All engines prefer cool air as it's more dense and so contains more oxygen molecules for a given volume, hence bigger bang. I don't know of any injection system that has any requirement for warm air Carburettor icing is a big issue on piston engine aircraft with carbs, especially in conditions of high humidity and low throttie openings, such as on an approach. All such aircraft have a carb heat control to offset this undesirable adiabatic effect.
Then why does a Rover HotWire +8 have such elaborate stuff to heat this cool air?
I will answer My own question. It is because Rover designs engines that will be operated under all sorts of climate extremes through out the World.
But Why would I care as I am using this engine in a very special Sports Car in the Northern Middle Hemisphere in general and specifically in the Pacific NW of U.S. where the Japanese Currents keep us warm and wet.
Carburettor icing is a big issue on piston engine aircraft with carbs, especially in conditions of high humidity and low throttie openings, such as on an approach. All such aircraft have a carb heat control to offset this undesirable adiabatic effect.