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| The DB603 engine The development of the DB603 by Daimler-Benz with started in 1936 at the request of the RLM which sought a more powerful engine at high altitude for its hunters of first line. The DB603 had a series production being located according to sources' between 8000 and 9000 engines all poured confused. The DB603 amongst other things equipped Me410, He177 and He219, Do335 and well on the C version of the Fw190, like some prototype specimens of the version D and Ta152.Extrapolated from DB601 of 33,9 liter of cubic capacity equipping Bf109, this engine of 12 cylinders out of V (with 60°) reversed, had 4 valves per cylinder and 44,5 liters of cubic capacity, was cools by liquid and had a hub of hollow propeller allowing the passage of an axial gun of 30mm. In front of the high costs of development announced and the powers reached in 1937 (1400 with 1500CV), the RLM stopped the project but authorized nevertheless Daimler Benz to continue the development on its own funds, the engineering and design department of Daimler-Benz while having made the request, estimating that this engine had still potential of development. An assessment of the situation was required by the RLM in 1939 when Daimler-Benz announced that the engine had briefly reached 2800CV with the bench and that the engineers considered it possible to be able to push this engine until 3500CV ! A first order of 120 engines had placed at the beginning of 1940. The manufacture of the series started only in 1941, and only after Daimler-Benz already scalded by the tergiversations and the reversals of the RLM, be informed with precision of the estimated requirements out of engine.  Indeed, this order was going to prevent for lack of resources from developing the prototypes during a certain time, and Daimler-Benz probably wished to deaden the funds invested until there. This antagonism concerning the DB603 between the RLM and Daimler-Benz lasted until the end of the war and probably attached the development of the engine which was isolated of all the great official projects.Compared to the DB601, the DB603 had a coolant circuit under pressure to improve its effectiveness, greater pressure of admission and a better homogeneity of the moteur/hélice unit enabling him to obtain its optimal output with 5700 meters of altitude. An amusing characteristic of this engine was the compression ratio which was different for the cylinders from right-hand side (7,5) and left (7,3). This difference made it possible to compensate for the losses of pressure due to the differences length and in the shape of the conduits of admission. Cooling under pressure was carried out by a mixture of water and of glycol (50/50) for an acceptable maximum temperature of 125°C, the normal temperature was of 115°C on the ground and 112°C with 12000 meters of altitude. The temperature was controlled in this manner to obtain a performance and an optimal safety in rise and mode of combat for all speeds starting from 300 km/h. It y have more than 30 versions of the engine DB603, a number of them were experimental engines intended for the later development of versions of series, if it have as much they is there that the experimental engines were largely subsidized, particularly those intended for versions of hunters of high altitude (more that 7500 meters).  The first versions produced go from A to F; With, B and C are engines turning left and poured them D, E and F is engines turning right; all develop 1750 CV with takeoff. These first versions were then improved at 2000 CV and could be thorough up to 2250 CV with a device MW50. The majority of the produced engines were assembled on twin-engines like He219 and Me410 or on He177 four-engined plane. The latter were failures and did not improve the dimension of the DB603, the persons in charge for the RLM accusing the engines (inter alia things) to mask their own error of judgments. Ta152 showed, towards the end of the war, with brilliance that this engine was excellent. The last developed versions were equipped with compressors on 2 floors with exchanger (DB603N) or with turbocompressors (DB60Ú) making it possible to develop of 2750 CV takeoff, a little more 1500 CV to 9200 meters and to keep sufficient power to make it possible a hunter to remain operational up to 13000 meters of altitude! But she did not know series production.I found only few technical information about this engine, and only for some versions. They are gathered in the table below.
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