Mercedes-Benz 300SL

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Mercedes-Benz 300SL
Mercedes 300SL Coupe vr silver EMS.jpg
Overview
Manufacturer Mercedes-Benz
Production 1952–1953 (racing car)
1954–1963 (production car)
3,258 built[1]
Coupé: 1,400
Roadster: 1,858
Assembly Stuttgart-Untertürkheim, Germany
Body and chassis
Class Sports car, GT
Body style 2 door coupé, roadster
Layout FR layout
Platform Mercedes-Benz W198
Related Mercedes-Benz W121 BII (190SL)
Powertrain
Engine 2996 cc M198 SOHC I6
212-222 hp
Transmission 4-speed manual
Dimensions
Wheelbase 2,400 mm (94.5 in)
Length 4,520 mm (178.0 in)
Width 1,790 mm (70.5 in)
Height 1,300 mm (51.2 in)
Curb weight 1,093 kg (2,410 lb)
Chronology
Predecessor Mercedes-Benz W194
(racing car)
Successor by name:
Mercedes-Benz W113 (230SL)
spiritual:
Mercedes-Benz SLS AMG

The Mercedes-Benz 300SL was the first iteration of the SL-Class grand tourer convertibles and fastest production car of its day. Internally numbered W198, it was introduced in 1954 as a two-seat sports car with distinctive gull-wing doors and later offered as an open roadster.

Built by Daimler-Benz AG, the fuel-injected production model was based on the company's highly successful yet somewhat less powerful carbureted 1952 race car, the Mercedes-Benz 300SL (W194).

The idea of a toned-down W194 tailored to affluent performance enthusiasts in the booming post-war American market was suggested by Max Hoffman. As such, it was introduced at the 1954 New York Auto Show rather than the Frankfurt or Geneva shows at which other Mercedes models made their debuts. The "300" in its name referred to its three litre engine displacement, and "SL" stood for "Sport Leicht" (Sport Light).

The 300SL was best known for its distinctive gull wing doors, first-ever consumer fuel-injection, and world's fastest top speed. The gull wing version was available from March 1955 to 1957, the roadster from 1957 to 1963. A "light" version of the 300SL was introduced in 1955 as the 190SL. While very different technically from the 300SL it is often referred as the 300SL's little sister as the two models share many elements. Both the 300SL and the 190SL were followed in the Mercedes line by the 230SL.

A race car for the street[edit]

New York Mercedes distributor Max Hoffman, Daimler-Benz's official importer in the USA, suggested to Daimler-Benz AG management in Stuttgart that a street version of the 300SL would be a commercial success, especially in America.

The racing W194 300SL was built around a tubular chassis to offset its relatively underpowered carbureted engine. Designed by Daimler-Benz's chief developing engineer, Rudolf Uhlenhaut, the metal skeleton saved weight while still providing a high level of strength. Its unique architecture gave birth to the model's distinctive gull-wing doors, as part of the chassis passed through what would be the lower half of a standard door. Even with the upward opening doors, the 300SL had an unusually high sill, making entry and exit from the car's cockpit problematic. A steering wheel with a tilt-away column was added to improve driver access.

The 300SL's body was mainly steel, except for the aluminum hood, doors and trunk lid. It could also be ordered with an all-aluminium outer skin at tremendous added cost, saving 80 kg (176 lb).

More than 80% of the vehicle's total production of approximately 1400 units were sold in the US, making the Gullwing the first Mercedes-Benz which sold in considerable numbers outside its home market and confirming the validity of Hoffman's suggestion. The 300SL is credited for changing the company's image in America from a manufacturer of solid, but staid, automobiles to that of a producer of sporty cars.

First direct injection[edit]

1955 Mercedes-Benz 300SL Gullwing Coupé from the Ralph Lauren collection
1957 Mercedes-Benz 300SL Roadster
1956 300 SL
1956 "Gull wing" open

The 300SL's engine, canted at a forty-five-degree angle to the left to allow for a lower hoodline, was the same 3.0 litre straight-6 as the regular four-door 300 tourer. Fitted with a Bosch mechanical Gasoline direct injection system it had almost double the power of the original 86 kW (115 hp) carbureted version.

While not the first fuel-injected car - Mercedes engineers who had developed the principle for the DB 601 fighter aircraft engine had used fuel injection in the tiny 2-stroke Gutbrod they had designed after the War - it was the first to inject fuel directly into the cylinders. This innovation allowed a top speed of up to 260 km/h (161 mph) depending on gear ratio and drag, making the 300SL the fastest production car of its time.

The engine's maintenance requirements were high. Unlike the current electrically powered fuel injection systems, the mechanical fuel pump would continue to inject gasoline into the engine during the interval between shutting off the ignition and the engine's coming to a stop; this gasoline was of course not burned, and washed the oil from the cylinder walls and ended up diluting the engine's lubricating oil, particularly if the engine was not driven hard enough nor long enough to reach a temperature high enough to evaporate it out of the oil.

