CREATE TABLE table_74643 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Engine" TEXT, "Driver" TEXT)

What engine is used by Colin Bennett Racing with an 811 chassis?
SELECT "Engine" FROM table_74643 WHERE "Entrant" = 'colin bennett racing' AND "Chassis" = '811'
SELECT "Engine" FROM "table_74643" WHERE "Chassis" = '811' AND "Entrant" = 'colin bennett racing'