straight-six

noun2

1. •
   An internal combustion engine, with six cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft.

   • He spent extra for a V8 because he doubted that a straight-six would be enough for towing his trailer.
2. •
   (old-fashioned) A vehicle with such an engine.

   • His grandpa was driving a straight-six at a time when few people had one.