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Also note that self-ignition would happen when the temperature in the chamber got high enough, which isn't necessarily when you want it to happen. Spark-ignition happens before TDC, which (absent any combustion) would be the point of highest pressure. You do that so the mixture has time to burn while the piston is still in a position in its stroke to turn that into motive power.
Frankly, I'm not sure exactly how older diesels deal with that. I know that a lot of the more modern ones inject directly into the combustion chamber, and that is how they regulate when ignition starts.
Gasoline injected into a diesel motor might burn too quickly???
-soD
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