Shown here are destroyed German Aerial engines post Armistice in a German service depot.
As the Aerial service was by the start of ww1 still in a relative infancy it was no surprise that during August 1914 only 78 German Aerial engines were produced, unsurprisingly though this would stay the lowest monthly output as the air would keep filling up with more airplanes and airships, the monthly max was reached by October 1918 when 2031 engines were produced for aircraft of all types.
The total amount of engines built during the war has been listed as 43.486 in total but there has been suggestions that it was lower at 40.449 or even as high as 49.438 with the latter coming from a 1921 poll.
Engine production between 1 August 1914 and November 30 1918:
Adler-Werke, former Heinrich Kleyer (Frankfurt) produced 3.
Argus-Motoren-Gesellschaft (Berlin) produced 1.453.
Basse & Selve (Altena) produced 370.
Bayerische Motorenwerke (München) produced 642.
Benz & Cie. (Mannheim) produced 11.256.
Daimler Motorengesellschaft (Untertürkheim) produced 20.131.
Gasmotorenfabrik Deutz (Köln-Deutz) produced 387.
Güldner Motorengesellschaft (Aschaffenburg) produced 63.
Gebr. Körting A.G. (Körtingsdorf) produced 36.
Maschinengabrik Augsburg (Werk Nürnberg) produced 326.
Maschinenfabrik Augsburg (Werk Nürnberg) produced 87.
Maschinenfabrik Riedinger (Augsburg) produced 3.
Maybach Motorenbau (Friedrichshafen) produced 1.123.
Nationale Automobilgesellschaft (Berlin) produced 774.
Motorenfabrik Oberursel (Oberursel) produced 2.933.
Adam Opel (Rüsselsheim) produced 2.260.
Otto Schwade & Co. (Erfurt) produced 75.
Stoewer-Werke A.G. (Stettin) produced 468.
Gandenbergsche Maschinenfabrik Goebel (Darmst.) produced 219.
Rhemag-Rhenania Motorenfabrik (Mannheim) produced 308.
Siemens & Halske A.G. (Blockwerk Berlin) produced 569.
In total these count towards 43.486.
Of these around 28.000 survived until the end of the war when most would be surrendered to the Allies or be destroyed to prevent them from falling into their hands.
Source: German & Austro-Hungarian Aero Engines of WW1 | Vol. 1