Bf 109 identity

[Harri Pihl]

Olivier,
I don't know any dates. According to Valtonen (he refers some sort of LW memo) it was planned to switch to higher CR after a small serie of lower CR engines but in reality there certainly was quite large number of low CR engines (the Finnish air force AS planes with lower CR engines were delivered summer 1944). Most probably there were several versions of AS engines (high and low CR etc.) in production same time depending on manufacturer.

Generally it's difficult find exact documentation on these because there is quite a lot confusing documentation. So in practice pictorial evidence seem to give most reliable view.

[olefebvre]

Ok that's what i though. Indeed plans were made to increase the CR early on but this did not come to fruition until late 1944 and the engine so modified suffered from reliability problems due to C3 fuel quality. ASC/DC clearance did not come until february 45.

[Harri Pihl]

Olivier,
I checked couple microfilms to find out which engines were actually produced. The designations for the DB 605AM and ASM used for the G-14 (and apparently for the G-6 too) appear to be according to specification :

9-605-2213 for the AM
9-605-2223 for the ASM

Then I have practically unreadable power curve sheet which (might) give following designations:

9-605-2218 for the AM
9-605-2230 for the ASM

Do you know the designation(s) for the DB605AS? (there probably is several versions as the original plan was to build only 200 with lower CR according to Valtonen).

Of above listed engines at least the 2213 should be with higher compression ratio, but I'll try to find more documents on this.