Hi Tony
All 100 and 600/700 series Merlins were fuel injected. Royces opted to use single-point injection into the supercharger rather than the German direct injection “diesel fashion”. One reason was that you get evaporative cooling in the induction system, a kind of intercooling effect. The Germans also had vast experience of building diesel fuel pumps pre-war, they are pretty precision pieces of kit.
Without the cooling effect, Di is one reason why German V12s are about 30% bigger capacity for the same power output, although I have noticed that they were not much heavier than Merlins.
There are a few injected Merlins in warbirds, so the Hurricane story could well be true.
Peter

Cheers dude…good stuff…btw my Merlin could not go in my front room in the end as the floor boards would not take it 🙁