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_91 ( driver VARCHAR, time_retired VARCHAR, grid VARCHAR )

### Question ###
Who drive the car that retired due to engine failure and a grid of less than 9?

### Accurate SQL ###

SELECT driver FROM table_name_91 WHERE time_retired = "engine" AND grid < 9