Mercedes-Benz 450SEL 6.9

Mercedes-Benz 450SEL 6.9
Mercedes-Benz 450SEL 6.9
Overview
Manufacturer	Daimler-Benz
Also called	Mercedes-Benz 6.9 (North America)
Production	1975–1980
Model years	1977–1981 (North America)
Body and chassis
Class	Full-size luxury car (F)
Platform	Mercedes-Benz W116
Powertrain
Engine	6834 cc M100 V8
Transmission	3-speed automatic
Dimensions
Wheelbase	2,960 mm (116.5 in)
Length	5,060 mm (199.2 in); 5,335 mm (210.0 in) (US and Canada)
Width	1,870 mm (73.6 in)
Height	1,430 mm (56.3 in)
Curb weight	1,985 kg (4,376 lb)
Chronology
Predecessor	Mercedes-Benz 300SEL 6.3

Last updated April 07, 2024

The Mercedes-Benz 450SEL 6.9 (marketed in North America as simply the Mercedes-Benz 6.9) is the high-performance version of the W116 S-Class saloon. It was based on the long-wheelbase version of W116 chassis introduced in 1972 and equipped with Mercedes-Benz M100 V8 engine and full hydropneumatic suspension system. The 450SEL 6.9 was presented to the public at the Geneva Auto Show in 1974 as the successor to the original high-performance saloon from Mercedes-Benz, the 300SEL 6.3 (1968–1972). Like the 300SEL 6.3 before it, the special displacement number (6.9) was affixed to the trunk lid to differentiate itself from the 450SEL. The 450SEL 6.9 was produced in very limited numbers from 1975 to 1981.

M100 engine

The 6.3-litre M100 V8 engine, originally fitted to 600 and 300 SEL 6.3, was enlarged to 6.8 litres (6,834 cubic centimetres or 417 cubic inches) by boring it out to 107 mm (4.21 in). The stricter emission regulations in the mid-1970s necessitated the larger displacement as to compensate for the lowered output. The fuel injection system was upgraded to the third-generation mechanically controlled, continuous-injection system Bosch K-Jetronic.^[4]

Due to its sheer size, the engineers fitted the dry sump oil lubrication system as to lower the engine height and preserve the low hood line.^[5] The dry sump system had larger capacity at 12 litres rather than 5 litres for the wet sump system fitted to the smaller M116 and M117 V8 engines. The dipstick was moved from the engine block to the oil tank’s filler cap. The larger oil capacity extended the oil change interval to 20,000 km (12,500 miles).

For the European and international markets, the M100 engine produced 213 kW (290 PS; 286 bhp) at 4,250 rpm and 546 N⋅m (403 lb⋅ft) at 3,000 rpm. The 450 SEL 6.9 for the North American markets had the reduced output and compression ratio (8.0:1 instead of 8.8:1) and was fitted with catalysator that required lead-free petrol: 186 kW (253 PS; 249 bhp) at 4,000 rpm and 488 N⋅m (360 lb⋅ft) at 2,500 rpm. The 450 SEL 6.9 sold in Australia had slightly reduced output due to Australia's new 1977 emission regulations: 198 kW (269 PS; 266 bhp) at 4,200 rpm and 510 N⋅m (376 lb⋅ft) at 2,800 rpm.^[6]

During its entire production run, the engine displacement of 6.8 litres was the largest V8 engine ever built by Mercedes-Benz and by any European manufacturer since the Second World War.

Suspension

The full hydropneumatic self-levelling suspension system from Mercedes-Benz was first introduced in 450SEL 6.9 as a standard equipment. The other W116 models used the hydropneumatic system for the rear suspension only as level control under heavy load (Option No. 48/0, "Niveauregulierung").^[7] The full system was exclusive to 450SEL 6.9 until 1981 when the next generation, HPF II, was offered as an extra-cost option for W126 380SEL and 500SEL. The 600 and W109 used the air suspension for self-levelling.

