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?
No idea, maybe you answered yourself, but found some useful stuff here. Generally fuel injected engines don't suffer from intake icing as despite having a throttle butterfly causing depression, they don't have fuel atomisation taking place in the vicinity of same (which would further lower the temperature) as fuel is injected downstream.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
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.