Turbo, maybe that's what my son said, >aspirated<, he diffidently said that, he say's diesel's has to have something to blow air in the motor to run, but still I don't see no turbo on my L3400, so that must mean your right about naturally aspirated, which means a diesel motor sucks in air on the intake stroke.I am assuming we are talking about a turbo. Most small diesels are naturally aspirated and don't have turbos.
My son is talking about changing his old straight six gas motor to a diesel motor, to run his shingle mill, if he can find one, the old 261 GMC is getting tired.
https://www.youtube.com/watch?v=gpd3ZOoI7kk