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.
Leclerc tank
The Leclerc has an eight-cylinder SACM (now Wärtsilä) V8X-1500 1,500 hp Hyperbar diesel engine and a Renk AG automatic transmission, with five forward and two reverse gears. The official maximum speed by road is 72 km/h and 55 km/h cross country (speeds in excess of 80 km/h were reported on road). The maximum range is given as 550 km, and can be extended to 650 km with removable external tanks. The "hyperbar" system integrates a Turbomeca TM 307B gas turbine in the engine, acting both as a turbocharger and an APU giving auxiliary power to all systems when the main engine is shut down. The Hyperbar name comes from the unusually high boost pressure of 7.5 bar and the resulting mean effective pressure of 32.1 bar. To compare, the largest diesel engine in the world (the Wärtsila RTA96) has a mean effective pressure of 18.6 bar. In addition, with boost available even at idle, this arrangement also works as an anti-lag system.