Sun Jun 15, 2014 4:22 am by strop
Agreed, while the parameters for the engine publicly available for things like BTCC etc. aren't much beyond what's been specified in this thread, except a vague "low cost to produce and maintain" (and for example a proposed ceiling of 25000 GBP for the BTCC, though that isn't the same as material cost), other factors come into play here, namely the fact that the cars used must be based on large volume mass produced models. Those cars generally don't have giant fat grilles all over the place, for one thing.
Therefore I'd support a leaner material cost and maximum man hours restriction. I'd also support a maximum cooling requirement, which would effectively put a cap on the amount of power, as well as just how much boost the turbo puts out, and also mitigate the concern over whether the 30K MTBF requirement will be affected by lack of chassis cooling, since touring car rules require the front to have a radiator grille anyway.