Why Honda's F1 engine is just not working out.

Mark Hughes for Motor Sport:

The turbo’s compressor is too small – part of that ‘size zero’ concept – and cannot be made to run fast enough to compensate in terms of creating enough heat to give the ersH something to work with. But whether the breakthrough even comes next season could depend upon what happens with the engine homologation regulations. As things currently stand, the engine token system reverts in 2016 to how it was in 2014. i.e. tokens cannot be spent during the season

Fascinating analysis of the underlying design issues holding McLaren-Honda back in F1 this season.