This is from the 2014 technical regulations page 88 is about annual engine homologation. As far as I know there has not been any change.
http://www.fia.com/sites/default/fil...2013-12-09.pdf
EDIT: For those of you here who like the technical side of Formula 1 and wants to learn I strongly recommend taking a look at the technical regulations. You don't have to be an engineer to understand most of the rules, also there is some really good drawings and appendixes that helps to explain.
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