Why hasn't diesel caught on much for aircraft engines? The list of diesel aircraft engines on Wikipedia is very short.
The reason I see mentioned is their poorer power-to-weight ratios. (e.g. What are the advantages/disadvantages of diesel/Jet A-1 piston engine?)
I knew this was true in the past but is it true even today? Does anyone have values comparing the power-to-weight rations of typical diesel vs gasoline engines, say for automotive use?
Also, doesn't the better efficiency, especially at higher altitudes compensate for the poorer power-to-weight ratio by allowing lesser fuel and more payload?
50 years ago diesel engines for automobiles were uncommon too but in the last decade they have been steadily making headway in the car market. Do the same developments translate to the aircraft engine selection too?
Other than weight, are there any other disadvantages of diesel?