pump. Its roller crankshaft bolted together from individual segments belongs among unique technical solutions. The engine is available in emission specifications Euro II - Euro III with power output ranging from and torque. At its launch, the T815 could alternatively be delivered with a larger powertrain. Available options, all of which were from Tatra's own range of engines, included the air-cooled V10 (15.8 litre) and V12 (19 litre), both without turbo and intercooler, and a V12 bi-turbo. When the Euro I emission limits came into effect, the larger engine alternatives became unavailable. The 815 can also be fitted with water-cooled engines made by other manufacturers - notably Cummins and Deutz with power ranging from with torque. The most powerful MTU engine that was used in a 815 prototype tank prime mover, had an output of displacing 21,930 cc. Transmission Manually controlled mechanical Tatra transmission which is mounted directly on the auxiliary transmission case, and which, therefore, is an integrated part of the chassis with 10 or 14 gears with two auxiliary gears. An electronically controlled gear shifting Tatra - a driver using a joystick just pre-sets a speed gear, and after the clutch is engaged, the speed shifting is carried out. The driver is informed about the shifted speed gear by means of a dashboard display. Twin Disc which is a six-gear auto transmission of 1189 or 1177 type Allison six or seven-gear automatic transmission with a compact construction in one case, with a torque converter, which are mounted directly on the engine Cab Tatra T815 is equipped with own Tatra-produced COE cab. There is basic version, extended version with room behind seats used for a berth and especially for fire-fighting applications a long four-door cab enabling transportation of up to six persons. There is also special low cab version used mostly for cranes and other special applications. The cab is situated in front of the front axle. Equipment Trucks equipped with air-bellows suspension have possibility of a ground clearance regulation. Special protective surface finish Central tyre inflation system enabling deflation/inflation of tyres during the drive in boggy terrain (standard for military versions, on demand for civilian) Multi-fuel engines for military version (on demand) Vehicle radio-shielding as per NATO standards for military version Possibility of additional cab ballistic protection through a supplied and subsequently installed additional armouring set intended also for windows for military version Variants Civilian Tatra 815 Tatra