??? Please provide some references - apart from an unreferenced Wikipedia article - to prove this one.
The RLM kept changing its mind about what should be fitted with the DB 601 N.
Mankau and Petrick's Bf 110/Me 210/Me 410 covers the saga with minutes from various meetings.
24/5/40
1,000 of the new engines are expected by January 1941 and the possibility of extending the use of the new engine from the Bf 109 F-1 and F-2 is discussed.
31/5/40
Only the Bf 109 F will be powered by the new engine,later production of the DB 601 N for the Bf 110 will be explored at a later date.
7/6/40
New program adopted in which both the Bf 109 and Bf 110 are to be powered by the DB 601 N.
1/7/40
Bf 110 C W.Nr.2143 is serving as the prototype for the installation of the DB 601 N.
19/7/40
The 601 N engines in stock are to be used to convert the Bf 110s currently in front line service. This stops conversion of Bf 109 E units. The Bf 109 F series retains the DB 601 N.
26/7/40
Further conversion to the 601 N,other than for zerstorer groups already undergoing conversuion is halted. The decision as to whether refitting can occurr at a later date is not expected until the end of August.
9/8/40
That decision is taken. 70 engines per month are to be allocated for monthly production of 30 replacement Bf 110s and 10 Bf 109s. This is in conjunction with the mandated refitting of three Bf 110 zerstorer groups and one Bf 109 group already reengined.
In addition a rotating reserve of 30 engines is to be maintained in reserve
,roughly 10% of the 280 engines currently installed on operational aircraft
[my italics,your 300 Fw 187 don't even have one engine each!]
10/8/40
The Luftwaffe reports a strength of 444 zerstorer aircraft
[with 280 DB 601 N fitted,some on Bf 109s,it is obvious that most Bf 110s could not have had the new engine fitted]
30/8/40
The RLM wants 45 DB 601 N engines in reserve for September,35 in October and then 30 a month until a total reserve of 180 engines is built up to supplement the 280 'active'engines.
14/9/40
Ob.d.L. reports total Bf 110 strength as 332.
27/9/40
The Chief of the General Staff has decided to maintain four Bf 110 groups with the 601 N. The remaining 601 N engines will be distributed 1/3 for rotating stock and 2/3 for fitting to Bf 109 airframes.
18/10/40
Not possible to fit any more Bf 109 E aircraft with the DB 601 N other than the group already converted.
The current 601 N production run is prioritised as follows:
1 Fitting to Bf 109 F
2 Fitting in all newly built Bf 110s
3 Installation in 40 Bf 109 E (conversions) to maintain the existing converted group's strength.
4 Rotating reserve supply for 1-3 above.
6/11/40
The DB 601 N is to be primarily fitted to the Bf 109 E. The November and December production of Bf 110s will be fitted with the DB 601 A engine. Engines will be allocated as follows:
1 Bf 109 E production
2 replacement engines for III./ZG 26 and EpGr. 210.
If insufficient engines are available then II./ZG 26 and II./ZG 76 may have their DB 601 N engines swapped for DB 601 As.
22/1/41
A message on the C3 fuel situation suggests fitting the DB 601 A to the Bf 110. This seems to have been ignored.
As of 1/1/41 there were 432 operational DB 601 N engines reported by units. This is for all types,including for example the He 111 P and Do 215.
153 Bf 110s of all types are reported as being fitted with the DB 601 N,slightly less than half the reported total strength.
The plan for 1/4/41 was to have 850 operational DB 601 N engines,a total stock of 1230. C3 fuel was to be allocated accordingly.
I think this now takes us beyond the period in question. With a decision making process like this it's incredible that Germany managed to carry on until 1945
Cheers
Steve