Sinlge Underhead Cam (SUHC)

Design derived from the well known single overhead cam (SOHC).

A breif history of the SOHC: Among the first overhead camshaft engines were the 1902 Maudslay SOHC engine built in the United Kingdom and the 1903 Marr Auto Car SOHC engine built in the United States. During World War I, both the Allied and German air forces sought to quickly apply the overhead camshaft technology of motor racing engines to military aircraft engines. The SOHC engine from the Mercedes 18/100 GP car (which won the 1914 French Grand Prix) became the starting point for both Mercedes' and Rolls Royce's aircraft engines. Mercedes created a series of six-cylinder engines which culminated in the Mercedes D.III. Rolls Royce reversed-engineered the Mercedes cylinder head design based on a racing car left in England at the beginning of the war, leading to the Rolls-Royce Eagle V12 engine. Other SOHC designs included the Spanish Hispano-Suiza 8 V8 engine (with a fully enclosed-drivetrain), the American Liberty L-12 V12 engine and the German BMW IIIa straight-six engine.