Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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

### Accurate SQL ###

SELECT engine FROM table_name_8 WHERE chassis = "maserati 250f" AND entrant = "luigi piotti" AND year < 1957