Some engine and aircraft combinations are more prone to icing than others
What makes some combinations more / less prone? If an engine installation can be made less prone to icing by careful airframe design, I would imagine that the US product liability lawyers would have made a big issue (and a lot of money) about it....?
If the solution is to put the air intake in a warm spot under the cowling, surely this would mean that there is a power reduction similar to using carb heat?