The buzzin' dozen is a nickname for the Detroit Diesel 12V71, 12V92, or 12V149 series of two-stroke V12 engines. These engines fire every time a piston reaches the top of its stroke, producing a distinctively loud, high-pitched exhaust howl at operating speed. Mechanics revere them for their durability and the massive torque they deliver in heavy equipment.
Heard on the job
You can hear that buzzin' dozen coming from a mile away when it's pulling a heavy load up the grade.
Insider tip
These engines are infamous for leaking oil, with mechanics joking that if a Detroit Diesel is not leaking, it is out of oil.