DB605AS info - need to determine WHERE and WHEN?

[George Hopp]

Thank you very much for the codes, Tomislav.

[S Sheflin]

Tomislav,

Regarding your list of DB 605 producers, I show the following Hersteller codes and manufacturers for two of them:

002 (A-1) = Pommersche MB (hss)*
004 (A-1) = Fiat, S.A., Turin (kwm)**

*I cannot recall why now, but I have always listed the “002” series as being produced by Pommersche MB. However, several of my sources list the maker codes as “hss,” Niedersächsische Motorenwerke G.m.b.H., Braunschweig-Querum, Steinriedendamm 15, and not Pommersche MB. Any suggestions.

**I only have four 004 listings. Two of the four listings show “kwn” (Donau-Flugzeugbau, Csepel-Budapest) as the maker, but I think it may have been Fiat (kwm).

Steve Sheflin

[S Sheflin]

A PS to my last posting:

My source for the "kwn" references are Crashed Enemy Aircraft (CEA) report 257.

Steve Sheflin

[Mermet]

Hi,

The letter "O" in DB 605 ASO, DMO, ASMO is for "Oktan-Selektor". This device permitted indifferently the use of B4 or C3 fuel.
On the late versions of the DB 605, i.e. DB 605 D, the O was replaced by B for B4 fuel and D for C3 fuel and MW 50, giving respectively the DB 605 DB and the DB 605 DC.
That was the same for the DB 605 ASB and DB 605 ASC which appeared at the beginning of 1945.
If you study the different engine WNr series you'll see that the engines with the suffix "O" have higher WNr than the first version to which they are attached : DB 605 ASMO have higher WNr than the DB 605 ASM, DB 605 DMO have higher WNr than DB 605 DM and lower WNr than DB 605 DB/DC, etc.
It's clear the suffix "O" is the letter and not the digit "0"... and means really "Oktan-Selektor".

Cheers,
JCM

[olefebvre]

It was not only the late 605 versions, the A version also became the DB605AB as underlined by maintenance documents.

[George Hopp]

I

t was not only the late 605 versions, the A version also became the DB605AB as underlined by maintenance documents.

I'm sorry, Olivier, but I don't quite understand what you are saying because, as I recall, the only difference between the 605A and 605B was their reduction gearing.

[the_ivan]

He means DB 605 AB, i.e. a DB 605 A (AM) set to run at 1.45/1.80 ata, not the "plain" DB 605 A-B.

[olefebvre]

Exactly.

[George Hopp]

Thank you for that. It appears we need to memorize a completely new nomenclature here.

In looking through other DB 605 engine numbers, I have a feeling that since Genshagen was, so to speak, DB's home ground it would be most convenient for DB to pull the test engines off that production line, such as the several ASo engines mentioned. I also have a couple of test 605Gs from that factory: 007 00912 and 007 01237.

[schwarze-man]

Sorry, no info on "oktan selektor" in my references, only precise details for setting-up injection pumps to suit specific late engines (DB/DC).
0 series engines were usually early production of a new type.
HTH