The Green Monster IV is equipped with V12 aviation piston engines from the manufacturer Allison.
These were installed in the American aircraft Lockheed P-38 Lightning and North-American P-51 Mustang in World War 2. The two engines installed on the tractor each have 28 l displacement and four valves per cylinder. They are mounted one behind the other in steps (stair-step design) and each has different directions of rotation. This stabilizes the tractor during traction.
The biggest technical changes to the engines are the conversion to an electronically controlled injection and ignition system, which not only makes it possible to make major changes to the engine settings by computer between two pulls, but also to call up a large number of stored values and evaluate them. Methanol is used as fuel instead of aviation gasoline. Methanol burns at lower temperatures and ensures a lower thermal load on the engines, making an additional cooling system unnecessary.
The engines are supplied with air by superchargers. The supercharger of the front engine is a complete in-house development that pumps significantly more fresh air into the engine than the originally used supercharger. Power is transmitted via multi-plate centrifugal clutches that become friction-locked at around 1500 rpm. At full throttle, the engines rev up to 4500 rpm. A transmission with only one forward and one reverse gear is installed between the collective transmission, where the power of the two engines is combined, and the rear axle. The tractor was developed to start in the free class 3.5 tons. However, by removing the rear engine, it is also possible to start in the 2.5 t Free Class. The tires, with which the power is transferred to the ground, have the size 30.5-32 and are specially developed for the Tractor Pulling Sport. At full throttle the tires have a wheel speed of approx. 100 km/h.
In addition to many German championship titles, the greatest success of the Green Monster IV is winning the European Championship in the 3.5t Free Class in 2016.