I'm searching for some informartion about engines. I think I can fairly look at a car's body and say how it affects airflow (not as good as many around here, but I try

), but my knowledge of how an engine works is a bit lower than I would like it to be...
For example, I don't quite understand the terms that I put in the title of this thread. I know the basics of an engine: the air/fuel misture enters the cylinder throught the valves, the piston goes up and downs, the "vilebrequin" (French term, don't know it in English) turns and passes that movement to the "veio de transmissão" (Portuguese term, don't know it in English). But I could use some good information, I don't want you to take the time to write an essay here, but maybe you could point me to some websites related to this subject.
Another doubt that I have is the "differential autobloquant" (french, dunno the english name, in Portuguese we call it "diferencial autobloquante"). I think it is something that locks the inside and outside wheel when under acelaration, but I can be wrong...
Thanks in advance,
Filipe Cadete