CREATE TABLE table_name_8 (year INT, engine VARCHAR, entrant VARCHAR)

What is the average year that the Belanger Motors had an Offenhauser l4 engine?
SELECT AVG(year) FROM table_name_8 WHERE engine = "offenhauser l4" AND entrant = "belanger motors"
SELECT AVG("year") FROM "table_name_8" WHERE "belanger motors" = "entrant" AND "engine" = "offenhauser l4"