Originally Posted by Jabawocky
Cars....another problem altogether and why they have BSFC's that are usually worse than our old Lycosaurus and CMI's.
Apples and oranges.
Cars need to conform to very strict emission standards, whereas aircraft don't. I haven't seen an aircraft with even a catalytic converter, let alone any specific design feature, such as increasing fuel flow to lower the combustion temperature to maintain NOx emissions within limits, etc. Primary objective in an aircraft engine is reliability, but for a car engine, reliability is not such a concern (as long as it lasts until the end of warranty), but the COx, NOx and diesel particles emissions - and of course fuel consumption - are of much greater significance.
Try to achieve modern emission standards with 60-years old Lyco/Conti design and then compare BSFC. You're in for a shock.