Production D.VII aircraft initially used the 180 hp Mercedes D.IIIa, followed by the high-compression 200 hp Mercedes D.IIIaü. Modern sources, however, commonly refer to these engines under the generic designation of "160 hp Mercedes D.III." A small number of D.VIIs received the "overcompressed" 185 hp BMW IIIa, a development of the old Mercedes engine that combined increased displacement, higher compression, and an alititude-adjusting carburetor to markedly increase speed and climb at high altitude. Because the BMW IIIa was overcompressed, using full throttle at altitudes below 2,000 meters risked detonation and damage to the engine. In an emergency, however, using full throttle at low altitudes could produce up to 240 hp.
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