Stirling Engine

The Stirling Engine (formerly known as the Steam Engine) is a BuildCraft Engine that runs on Vanilla Minecraft fuels. The Stirling Engine can be a great source of power for a Quarry if you are able to gather the coal/charcoal to get it running. Three Stirling Engines can run a quarry at a fairly quick pace. Note that they require a Redstone signal to run, as do Combustion Engines.

Stirling Engines will never explode unless the engine itself receives too much power. You can leave one running, for example, and it will never explode unless it is receiving power. The temperature is represented by the color of the central pylon. Blue means it's cool, Green means it's warm, Green - Orange toggle means it's beginning to get hot, Orange means that it is hot, and when its an orange -red toggle then it means it's near or in danger of imminent explosion, but its also where the engine runs most effectively, just as with all other BuildCraft engines.

A tutorial explaining Stirling engines can be found Here.