We all know race engines means high tech and expensive. Because these engines are only produced in small volume and usually working in high load/high stress circumstances, they usually uses some technologies that are not available in massively produced passenger cars.
One interesting fact is, because the race engine has higher assembly precision standards, there is less energy loss due to frictions between internal moving parts. Therefore, some race engines do have better fuel efficiency when comparing to a similar massively produced passenger car engine.
But some good stuff in race engines may act reversely in cars that are designed for daily driving...
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