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The authors worked in the Engine Department at Nakajima Aircraft Co. from 1936 to 1945. Nakagawa was in the Engine Design Department, where he was involved in designing the air-cooled, radial double-row 14-cylinder 1,100 hp Sakae Model 20 engine and the radial 18-cylinder 1,800 - 2,000 hp Homare engine. Mizutani was a field engineer for these two engines and other engines. During that period we gained much experience in fuel and lubrication systems. Before the authors joined Nakajima, the company's engine development team had already developed a carburetor-based fueling system, which was subsequently used in all Nakajima engines. From 1941 on, all newly designed engines had to use 87-92 motor octane fuel by order of the Army and Navy. It was a very difficult task to change the engine specifications to meet this requirement, particularly for the Homare engine, which was initially designed for 100-octane fuel. The authors explain various steps taken to overcome this difficulty.