Why do carmakers constantly come out with new engine designs instead of refining existing ones? Like they will have a tried and true, economical, reliable, performant engine known to be bulletproof and then shelve it in favor of a new engine that turns out to be a shoddy piece of shit nobody likes.

Emissions.
Then again, /o/ seethes that Nissan is sticking the VQ37 or whatever that V6 was called to everything
>BAWW IT'S OLD COME UP WITH SOMETHING NEW

>>28506037 (OP)
Chevrolet Small Block V8, is producing since 1955 and is still in production today. While it's no longer a standard engine in new GM vehicles, it continues to be produced for crate engine and aftermarket sales.

clean sheet designs are required to make significant gains in power and/or efficiency