We are looking at placing a normally asspirated diesel engine in a few cold climate. The engineroom will normally be heated. When the engine runs there is a ventilation system that will start up and draw outside air and also expel air from the engine room to outside, this is necessary otherwise the engine will get too hot without air flow about the block. A thermostatic control is not allowed on the ventilation. Note: The fuel is good for this temp. No doubt with such cold and hence dense air the engine will produce every hp it is rated for. My concern is wether or not there is any thing special to do for a diesel engine that maybe drawing -30C intake air.