 Built around an all-new tubular space frame, the Disco Volante used lightened components from the Alfa Romeo 1900.As on the 1900, the engine was a inline-four with double chain-driven overhead camshafts, but used an aluminium block and inserted sleeves instead of the 1900s cast iron one.While the 1900s 88 mm stroke was retained, cylinder bore had grown from 82.55 mm to 85 mm, bringing total displacement to 1,997.4 cubic centimetres; compression ratio was raised to 8.73