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Explanation: refers to engine sizes: the word engines can be used on its own - see "The Citroen C4 Picasso has two 16v petrol engines at its disposal - a 127bhp 1.8 and a two-litre with 143bhp" (http://www.topgear.com/drives/A7/AB/new/) - in this sentence engines would be translated with motorizzazioni in Italian.
But 'engine sizes' is also used:
"The Citroën CX is an automobile produced by the French automaker Citroën from .... were available in various engine sizes including turbocharged versions (en.wikipedia.org/wiki/Citroën_CX)