Not on the Bf 110, but if memory serves there were projects for the Me 410/BMW 801.
Most of the reason is that (at least at the beginning of the war 1939-42 ) they did not have sufficiently strong (and large) radial engines.
Both BMW 132 and Bramo 323 only approached 1000 hp in the latest versions (and only for short-term loads anyway).
Both companies started to develop 14 cylinder versions towards 1700-2000+ HP which after unification resulted in BMW 801.
What they didn't have were the 14 cylinder BMW 132 and Bramo 323 versions with 1200 - 1500 hp.
And these would be strong enough for fighter-bomber versions of the Bf 110 and/or Do 17 and He 111. Or Bf 109X .
Actually, look at the long and good discussion in the what iff section of the forum.
re 2000 BHP 14-cylinder radial by Bramo being designed/tested
It was the Bramo 300 (I think). I do not know if it reached bench testing and made 2000 BHP as a complete engine? In my notes I have it as being fed air by an externally powered S/C to test the components of the bare engine, and that there were serious cooling issues. My notes say this was in early-1939. I have no idea how authoritative this info is, as it was not from original source documents.
The 329 was too small (I think) at 41.7 L for 2000 BHP output with out significant advances in S/C and later C3 fuel.
Ah, I finally got a computer,my last one crashed and burned.I was wondering how the BF110 would have performed if it used the BMW radial engines that the FW190 used?I always thought the speed would have been better.What do you guys think?Thanks.