Mercedes-Benz 450SEL 6.9 Overview Manufacturer Production 1975–1981 Body and chassis () Powertrain 6.834 L 3-speed Dimensions 2,960 mm (116.5 in) Length 5,060–5,335 mm (199.2–210.0 in) Width 1,870 mm (73.6 in) Height 1,430 mm (56.3 in) 1,985 kg (4,376 lb) Chronology Predecessor Successor (direct) (ideological) (spiritual) The Mercedes-Benz 450SEL 6.9 is the high-performance top-of-the-line version of the model luxury saloon. It was built by in, and based on the long-wheelbase version of the chassis introduced in 1972. The model was generally referred to in the company's literature as the '6.9', to separate it from the regular 450SEL. It featured the largest engine of any non-American production car post WWII.

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The 6.9 was first shown to the motoring press at the in 1974, and produced between 1975 and 1981 in extremely limited numbers. It was billed as the flagship of the Mercedes-Benz car line, and the successor to 's original high-performance sedan, the. The 6.9 also has the distinction of being among the first vehicles ever produced with optional electronically controlled, first introduced by Mercedes-Benz and in 1978. The 6.9's successor (since 1985) — the top of range — continued the 6.9's suspension as an extra-cost option.

Is the current iteration of this innovation. Logitech 8k89 ite camera driver windows 7. Euro-spec 450SEL 6.9 The suspension system gave the 4200 pound (1900 kg) car the benefits of both a and that allowed it, in the words of automotive journalist, to be 'tossed about like a.' The car also featured a model W3B 050 three-speed unique to the 6.9 and a standard ZF both for enhanced performance on dry pavement and enhanced in inclement weather. Four-wheel and four-wheel independent suspension were standard across the W116 model range. M-100 power plant [ ] The engine was a with single overhead camshafts operating -filled against hardened valve seats on each aluminium alloy cylinder head. Each hand-built unit was bench-tested for 265 minutes, 40 of which were under full load. Bosch electromechanical was standard at a time when fuel-injected cars were uncommon.

As in all Mercedes-Benz automobile engines, the crankshaft, connecting rods and pistons were instead of. The 6.9 (6834 cc or 417 in³) power plant was factory-rated at 286 hp (213 kW) with 405 lbft (549 Nm) of helping to compensate for the 2.65 to 1 final necessary for sustained high-speed cruising. A special version for Australia, based on the North American version, however without catalyst, was rated at 269 hp (198 kW) with 51 kpm (510 Nm) of. In the interest of both engine longevity as well as creating some extra space under the hood, a ' engine system was used.

The system circulated twelve quarts of oil between the storage tank and the engine, as opposed to the usual four or five quarts found in V8s with a standard oil pan and oil pump. As a result, the engine itself had no dipstick for checking the oil level. Rather, the dipstick was attached to the inside of the tank's filler cap (accessible from the engine compartment) and the oil level was checked with the engine running and at. The dry sump system also had the benefit of extending the oil change interval to 12,500 miles (20,000 km). This, along with hydraulic valve lifters which required no adjusting and special cylinder head gaskets which eliminated the need for periodic retorquing of the head bolts, made the 6.9 nearly maintenance-free for its first 50,000 miles (80,500 km). The 6.9 required little basic service other than coolant, minor tune-ups, oil changes, and replacement of the air, fuel, oil and power steering filters. Race track performance [ ] Top speed was factory-rated at 140 mph (225 km/h).

Among the journalists that tested and reviewed the car was. Yates was approached by the factory to write promotional literature about the 6.9.

He agreed, but under the condition that he could list the car's faults as well as its positives. Daimler-Benz agreed in turn, and Yates was given a US-spec 6.9 to drive from to the grand prix race track in. There, Yates would drive the car in as-arrived condition at racing speeds for a full 40 laps or just over 100 miles (160 km).

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The only change made to the car upon its arrival at Road Atlanta was the necessary adjustment of tire pressure. Driving 40 laps was a difficult task even for a purpose-built race car, let alone a street-legal sedan designed and geared for high-speed cruising. The 6.9 suffered no mechanical problems and averaged a very respectable 72 mph (116 km/h) throughout the test, completing it with little more than excess dust on the bodywork from the street tires on which the car was driven to Atlanta. Yates was so comfortable driving the 6.9 around the track that he reported having run at least one lap with the sunroof open and the radio on, but the high price of the car made him think better of such risky driving and he finished the test with the radio off and both hands on the wheel.