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_53713 ( "engine name" text, "engine code(s)" text, "valvetrain" text, "displacement" text, "max. power at rpm" text, "max. torque at rpm" text )

### Question ###
What is the maximum torque at rpm for the engine with code BMM?

### Accurate SQL ###

SELECT "max. torque at rpm" FROM table_53713 WHERE "engine code(s)" = 'bmm'