Grand Prix 1961-1965 OP/HS: The 1.5 litre days in F1

From January 1, 1961, a new set of technical regulations were applied in Formula One. From that date, all the naturally aspirated engines had to be of a maximum displacement of 1.5 litres in an attempt to reduce the speeds. The power of these engines was initially about 150 bhp though, at the end of the era, this had risen to more than 220 bhp. Looking back, the "little cars" of that time are sometimes smiled at today, which does not do justice to the achievements in those years of the engi...