CREATE TABLE table_53136 ("Entrant" CLOB, "Constructor" CLOB, "Chassis" CLOB, "Engine" CLOB, "Driver" CLOB, "Rounds" CLOB)

what was the engine when ken downing drove an entrant from connaught engineering?
SELECT "Engine" FROM table_53136 WHERE "Driver" = 'ken downing' AND "Entrant" = 'connaught engineering'
SELECT "Engine" FROM "table_53136" WHERE "Driver" = 'ken downing' AND "Entrant" = 'connaught engineering'