Originally Posted by HipToBeSquare
Porsche 3.8 liter X51. 408 naturally aspirated H6 power.
Lamborghini/Audi 5.2 liter V10.
I am not an automotive power-train engineer, but others are.
Yeah we all know how BMW's V10 worked out in the emissions department... terrible fuel economy when put in those big boats. Their current n/a V8 didn't work out well either or they wouldn't have just scrapped it like that. The other problem with the high revving engines is that there is basically no application for them outside of these low production cars, so cost sharing becomes difficult.
For the record I like high revving n/a engines. But I think they are pointless in M cars because M cars are too heavy now and they've been that way for about 10 years. When I drove the now-outgoing V10 M5 a couple years ago I wasn't impressed because the car was too heavy. Big fat vehicles like that need torque.