vocabulary which I couldn't find in dictionaries

[forum_mail]

what's:

1/ power density
2/ charge dilution
3/ engine breathing
4/ residual gas trapping
5/ fuel composition

that's all for the time being, there will be more.

[RonBee]

Fuel composition would have to be what the fuel is made up of (gasoline, ethanol, etc.). I don't know what the others are. Perhaps you could supply some context?

BTW, I wouldn't bother to look up words in a dictionary. Dictionaries usually offer definitons for single words, not phrases.