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_12 (valvetrain VARCHAR, model VARCHAR)
### Question:
What is the Valvetrain of the Diesel Engines Model?
### Answer:
SELECT valvetrain FROM table_name_12 WHERE model = "diesel engines"