In 1926, Daimler merged with Benz & Cie to create Mercedes-Benz. Technical Director Paul Daimler had left the company in 1922, and in April 1923, a Dr. Ferdinand Porsche arrived from Austria to finish the development of Daimler's new top-of-the-market model, the 24/100/140 PS (later renamed the Type 630). Under the technical direction of Porsche, Hans Nibel created the W 02 of 1926. From 1928 forward, Nibel worked solo as head of design and engineering.
After Nibel passed away in November of 1934, Mercedes' factory racing driver and team leader Max Sailer took over the design office. He continued the work of Nibel, developing the W 143 which debuted in February of 1937. Known as the Type 230, it was the successor to the Type 230 W21 and was the fourth-generation midsize car that began with the first W 02 of 1926. It came with four-wheel independent suspension, hydraulic drum brakes, and modern designs that were aesthetically pleasing. The box-frame chassis was enlarged from 106.3 to 120 inches, which greatly improved the ride quality. The bodywork was lengthened accordingly, from 173.2 to 180.3 inches. Most of the standard-bodied cars rested on the 180-inch length platform, while the six-light Pullman-Limousine-bodied cars were on a 189-inch platform. The list of body styles now included a six-seater 'Landaulet' and 'Tourenwagen (Touring Car),' along with a four-door four-seater cabriolet known as the 'Cabriolet D' and a 'Kraftdroschke' targeted at taxi operators. Mercedes offered three cabriolets including the afore-mentioned Cabriolet D, a 2/3 seat A, and a two-door, four-seat B. Special bodies were built to clients' needs, requests, and wishes, including a two-door Special Roadster with a short-wheelbase of 106.3-inches for buyers entranced by the racing exploits of Rudi Caracciola.
While the early cars used a four-speed transmission with synchromesh on the top two gears, the updated cars received fully synchronized transmissions. The Type 230 name of the model was sourced from its 2,229cc (2,213cc for tax purposes) inline six-cylinder side-valve engine with a bore and stroke of 72.5x90mm. It used a single Solex carburetor which delivered the fuel-air mixture into a combustion chamber with a compression ratio of 6.6:1, helping to develop 55 horsepower at 3,600 rpm and 100 lb-ft of torque at 1,800 RPM. The top speed was in the neighborhood of 72 mph and braking was handled by four-wheel hydraulically assisted drum brakes.
Production of the 143 continued until 1941, although only 22 examples were produced that year. Total production between 1936 and 1941 reached 20,336 examples, making it Mercedes-Benz's second most popular model to date.
The Mercedes-Benz W153 was introduced in early 1939 and often referred to as the Type 230. It was a direct successor to the W143 of 1937 but used a more modernized body and a redesigned chassis. While the W143 utilized a pressed steel sub-frame, the W153 employed an X-shaped oval tube design. Body styles included a saloon and three different cabriolets.
by Dan Vaughan