Quote:
Originally Posted by red-beard
With the exception of CATS, computer controlled fuel injection with O2 sensors and lighter materials, the IC hasn't changed much since the 1930's. I have text books on ICs from the 1930's that cover even fuel injection, super charging and turbocharging.
The fuel efficiency on cars isn't coming from the engines, it is coming from reducing weight and making the bodies more areodynamic. There are some improvements from fuel injection, but not as much.
Fuel economy took a hit in the 1990's, as the weight of cars increased with the mandatory protective systems.
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ICE evolution isn't at the steep part of the curve anymore, but everything about them has come a LONG way since the 1930's. Metallurgy, environmental impacts of production, smoothness, longevity, peak power AND overall power (over entire operating range). Computers have given the biggest push, both in physical engineering (FE, fluid, computational, etc.) and running the systems. There are still a few big ones left, and you'll see a couple in the coming decade.
Transmissions have also come a long way. And again, computers are mostly to thank. But 6 speeds are becoming the norm, and 8 speeds will be normal pretty soon. CVTs have come a long way. Computer shifted manuals are coming along.
Just look at the peak power outputs of the early 1980's for any given displacement, then measure today. Double the power.
Yet better fuel economy (many thanks to things you mentioned as well) despite increasing weight and greater rolling resistance from ever wider tires (as tastes change).