Table:
text: 1931 Monaco Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine
Ernst-Günther Burggaller German Bugatti Team Bugatti Bugatti T35B 2.3 L8
Hermann zu Leiningen German Bugatti Team Bugatti Bugatti T35C 2.0 L8
Heinrich-Joachim von Morgen German Bugatti Team Bugatti Bugatti T35B 2.3 L8
Rudolf Caracciola Private entry Mercedes-Benz Mercedes-Benz SSK L 7.1 L6
Earl Howe Private entry Bugatti Bugatti T51 2.3 L8
Clifton Penn-Hughes Private entry Bugatti Bugatti T35 2.0 L8
Henry Birkin Private entry Maserati Maserati 26M 2.5 L8
Bernhard Ackerl Private entry Bugatti Bugatti T37 1.5 L4
Juan Zanelli Private entry Bugatti Bugatti T35B 2.3 L8
Guy Bouriat Automobiles Ettore Bugatti Bugatti Bugatti T51 2.3 L8

text: 1931 Monaco Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine
Louis Chiron Automobiles Ettore Bugatti Bugatti Bugatti T51 2.3 L8
Albert Divo Automobiles Ettore Bugatti Bugatti Bugatti T51 2.3 L8
Achille Varzi Automobiles Ettore Bugatti Bugatti Bugatti T51 2.3 L8
Philippe Étancelin Private entry Bugatti Bugatti T35C 2.0 L8
Stanislas Czaykowski Private entry Bugatti Bugatti T35B 2.3 L8
Marcel Lehoux Private entry Bugatti Bugatti T35B 2.3 L8
William Grover-Williams Private entry Bugatti Bugatti T35C 2.0 L8
Boris Ivanowski Private entry Mercedes-Benz Mercedes-Benz SSK 7.1 L6
André Boillot Private entry Peugeot Peugeot 174S 4.0 L4
Luigi Arcangeli SA Alfa Romeo Alfa Romeo Alfa Romeo 6C-1750 1.8 L6
Baconin Borzacchini SA Alfa Romeo Alfa Romeo Alfa Romeo 6C-1750 1.8 L6

text: 1931 Monaco Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine
Tazio Nuvolari SA Alfa Romeo Alfa Romeo Alfa Romeo 8C-2300 2.3 L8
Goffredo Zehender Scuderia Ferrari Alfa Romeo Alfa Romeo 6C-1750 GS 1.8 L6
Clemente Biondetti Officine A. Maserati Maserati Maserati 26M 2.5 L8
René Dreyfus Officine A. Maserati Maserati Maserati 26M 2.5 L8
Luigi Fagioli Officine A. Maserati Maserati Maserati 26M 2.5 L8
Carlo Pedrazzini Private entry Maserati Maserati 26B 2.0 L8
Hans Stuber Private entry Bugatti Bugatti T35C 2.0 L8

Question: What was the engine when the chassis was a Bugatti T51 and the competitor was a privateer for the 1931 Monaco Grand Prix?