DB605AS info - need to determine WHERE and WHEN?

[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.

[Eduardo]

The Americans found at least two Bf109 with AS-o engine in France.
One G-5 serial 110351 at Corbeil and another G-5 at Caen.They were all High altitude fighter with Press cockpit.These may br a clue.

Eduardo.

[schwarze-man]

Hi Eduardo,
My info is that the 0 series engines were early production with shorter overhaul lives for trend monitoring. I suspect that this practice ended late in the war as there is no mention of an 0 series in the 605DB/DC documentation that I have. The latest 0 series I have seen is a DB605DM-0. 605AS-0 would have come earlier and, I would expect the 605ASM-0 also existed as an 0 (zero) series.

[Eduardo]

Hi,
I am not an expert in Daimler engines but I can only say that all Bf 109 with 605 AS-O found ,including the 26108 were G-5 .The G-5 had a compressor in the right side of the engine to build up cabin pressure .
Eduardo.