it was rescued in time crossing the racing car’s Communications, 70546 Stuttgart/Germany When the rear tire on the side burst during the driver’s stint at night-time, large holes into the the recovery truck arrived on the quickly to pick up the damaged car and its driver, while the mechanics the identical reserve car. this incident, clocks reset to zero and the hunt for began anew. The reserve car was a whisker faster than the car, and also a little economical, extending the refueling from 62 to 67 laps. The three were soon joined and by their extremely fast manager, Dr. Hans Liebold. All established by the time of the tire were repeated at even times, and the attempt was not even by another hedgehog which was enough to get in the record car’s way and its front spoiler. The repair no more than two minutes. The pit incidentally, lasted between 15 and 20 – the refueling, driver changes, checks and topping up of oil had all been planned and thoroughly practiced. 12 hours of otherwise problem-free the Mercedes-Benz brand had established absolute world records of engine type and displacement – with a near-production three-liter engine. At the end of the day, the engine in the car had consumed just less 16 liters per 100 kilometers (17.66mpg) – outstanding record given an speed of over 300 km/h.

Daimler Communications, 70546

The world records established by the C 111-III

100 km 316.484 km/h

100 319.835 km/h

500 km 321.860

Mercedes-Benz C111

500 miles 320.788 km/h

km 318.308 km/h

1000 319.091 km/h

1 hour km/h

6 hours 317.976

12 hours 314.463 km/h

circuit record: 403.978

A world circuit record of km/h had been in existence 1975, established by a 1,000 hp car from the American Can-Am Though not recognized by FIA, it was a desirable world record, and the successes with the C 111-III, the engineers felt that it was reach. Just another 100 hp do – but could no longer be squeezed out of the diesel. So the team opted for the 4.5 V8 gasoline engine from production, raised its displacement to 4.8 and equipped the unit with valves, two KKK turbochargers and a triple-plate that was capable of coping 600 Newtonmeters of torque.

With 368 kW/500 hp under the achieved at relatively low expense, a C modified into a racing car further aerodynamic improvements, two and additional spoilers set out in Nardo on May 5, to have a go at the world circuit After a smooth run, a new of 403.978 km/h had been Over and above this, the car upon the record marks ten and 100 kilometers as well as over ten and 100

Daimler Communications, 70546

Further information from is available on the internet at:

Daimler 70546 Stuttgart/Germany

Mercedes-Benz C111
Mercedes-Benz C111
Mercedes-Benz C111

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