While I deeply appreciate any vintage aircraft that is powered by their original engines, I was wondering if there are any modern replacement engines available for the de Havilland Tiger Moth aircraft with Gipsy Major engines installed that require no or minor modifications of either the aircraft and/or the engine itself?
The Avia (now LOM) M132 4 cylinder inverted inline might fit. Some adaptation work is probably required.
No there isn't. The closest thing would be a Fairchild Ranger inverted in-line 6, almost as old and 70 lbs heavier and I don't think it's ever been tried.
The DHC-1 Chipmunk, DeHavilland Canada's first in-house design (and later license built by mother DH in UK), also used the Major, and a lot of them have been modified with opposed Lycomings, but I can't imaging anyone ruining the lines of a T Moth that way.