Meyer,
AM and ASM engines run on the same MAP, 1.7ata, for the same output, 1800 PS @ SL. Early DM engines run at 1.75ata for 1800 PS, but most were DB or DC config, for 1.8ata or 1.9ata or 1.98ata, ranging from 1850 to 2000 PS. Keep in mind AS ones were little more than 605As with a 603G compressor built into them, the D engines were rather different in many aspects. As for the appearance of MW50 and large compressors, both were in action by April 1944, these planes being factory modified earlier planes to new standards, G-5s and G-6s. AFAIK Mtt was seriously toying with MW 50 in the last months of 1943, so probably it took a few months to get the results on the fronts. As for the Dora`s, they required B-4 fuel, unlike the 190As, so if there was specific shortage of C-3, which I am sceptical about, it wasn`t because of the Doras, but the Antons.
I am 99% certain the lower speed on the high alt AS and D engines are not from the larger compressor, the table clearly tells the very same power output, 1740 PS yields different results. Certainly not becuase the MK 108 installation, I doubt anybody would notice that mere 36 kg extra weight that came with it, both gun and ammo weight .. The larger propellor blades of the AS/D engines, designed to grab thin air of high alts, but creating more drag than neccesary at low alts (propellors work much like wings, more area = more drag). Other factors are the different cowling, here the AS/D ones with the Type 100 and Type 110 (the latter being w/o D engine`s bulges, found on some Erla G-10s only) has a decided advantage over the older 13mm HMG bulge featuring cowling.. but there`s also the if it`s long or short tailwheel, both could be found on both versions, and were rather influental on the final speeds, hence most of the 109Ks speed advantage over the G-10.
