How much does an Asst. Professor - Mechanical Engineering make in North Carolina? The average Asst. Professor - Mechanical Engineering salary in North Carolina is $81,848 as of November 25, 2019, but the range typically falls between $68,591 and $97,133. Salary ranges can vary widely depending on the city and many other important factors, including education, certifications, additional skills, the number of years you have spent in your profession.