The Mercedes-Benz system differentiated from Citroën system, introduced in 1954, in some ways. Mercedes-Benz used the timing chain to drive the hydraulic pump instead of rubber belt in Citroën system. Citroën system used a single pump to send the vegetable oil (and later mineral oil) to the brake boost, power steering, power clutch (when equipped with semi-automatic transmission), and hydropneumatic suspension system. Mercedes-Benz system had the separate pumps for brake boost, power steering, and hydropneumatic suspension, citing the better failsafe measures than Citroën in the event of a hydraulic failure. The Mercedes-Benz system contained the hard rubber dampers that served as temporary springs and allowed the car to be driven if the hydraulic pump or components failed. Both manufacturers had different approaches when the cars were parked and switched off. Citroën lowered themselves closer to the ground while Mercedes-Benz did not. Mercedes-Benz suspension system has the feature that maintains body level without squatting at the rear or diving in the front during the acceleration and braking respectively.

North American market

Initially, Mercedes-Benz did not plan on selling the 450SEL 6.9 in the United States given the oil crisis that hit the Americans very hard and increasingly tightening emission regulations. Mercedes-Benz had difficulties in meeting the European demand. However, the strong requests from the customers and dealers reversed the decision.^[3]

In the North American market, the 450SEL 6.9 was called simply the 6.9 and featured the model name on the right side of the trunk lid. The retail price was more than $38,230 ($193,291.51 adjusted for 2024) for the 1977 model year and increased to $52,995 ($196,213.19 adjusted for 2024) at the end of production in 1980.^[3]

The 6.9 was fitted with four sealed beam 5.75" round capsule headlights with bezels and larger impact absorbing bumpers that lengthened the car by 11 inches. Due to the US FMVSS bumper standard, the variable height suspension was disabled, and the height adjustment knob was removed.^[8] To differentiate the 6.9 from other W116 models, the bumpers had a thick black rubber strip covering their entire width, and did not feature rubber bumper guards.

The engine output was reduced to 186 kW (253 PS; 249 hp) and 488 N⋅m (360 lb⋅ft) due to the stricter emission standards.^[9]

Price

The retail price of 450SEL 6.9 was DM 69,930^[7] at its launch in 1975 and was DM 81,247^[10] at the end of its production in 1980. The 450SEL 6.9 had a premium of DM 25,000 to 30,000 over the 450SEL.

While the 450SEL 6.9 was visually indistinguishable from the other W116 models, it had wider wheels and tires along with 6.9 on the right side of trunk lid. The 6.9 had more standard features that were extra cost options in other W116 models: automatic HVAC system, power windows, power rear seats, headrests for the rear passengers, central locking system, headlamp washer and wiper system, heat-insulating glass, and a few other equipments.^[11]

Interior features

Despite the higher retail price, the interior of the 450SEL 6.9 was indistinguishable from the other W116 models except for the different type of wood trims, height adjustment knob, and two extra warning lamps in the instrument cluster for the low suspension pressure warning and height adjustment indicator. Heated seats for driver and front and rear passengers as well as electric sunroof were extra cost options. No power-assisted external rear view mirrors and seat adjustments, commonly fitted to luxury cars such as Cadillac and Rolls-Royce during the 1970s, were ever offered in the 450SEL 6.9.

The first-ever automatic HVAC system from Mercedes-Benz was introduced in the 450SEL 6.9 as a standard equipment and as optional extra-cost equipment in other W116 models. The automatic HVAC system was adapted from Chrysler Corporation and had a compressor from Harrison division of General Motors.

The 450SEL 6.9 had exclusive wood trim finished in burled walnut veneer on the dash and console instead of striated zebrano veneer as found in other W116 models.

