Table:
text: 1952 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Engine Driver Rounds
Ludwig Fischer AFM - BMW 8 BMW 328 2.0 L6 Ludwig Fischer 6
Willi Krakau AFM - BMW 6 BMW 328 2.0 L6 Willi Krakau 6
Willi Krakau Krakau - BMW Eigenbau BMW 328 2.0 L6 Harry Merkel 6
Ernst Klodwig Heck - BMW Eigenbau BMW 328 2.0 L6 Ernst Klodwig 6
Rudolf Krause Greifzu - BMW Eigenbau BMW 328 2.0 L6 Rudolf Krause 6
Ken Downing Connaught - Lea Francis A Lea Francis 2.0 L4 Ken Downing 7
Officine Alfieri Maserati Maserati A6GCM Maserati A6 2.0 L6 Felice Bonetto 8
Officine Alfieri Maserati Maserati A6GCM Maserati A6 2.0 L6 Franco Rol 8

text: 1952 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Engine Driver Rounds
Connaught Engineering Connaught - Lea Francis A Lea Francis 2.0 L4 Ken Downing 5
Connaught Engineering Connaught - Lea Francis A Lea Francis 2.0 L4 Eric Thompson 5
Connaught Engineering Connaught - Lea Francis A Lea Francis 2.0 L4 Dennis Poore 5, 8
Connaught Engineering Connaught - Lea Francis A Lea Francis 2.0 L4 Stirling Moss 8
Ecurie Ecosse Cooper - Bristol T20 Bristol BS1 2.0 L6 David Murray 5
G. Caprara Ferrari 500 Ferrari 500 2.0 L4 Roy Salvadori 5
Tony Crook Frazer-Nash - BMW 421 BMW 328 2.0 L6 Tony Crook 5
Marcel Balsa Balsa - BMW Eigenbau BMW 328 2.0 L6 Marcel Balsa 6

text: 1952 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Engine Driver Rounds
Ecurie Belge Simca-Gordini 15 Gordini 1500 1.5 L4 Johnny Claes 4–5
Ecurie Belge Simca-Gordini 15 Gordini 1500 1.5 L4 Paul Frère 7
Scuderia Marzotto Ferrari 166/F2 Ferrari 125 1.5 V12 Franco Comotti 4
Scuderia Marzotto Ferrari 166/F2 Ferrari 125 1.5 V12 Piero Carini 4, 6
Archie Bryde AHM Bryde Cooper - Bristol T20 Bristol BS1 2.0 L6 Mike Hawthorn 4
Archie Bryde AHM Bryde Cooper - Bristol T20 Bristol BS1 2.0 L6 Reg Parnell 5
W.S. Aston Aston-Butterworth NB41 Butterworth 2.0 F4 Bill Aston 5–6, 8
Connaught Engineering Connaught - Lea Francis A Lea Francis 2.0 L4 Kenneth McAlpine 5, 8

Question: What was the engine when Ken Downing drove a Connaught Engineering competitor team and driver in the 1952 Formula 1 season?