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Alfa Romeo Tipo 33 Stradale (1967)


The 33 Stradale is the first production vehicle to feature dihedral doors, also known as butterfly doors. The 33 Stradale also features windows which seamlessly curve upward into the ‘roof’ of the vehicle. The car has aluminium body on aluminium tubular chassis. As a result of being built by hand, each model differs from the others for some details. For example, early models had twin headlights, replaced in the last ones by single lights. The position of the windscreen wiper, and even the number of them, is another thing that differentiates each example from the others. Also the late models have vents added behind both the front and rear wheels to allow hot air from the brakes to escape.

The race-bred engine bore no relation to the mass-produced units in Alfa’s more mainstream vehicles. Race engineer Carlo Chiti designed an oversquare (78 mm (3.1 in) bore x 52.2 mm (2.1 in) stroke) dry-sump lubricated all aluminum 1,995 cc (121.7 cu in) V8 that featured SPICA fuel injection, four ignition coils and 16 spark plugs. The engine used four chain-driven camshafts to operate the valve train and had a rev-limit of 10,000 rpm. The engine produced 230 hp (172 kW) at 8,800 rpm in road trim and 270 bhp (201 kW) in race trim. The engine valves are operated via chain-driven double-overhead cams and has a 10.5:1 compression ratio. Because every Stradale is hand built and unique the power levels can vary by car, used rpms etc., for example the first production Stradale (No. 750.33.101) has factory datasheet that claims 243 hp (181 kW) at 9,400 rpm with a “street” exhaust and 254 hp (189 kW) with open exhaust.

Source: Wikipedia