CREATE TABLE table_name_74 (year INT, engine VARCHAR)

What year was the cosworth ca2006 2.4 v8 4 series used?
SELECT AVG(year) FROM table_name_74 WHERE engine = "cosworth ca2006 2.4 v8 4 series"
SELECT AVG("year") FROM "table_name_74" WHERE "cosworth ca2006 2.4 v8 4 series" = "engine"