When did engine capacity start being measured in CC?

[Mark McKibbin]

In retrospect it seems silly that anything other than capacity would be used as a racing formula but certainly Voiturette racing of around 1905-10 was something like One cylinder cars 100mm bore, two cylinder cars 75mm bore and 4 cylinder cars 65mm bores.  So those  like the Sizaire Naudin mono or later the Peugeot V twin  had crazy long strokes and won everything, a capacity rule would have fixed it.