The Stalker
I suggest you google on the things you have questions about. Add an IL2 on to the search and it will pull information with IL2.
The
http://'mission4today.com site has a ton of information and even some manuals on Complex engine management.
Also, go to ubisoft
http://forums.ubi.com/eve/forums/a/cfrm/f/25910613
If you hang on these 2 sites and forums you will learn as far back as the origination of IL2. The Ubisoft boards have years of searchable information. There are over a million postings made on the Ubisoft IL2 boards.
You might get some answers here, but mostly this is the IL2 boards occupied by users that have been around awhile. Questions are still answered for the most part by sites like the two above.