That bsfc is a joke. It is even further into the rubbish idea of allowing a NA engines compete against more efficient turbo engines in lmp1 this year.
On the engine thermal efficiency, any engine provider in 2018 should be achieving over 40%. Simple application of direct injection and a good design should generate figures between 40-44%. Pre-chamber tech would then give the next step change in efficiency and allow better and improved combustion with the lambda figures in excess of 1.15/1.2
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