45 Years Ago Mercedes-Benz Launched The 450 SEL 6.9
The Mercedes-Benz 450 SEL 6.9 made its debut 45 years ago continuing a theme of high performance luxury saloon cars.
Mercedes took it’s long wheel base S Class, 450 SEL and fitted the biggest engine they had under the bonnet. The 6.9 litre 8 cylinder engine had 286bhp (210 kW) and 405 lb/ft (549 N/M) of torque. This gave the car a maximum speed of 140mph or 225 km/h.
Timing for this introduction wasn’t great due to the world going through the oil crisis. A shortage of oil coming out of the oil producing nations promoted fear of a lack of fuel. That and rising prices.
The Mercedes W116 series was designed to be the worlds best vehicle. Offering levels of refinement and comfort above the competition. Adding a performance element wasn’t something many had expected. Making luxury saloons into drivers cars didn’t seem as obvious at the time. Now you can see that this is a market segment of it’s own. The 450 SEL 6.9 was one of the fastest vehicles available at the time, there were a few sports cars were able to reach higher speeds. It was a favourite of Formula 1 drivers at the time too.
And being the first like this to be designed with a performance version from the outset makes it a highly desirable classic. W116 Models of all variants are extermely cpable and refined and not in huge supply. The 6.9 was built in even fewer numbers, only 7380 were made over the model’s 6 year run. Some 1816 of these were officially sold in the United States.
The Mercedes W116 S Class
Introduced in September 1972, the Mercedes 116 series S-Class received many awards from the start. The 450 SE being 1974’s Car of the Year. Three years later saw the introduction of the 450 SEL 6.9. Mercedes had already set the bar with the 300 EL 6.3 as a performance large, luxury saloon. The engine in the 6.9 was based on the 100 series eight cylinder. The 600 series had been using this large engine in the 6.3 litre configuration for some time. The 6.9 was based on this, but with a 107mm bore up from 103mm. This increase gave the displacement of 6,834cc.
The high level of torque available enabled Mercedes to fit a very “long” rear-axle ratio of 2.65 to the car’s three speed automatic transmission. This was to cut the engine speed when cruising to reduce the level of nopise in the car. Sodium filled valves were controlled by hydraulic tappets, making service adjustments unnecessary. Dry sump lubrication with a capoacity of twelve litres made it possible to stretch oil change intervals to a little over 9000 miles or 15,000 kilometres.
Comfort And Performance
Something Mercedes-Benz are renowned for is making their performance cars ride well. Especially in S Class guise. The 6.9 W116 followed on from the 300 SEL, which had pneumatic suspension, with a hydropneumatic variant. This included a level control system where the ride height could be increased. Unless you were in the US where this was deemed to be illegal and the control lever was not fitted.
There were four spring elements to take over shock absorber activities. A pressurised oil system balances out the oil volume within the spring struts. This results in a constant ride height and still gives full spring travel. always remains available.
A press release from 1975 described the outstanding handling as “this innovation ideally links excellent handling characteristics and maximum comfort throughout the entire speed range”.
For your money you got the performance, handling and ride. Additional comfort features such as an air conditioning, heat-insulating glass, heated rear window, central locking, cruise control, electric windows and a headlight cleaning system. Velour trimmed upholstery was seen to be the height of luxury, leather was a hard wearing material not to be used for plushness. Of course optional extras were available. A sunroof and a Becker car phone. The equipment levely weren’t quite the same as a Rolls-Royce or Cadillac, but then neither was the performance.
Also safety features too were high on the appeal of the S Class with many innovations being fitted. Such as the first electronic four-wheel multi-channel anti lock braking system (ABS). This system from Bosch was an option from 1978 onwards.
Motor magazine remarked the following: “There is only one word to sum it all up: fabulous!” And “auto motor und sport” headed up edition 21/1975 with a simple “The world’s best car” and captioned: “The 450 SEL 6.9 sets new benchmarks in the automotive top class.”
Thanks to Mercedes-Benz for the images.
Simon
If you like Mercedes then you’ll like the C111, link to that anniversary here.
And of course the Mercedes museum in Stuttgart is a must: https://www.mercedes-benz.com/en/classic/museum/