Panzer VIII Maus
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armoured fighting vehicle ever built. Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by advancing Soviet military forces.
Engine
The largest internal combustion engine ever built is the Wärtsilä-Sulzer RTA96-C, a 14-cylinder, 2-stroke turbocharged diesel engine that was designed to power the "Emma Mærsk", the largest container ship in the world. This engine has a mass of 2,300 tonnes, and when running at 102 RPM (1.7 Hz) produces over 80 MW, and can use up to 250 tonnes of fuel each day.