CMC M-120 Mercedes-Benz 300 SLR Engine with showcase Scale 1:18
The basic design of this engine, apart from displacement, is virtually akin to what we see in the engine of the Grand Prix car W196. By comparison, the displacement of the 300 SLR engine is 486 ccm larger than that of its counterpart, while its stroke/bore is increased to 78 x 78 mm. Moreover, the top speed is attained at 7,500 rpm in this engine, as against 8,500 rpm in the W196 engine.
The 300 SLR was so designed that even when the engine was running on low speed, a fast revving-up capacity was available. This feature mattered a lot in sports car races, where good acceleration provided a very positive advantage. In the building of the 300 SLR engine, a cylinder block made of aluminium alloy was adopted for the first time. Likewise, its cylinder liner was made of chromed aluminium instead of steel. Both represented cutting-edge engineering of their time.
The driveline arrangement of the engine was also innovative. Power transfer was virtually initiated through a pinion gear positioned between the two 4-cylinder blocks that were covered with an 8-cylinder crankcase. Inside the casing was an elaborate Hirth crankshaft propelled by the cylindrical rods that were fitted with roller bearings.
Despite its high compression ratio, the SLR engine was able to run on conventional fuel without any loss of performance, which gave the car an edge in long-distance races on public roads. A good example of strategic foresight that enabled the SLR to stop for refuelling anywhere along the way.
Technical Data (Original Vehicle)
-8-cylinder in-line-engine (installation angle 53° inclined to the right)
-Two coercive controlled valves for each combustion chamber (desmodromic), operated over two overhead gear-driven camshafts
-Power take-off from the mid of the engine with a supportive drive shaft to the single disc dry clutch
-Fuel management over a mechanic direct injection from Bosch
-Tenfold mounted Hirth crankshaft with connecting rods running on roller bearings
-Crankcase made of two consecutive lying 4-cylinder blocks, caste of a light metal alloy with a high magnesium share
-Separate cylinder heads of light metal; wet, chrome coated cylinder liners
-Dry sump lubrication and combined oil-circulation system with gear drive
• Maximum output: 310 hp at 7,500 rpm
• Displacement: 2,982 ccm
• Bore x stroke: 78 x 78 mm
• Compression Ratio: 12 : 1
• Top speed: approx. 300 km / hr
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