Originally Posted by PanzerSD

The Air cleaner inlet is already within the engine compartment, Placing cardboard directly in front of the radiator greatly reduces the large volume of supercooled air coming into the engine compartment.
I used a remote temperature probe at one point and measured the ambient air being -30 at idle, and intake air at -48. Driving at partial throttle, with the vehicle in motion, the ambient air moving past the vehicle is at around -40 to -45, and the intake air was a balmy -74*C Whereupon I took my foot off the throttle and it flooded, and for as long as the fuel pump was running, it was pouring fuel into that engine. It took a good couple of hours sitting before it was dry enough to turn over without fuel washing the cylinders (at -30 fuel wash=Death)
If I allow the car to come to operating temperature, and allow all the engine parts to absorb as much heat as they can, there is enough heat in the metal to prevent the freezing from occurring. I imagine when the temps are that low that a humid day all sorts of frost is building up on that sensor plate.