Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_8 (engine VARCHAR, year VARCHAR, chassis VARCHAR, entrant VARCHAR)
### Question:
Name the engine with chassis of maserati 250f and entrant of luigi piotti with year less than 1957
### Answer:
SELECT engine FROM table_name_8 WHERE chassis = "maserati 250f" AND entrant = "luigi piotti" AND year < 1957