Engines
From VGA Planets Wiki
Engines are ship modules that propel said ships at varying warp speeds and fuel efficiencies. Every type of engine is rated to a certain warp factor: a Transwarp Drive is fuel-efficient at warp 9, whereas a StarDrive 1 is only fuel-efficient at warp 1.
The fuel usage of a given engine increases dramatically as you overclock the engine past its recommended rating.
While a StarDrive 1 engine [b]can[/b] travel at warp 9, it is tremendously wasteful of fuel and is not recommended.
Always put the best engine you can afford onto your ships!