Quote:
Originally Posted by haen
No, I don't care about HP/liter and neither should you. It's not like there are engine displacement restrictions for production cars.
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Basically incorrect here. There are very heavy taxes in many EU countries based on displacement alone. Hence why many cars are infinitesimally lower in displacement than a rounded number in liters (specifically M3 = 3.999 l, taxes for 4.0 l and above). The reason you should care about hp/l is not for the performance it gives you in your car but because it is a challenge of extremely difficult engineering. It is simply doing more with less which is univerally valued in just about any endevour. In competitive auto racing where you have a displacement limit this is obviously the key to a great engine at a given displacement.