As Barbi puts much much stock in what Oliver Lefebvre says, this is what he said on the DB601N engines:
Wastel are you sure about the E-7/N for 41 ? AFAIR my delivery data show a much lower amount of E-7 with the DB601N. While the E-7 was planned for use with the DB601N, the installation of this engien was quite troublesome on the Emil and few were actually fitted with it.
I'll try to come up with my numbers if the documents have not already been packed away...
http://www.allaboutwarfare.com/forum...=515&hl=db601n