CREATE TABLE table_1212189_1 (capacity VARCHAR2, model_engine VARCHAR2)

How many capacities are possible for the 1.6 Duratec model/engine?
SELECT COUNT(capacity) FROM table_1212189_1 WHERE model_engine = "1.6 Duratec"
SELECT COUNT("capacity") FROM "table_1212189_1" WHERE "1.6 Duratec" = "model_engine"