Mercedes-Benz 300 SLR “722”victory forever remembered
London, April 14, 2025, (Oilandgaspress) ––––On the occasion of the “70th anniversary of the 1955 motorsport season”, the focus this time is on the Mercedes-Benz 300 SLR racing sports car with number 722 in Legend Room 7: Silver Arrows – Races and Records.
No. 3/2025: Mercedes-Benz 300 SLR racing sports car “722”
An imposing number: The “722” stands out immediately. The large, red number shines on the front, sides and rear of the Mercedes-Benz 300 SLR racing sports car at the Mercedes-Benz Museum. This is one of the brand’s most famous racing cars – the Silver Arrow with which Stirling Moss and Denis Jenkinson won the Mille Miglia 70 years ago. What a successful racing début for the 300 SLR! The number stands for 7:22 am. That was the set time for the British team to leave the starting line on 1 May 1955. It was the beginning of an epic 1,000-mile road race from Brescia to Rome and back.
Made for the road: A Silver Arrow with indicators and lights, number plate and country identifier? The equipment of the 300 SLR in the racing curve in Legend Room 7 seems unusual for a motorsport vehicle. The dashboard even looks almost like something from a 1950s passenger car. But this is deceptive: the racing sports car was a thoroughbred competition vehicle based on the W 196 R Formula 1 racing car. Unlike the latter, the 300 SLR had road approval. It was built for long-distance races on public roads closed for this purpose, as well as for competitions on racing circuits.
Workplace: The Mercedes-Benz 300 SLR has a large array of controls. For example, a rotary switch to the left of the steering wheel activates the ignition and switches the parking, dipped and main beam headlamps in several stages. The starter button is located directly to its left. The indicator switch is located to the right of the steering wheel. The red control lamps for the indicators and ignition are to the right of the rev counter; the blue lamp for the main beam is to the left. By way of comparison, the W 196 R has just three round gauges and one switch.
Fresh air and sparks: In the 300 SLR, the driver also operates the fresh air flap with a lever at the bottom left of the dashboard, regulates cold starting with the choke on the far right behind the steering wheel, and keeps an eye on the warning indicator for the fuel reserve on the right below the rev counter. And finally, the Scintilla magneto ignition switch is positioned almost level with the front passenger. The choice between the settings 0, 1, 2 and 1+2 determines which magneto is switched on – or whether both work at the same time. The Swiss manufacturer Scintilla (Italian for “spark”) has been majority-owned by Bosch since 1954.
Full focus: The driver has a direct view of the large, centrally positioned Veglia rev counter through the steering wheel. The scale goes up to 11,000 rpm, with the red marker for the optimum engine speed at 7,000 rpm – that is where the three-litre M 196 S in-line eight-cylinder engine produces a continuous output of 203 kW (276 hp). To the left and right of the rev counter are smaller gauges for oil pressure and coolant temperature. The only thing the racing car lacks is a speedometer, because the motto is always this: drive as fast as the technology and route allow.
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