Cultural references

After the persistent rumours, the French director Claude Lelouche revealed the car he used to drive through Paris at a very high speed to the rendezvous point at Montmartre in his eight-minute film, C'était un rendez-vous . He used a 1976 450SEL 6.9 with the camera mounted under the front bumper. He used the sound track from the Ferrari 275 GTB, giving the impression that he drove a Ferrari.
The 450SEL 6.9 was driven by Vincent, one of the protagonists in Ronin , and was involved in several of the film's car chase scenes.
In David Lynch's 1996 film, Lost Highway, a 450SEL 6.9 was used as a major plot device, connecting all three main male characters in the film. In one scene, the hood was lifted up to reveal the 1,400-horsepower engine modification. In another scene, the car was used to push a Ford Thunderbird off the road despite the latter applying the brakes.^[12]

Technical data

Specifications^[13]
Engine	V8, two single overhead camshafts (SOHC), five main bearings
Displacement	6,834 cubic centimetres (417.1 cubic inches)
Bore/stroke	107 × 95 mm (4.21 × 3.74 inches)
Fuel Delivery	Bosch K-Jetronic fuel injection
Compression ratio	8.8:1 (European) 8.0:1 (US)
Net power	213 kW (290 PS; 286 bhp) at 4,250 rpm (International) 186 kW (253 PS; 249 bhp) at 4,000 rpm (US) 198 kW (269 PS; 266 bhp) at 4,200 rpm (Australia)
Net torque	546 N⋅m (403 lb⋅ft) at 3,000 rpm (International) 488 N⋅m (360 lb⋅ft) at 2,500 rpm (US) 510 N⋅m (376 lb⋅ft) at 2,800 rpm (Australia)
Maximum engine speed	5300 rpm
Transmission	Three-speed automatic with torque converter
Rear axle ratio	2.65:1
Dimensions
Curb weight	1,985 kg (4,390lb)
Wheelbase	2,960 mm (116.5 inches)
Front track	1,521 mm (59.9 inches)
Rear track	1,505 mm (59.3 inches)
Overall length	5,060 mm (199.2 inches) (International) 5,335 mm (210 inches) (US)
Width:	1,870 mm (73.6 inches)
Height:	1,410 mm (55.5 inches)
Trunk (boot) capacity	0.52 cubic metre (18.2 cubic feet)
Steering, Brakes, and Wheels
Steering type	recirculating ball, power
Turns, lock-to-lock	2.7
Turning circle	12.1 m (40 ft)
Tires	Michelin XWX 215/70VR14 steel-belted radial
Wheels	6.5Jx14 light alloy
Braking system	Dual-circuit, power-assisted hydraulic, ventilated front disc, non-ventilated rear disc
Total swept brake area	2,945 square cm (456.5 square inches)
Braking 110–0 km/h (70–0 mph): 63 m (207 feet)
Fuel
Fuel tank capacity	96 litres (25.1 gallons)
Fuel Consumption	16 L/100km (14.7 mpg US) combined 10 mpg city/14 mpg highway (US EPA cycle)
Accommodations
Head Room	980 mm (38.6 inches) Front 942 mm (37.1 inches) Rear
Leg Room	1,060 mm (41.7 inches) Front 967 mm (38.1 inches) Rear
Hip Room	1,460 mm (57.5 inches) Front 1,510 mm (59.5 inches) Rear
Shoulder Room	1,400 mm (55.1 inches) Front 1,394 mm (54.9 inches) Rear
Performance
Acceleration	0-100 km/h: 7.4 seconds 0-60 mph: 7.2 seconds
Top speed	237 km/h (147 mph)

Production
Year	International	North America
1975	474	0
1976	1475	0
1977	1798	462
1978	1665	437
1979	1839	576
1980	129	317
1981	4	0
Total	7380	1816

