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The Porsche 645 Spyder is a sports car made by Porsche. It was the successor to the Porsche 550.
The 645 ("Mickey Mouse") was designed based from the Porsche 550A, with a wheelbase of 2,000 mm and a 100 mm front and 140 mm rear track width reduced to 1,150 mm. This modification allowed for a lower end surface and a higher top speed. The rear part has been increased for the central cooling fan, as it were two rearward facing openings for the carburetor and a slot for the cooling air. The so-called Fuhrmann, an air-cooled 4-cylinder boxer engine with four camshafts (two on each side), with vertical shafts and double ignition with two separate ignition distributors and two ignition coils and two Weber 40 DCM twin downdraft carburetors, powered the car. The engine had a volume of 1,498 cm³, and could deliver power up to 99 kW (135 hp) at 7200 rpm, with maximum torque of 145 Nm at 5.900/min.
During this race on the AVUS On 16 September 1956 in the AVUS race, a 645 driven by Richard von Frankenberg crashed. The car crashed through the banked curve into the North about 15 m below the paddock and burned; von Frankenberg, who had been thrown out, remained almost intact. The accident was believed to be caused by defects in materials. The Mickey Mouse project was scrapped thereafter, and in mid-1957 the Porsche 718 RSK Spyder 1500 was released instead.