gearhead       
noun [ C ] mainly US informal uk/ˈɡɪə.hed/ us/ˈɡɪr.hed/
 (指对汽车或新科技设备着迷的)设备发烧友
someone who is very interested in machines and how they work, especially cars and other vehicles
  Ed was a gearhead who liked to restore classic automobiles. 艾德是一个爱好修复经典汽车的设备发烧友。 
 - More examples
 - He is a gearhead who owns and flies his own small plane.
 - He is fascinated by the ancient steam boiler. "I've always been a gearhead," he says.
 - The artist is a selfdescribed "gearhead" and his lifelong interest in engines shows in some of his sculptures.
 - Fast RAM is almost never worth the money, unless you're a dedicated gamer or gearhead.
 - The company has the engineering and computer power, plus legions of brilliant gearhead programmers, that it needs to succeed.