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References

↑ "Safe Braking: Start of developing Bosch's anti-lock braking system ABS, The first production-ready ABS". Bosch GmbH. Retrieved 20 July 2021.
↑ Venugopal, Abhinand (27 August 2018). "ABS (Anti-Lock Braking System) — A Brief History Of A 40-Year-Old Life-Saver". Drive Spark.
1 2 3 Davis, Jr., David (1 July 1977). "Mercedes-Benz 450SEL 6.9: Fastest European Sedan". Car and Driver.
↑ "1979 450SEL 6.9 The muscle car from Stuttgart". The Star. March 1990. Retrieved 20 July 2021.
↑ Ahrens, Ronald (30 September 2014). "Mercedes-Benz 450 SEL 6.9 Was All About Engineering". Petrolicious.
↑ "Classic Distinction: Buyers Guide". Unique Cars. September 1999. Retrieved 20 July 2021.
1 2 "W116, W107, W100 Preisliste Nr. 15a gültig ab 01.09.1975". Mein Benz. Retrieved 19 July 2021.
↑ "1978 Mercedes-Benz 6.9 Sedan". Significant Cars. Retrieved 19 July 2021.
↑ Lieberman, Jonny (19 September 2007). "Mercedes-Benz 450SEL 6.9". Jalopnik. Retrieved 10 April 2017.
↑ "W116, W126, Preisliste Nr. 28 gültig ab 13.09.1979". Mein Benz. Retrieved 19 July 2021.
↑ "Mercedes-Benz S-Class W116 280S : 280SE : 280SEL : 300SD : 350SE : 350SEL : 450SE : 450SEL : 450SEL 6.9". W116.org. Retrieved 20 July 2021.
↑ "Cinematic cars: Mercedes-Benz 450SEL 6.9 from "Lost Highway" (1997)". Motoring Con Brio. 8 February 2010. Retrieved 20 July 2021.
↑ Oswald, Werner (2003). Deutsche Autos 1945-1990, Band 4. Stuttgart: Motorbuch Verlag. pp. 80, 86. ISBN 3-613-02131-5.

External links

International M-100 Group — Factory-authorized site with information on all M-100-powered Mercedes-Benz automobiles, (including technical forums and maintenance information). The Brock Yates article can be found here as well
A Mercedes for the '70s: The W116 Series S-Class — A site mixing the history of the full-scale W116 with that of its many miniature replicas.
Classic Car driver review
Golden Brown: Four Days in a Mercedes-Benz 450SEL 6.9 - Feature (Car and Driver)
Curbside Classic: 1977 Mercedes 450 SEL 6.9 – Deutsches Heavy Metal – a retrospective of the 450SEL 6.9
Petrolicious: Mercedes-Benz 450SEL 6.9 Was All About Engineering – another retrospective of the 450SEL 6.9
Youtube clip of Ronin high-speed chase featuring a 6.9

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[1] "Safe Braking: Start of developing Bosch's anti-lock braking system ABS, The first production-ready ABS". Bosch GmbH. Retrieved 20 July 2021.

[2] Venugopal, Abhinand (27 August 2018). "ABS (Anti-Lock Braking System) — A Brief History Of A 40-Year-Old Life-Saver". Drive Spark.

[car-driver-3] 1 2 3 Davis, Jr., David (1 July 1977). "Mercedes-Benz 450SEL 6.9: Fastest European Sedan". Car and Driver.

[4] "1979 450SEL 6.9 The muscle car from Stuttgart". The Star. March 1990. Retrieved 20 July 2021.

[5] Ahrens, Ronald (30 September 2014). "Mercedes-Benz 450 SEL 6.9 Was All About Engineering". Petrolicious.

[6] "Classic Distinction: Buyers Guide". Unique Cars. September 1999. Retrieved 20 July 2021.

[meinbenz-7] 1 2 "W116, W107, W100 Preisliste Nr. 15a gültig ab 01.09.1975". Mein Benz. Retrieved 19 July 2021.

[8] "1978 Mercedes-Benz 6.9 Sedan". Significant Cars. Retrieved 19 July 2021.

[9] Lieberman, Jonny (19 September 2007). "Mercedes-Benz 450SEL 6.9". Jalopnik. Retrieved 10 April 2017.

[10] "W116, W126, Preisliste Nr. 28 gültig ab 13.09.1979". Mein Benz. Retrieved 19 July 2021.

[11] "Mercedes-Benz S-Class W116 280S : 280SE : 280SEL : 300SD : 350SE : 350SEL : 450SE : 450SEL : 450SEL 6.9". W116.org. Retrieved 20 July 2021.

[12] "Cinematic cars: Mercedes-Benz 450SEL 6.9 from "Lost Highway" (1997)". Motoring Con Brio. 8 February 2010. Retrieved 20 July 2021.

[Oswald-13] Oswald, Werner (2003). Deutsche Autos 1945-1990, Band 4. Stuttgart: Motorbuch Verlag. pp. 80, 86. ISBN 3-613-02131-5.

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