A U engine is a piston engine made up of two separate straight engines (complete with separate crankshafts) joined by gears or chains.
The Texas Chain Saw Massacre | The Jesus and Mary Chain | Roller Hockey International | chain | roller coaster | Chain Reaction | Chain store | The Roller Blade Seven | Markov chain | Hudson River Chain | Chain Reaction (song) | wooden roller coaster | Roller Derby World Cup | Nuclear chain reaction | electron transport chain | Chain Bridge | The Prayer Chain | Markov chain Monte Carlo | Main chain of the Alps | chain store | Chain Reaction (game show) | Chain Home | chain drive | bicycle chain | Turtleneck & Chain | The Jesus And Mary Chain | Team Australia (roller derby) | Roller-compacted concrete | Roller chain | Return of the Roller Blade Seven |