Once again the emotive topic of engine (un)freezes has reared its head, so much so that last Friday, Formula 1 tsar Bernie Ecclestone called a special meeting of all team principals to discuss the question of changing the current process by which engines can be upgraded annually.
In keeping with F1's best traditions of schizophrenically complicating even the simplest tasks, the meeting was hardly straightforward. The basic thrust was to amend the (decreasing) number of "upgrade tokens" issued to engine suppliers over the seven-year life cycle of homologated power units to enable Ferrari/Renault to play catch-up with Mercedes.
Basically, power units are divided into 42 categories, each of which has a weighting between one and three - providing a total of 66 "tokens" to be used for upgrades. Next year 61 items may be modified, decreasing at the rate of 10 each for 2016/7, a further eight in 2018 and down to only three each for 2019/20. See Page 89 of the 2014 Technical Regulations for details.