user: Question: what was the engine when Ken Downing drove an entrant from Connaught Engineering?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['AFM', 'AFM - Küchen', 'AFM', 'Küchen 2.0 V8', 'Hans Stuck', '1']
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Driver" = 'Ken Downing' AND "Entrant" = 'Connaught Engineering';