Exacerbating the problem were the large oil cooler as well as the large volume of oil (10 liters), both oriented more to racing than to street driving, which virtually guaranteed that the oil would not reach a high enough temperature. In practice, many street drivers would block off airflow through the oil cooler, and the recommended oil change interval was 1,000 miles (1,600 km). Operation of the clutch was initially very heavy, later roadsters having an improved clutch arm helper spring which reduced the pedal force. From March 1963 to the end of production, a light alloy crankcase was used on a total of 209 vehicles.[2]

Aerodynamics played an important role in the car's speed, Mercedes-Benz engineers even placing horizontal "eyebrows" over the wheel openings to reduce drag. Unlike many cars of the 1950s, the steering was relatively precise and the four-wheel independent suspension allowed for a reasonably comfortable ride and markedly better overall handling. However, the rear swing axle, jointed only at the differential, not at the wheels themselves, could be treacherous at high speeds or on imperfect roads due to extreme changes in camber. The enormous fuel tank capacity caused a considerable difference in handling depending on the quantity of fuel on board.

Racing history[edit]

In 1952, the original 300SL (model Mercedes-Benz W194)[3] scored overall wins at the 24 Hours of Le Mans, in Bern-Bremgarten, in the sportscar race of the Eifelrennen at the Nürburgring, and in Mexico's Carrera Panamericana. It also managed second and fourth places at its first outing, the Mille Miglia in 1952 and it won the Rally Stella Alpina in 1955 in its last edition.[4]

These successes, especially those on the high speed open road races, were rather surprising as the engine then was fitted only with carburetors, producing 175 hp (130 kW), which was not only less than the competing cars by Ferrari and Jaguar, but also less than the road car of 1954. Low weight and low aerodynamic drag made the 300SL fast enough to be competitive in endurance races.

The 300SL today[edit]

The 300SL beside the Mercedes-Benz SLS AMG, its spiritual successor.

Today, the 300SL with its unique doors, technological firsts, and low production numbers is considered one of the most collectible Mercedes-Benz models, with prices generally in the US$700,000-1,000,000 range.[5] Sports Car International magazine ranked the 300SL as the number 5 sports car of all time. A pair of 300SLs for sale in 2009 were offered at over $1.3M USD from the Foxwood Collection. In 2012, an ultra rare 1955 Mercedes-Benz 300 SL with an all-aluminum body (only 29 made) was sold for US$4.62 million at the Scottsdale Auctions in Arizona.[5] Given the stratospheric prices that a 300SL commands, many car enthusiast have turned towards the smaller 190SL, often referred as the "poor man's 300SL" as its acquisition costs are a tenth that of the 300SL's.

Subsequent generations of the Mercedes-Benz SL-Class have been continually produced. The R230 (2002-2011) and the R231 (2012-present) have air inlets in the front fenders which are inspired by the 300SL Gullwing.[6] However, the SL has since evolved to become a more autobahn-focused grand tourer due to increasing weight, especially with its optional V12 engine in later iterations.[7] The last two generations of the SL are hardtop convertibles with technological and comfort amenities, and it also has available heated and cooled seats with a massage function.[8]

The Mercedes-Benz SLS AMG is described by Mercedes as a spiritual successor to the 300SL Gullwing.[9] Although there is some overlapping in price and performance with the R230 and R231 SL-Class, the lighter SLS AMG is considered more of a sporty track-oriented car, in the spirit of the 300SL.[7][8]

Mercedes-Benz also operates the Mercedes-Benz Classic Center that focuses on classic Mercedes-Benz restorations and is recognized as the central authority on 300 SL parts, service, restoration and vehicle trading as they have unique access to original build sheets and factory documentation which enables them to confirm a car's authenticity - a critical factor determining a collector car's true value.[10]

As part of a partnership between Mercedes-Benz and Nintendo, the Wii U game Mario Kart 8 features a 300SL Roadster as a playable in-game vehicle, added as part of a post-launch downloadable game update on August 27, 2014.[11]

Technical data[edit]

See also[edit]

References[edit]

  1. ^ a b Oswald, Werner (2001). Deutsche Autos 1945-1990, Band 4. Stuttgart: Motorbuch Verlag. ISBN 3-613-02131-5. 
  2. ^ Rohde, Michael; Koch, Detlev (2000). Typenkompass Mercedes-Benz. Stuttgart: Motorbuch Verlag. p. 41. ISBN 3-613-02019-X. 
  3. ^ the original 300SL (model Mercedes-Benz W194)
  4. ^ "Albo d'oro Stella Alpina". scuderiatrentinastorica.it. 
  5. ^ a b "Rare 1955 Mercedes-Benz 300SL Alloy sells for record $4.62 million". Autoblog. Retrieved 8 May 2012. 
  6. ^ [1]
  7. ^ a b Schultz, Jonathan (2012-03-20). "2013 SL65 AMG Muscles In on SLS AMG Roadster - NYTimes.com". Wheels.blogs.nytimes.com. Retrieved 2012-05-11. 
  8. ^ a b Michael Bettencourt (2012-04-03). "2013 Mercedes-Benz SL 550: A luxury retreat". The Globe and Mail. Retrieved 2012-05-11. 
  9. ^ "Mercedes 300SL Gullwing". Retrieved 16 December 2007. 
  10. ^ "Jay Leno Restores a Vintage Mercedes-Benz 300SL Gullwing". Popular Mechanics. Retrieved 8 May 2012. 
  11. ^ Pitcher, Jenna (August 6, 2014). "Mario Kart 8 Mercedes Car DLC Hits This Month With Update". IGN. Retrieved August 6, 2014. 
  12. ^ US prices: Mike Covello: Standard Catalog of Imported Cars 1946-2002, Krause Publication, Iola 2002, ISBN 0-87341-605-8, p. 527-31

External links[edit]