This is a quote from autosport.com forum
Just before the end of the F2 series in 1984, Ferrari and Morbidelli were working on a very secret project: a reed-valve, fuel injected 2-stroke V6 Formula 2 engine. At that time, the best F2 2-liter 4-stroke engines were cranking about 325HP. Morbidelli built a 2-liter V6 that could easily and lazily develop 400HP, only 200BHP per liter when the best 2-stroke engines could do 300BHP/liter for similar single-cylinder displacement. The thing was built but before it could even be started, the FIA killed the F2 and replaced it by F3000.
Think of the giant killer it could have been: the engine weighed only 1/2 of a conventional 4-stroke job, had a potential of at least 75 more caballos and fuel consumption was about 25% more, requiring carrying a bit more fuel but nowhere near as much as to negate the advantage.
The engine is also on display at the Morbidelli Museum.
To my knowledge not long after this the FIA banned the use of a lot of different engine formats for F1 including turbines, and 2 strokes etc. Also at some stage the Honda Oval Piston engine was also banned. Could you imagine the power you could get from a 3.5 litre V10 2 stroke and the sound.
Kevin