2 motors x 3 seats = U8 engine
Coupling two 4-cylinder engines an 8-cylinder "U" engine was obtained:
The 2 original crankshafts were connected by two chains to a third auxiliary shaft.
Because of the oil "chock" super cars became suddenly obsolete and energy saving became a commercial must ("U8" featured 28 litres/100 kilometres)! The project didn't go into production.