longreach wrote: I think BUT i'm not sure,that the 8000 hp engines in the Graf Spree was the most powerful desiels the germans built.
I'm not sure of all the details, but my references show each of the three Panzerschiffe being equipped with eight MAN 9-cylinder, double acting, two-stroke Diesel engines, four per shaft, 450 RPM, originally rated at 6650 HP normal, 7100 HP max short period HP.
In practice, each of the three ships was a little more powerful that her older sister - the learning curve worked for the Kriegsmarine as well! Deutschland displayed 6750 HP each normal rating during trials, Admiral Scheer 7100 HP, and Admiral Graf Spee even more, though I can't find a specific figure for AGS.
These Diesel engines were the most powerful in the world at the time they were put in service. They proved to be maintenance headaches - cracked cylinders & pistons and continual stuffing box problems (at the lower combustion chamber connecting rod), causing the most common troubles. When AGS entered the River Plate battle, her engines were not anywhere near optimal.
The fuel combustion also wasn't as efficient as hoped - they smoked far more than anyone predicted, much to the dismay of the Kapitan zur See of each ship during their raiding missions.