Name the engine with chassis of maserati 250f and entrant of luigi piotti with year less than 1957
Year Entrant Chassis Engine Points
Luigi Piotti
1235052
real text text text real
2-1235052-1
Complete Formula One World Championship results
Complete Formula One World Championship results
1955 Scuderia Volpini Arzani-Volpini Maserati Straight-4 0
1956 Officine Alfieri Maserati Maserati 250F Maserati Straight-6 0
1956 Luigi Piotti Maserati 250F Maserati Straight-6 0
1957 Luigi Piotti Maserati 250F Maserati Straight-6 0
1958 Automobili OSCA O.S.C.A O.S.C.A Straight-4 0
SELECT Engine FROM table WHERE Chassis = maserati 250f AND Entrant = luigi piotti AND Year < 1957
maserati 250f luigi piotti 1957