The latest concept is a small four-cylinder running on synthetic fuel that can achieve 71 mpg in an EREV platform.

You might have heard about high compression ratios, but what exactly are they, and what kind of effect do they have on an ...

[Stay on top of transportation news: Get TTNews in your inbox.] Advanced researchers and engine makers say the internal combustion engine’s ability to be more efficient and run on greener fuels means ...

Finnish manufacturer Wärtsilä introduced an engine back in 2015 that was so good, it snagged a Guinness World Records title for being the most efficient four-stroke diesel engine shortly after its ...

NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of ...

Astro Mechanica's engine operates in three distinct modes: Mode 1 uses an electric motor to spin the "blisk" – a bladed disk the company makes in-house that acts as the compressor/turbofan instead of ...

Cummins released details of its 2027 X15 diesel engine, which it says meets EPA 2027 emissions requirements while improving fuel economy — and without adding weight or using more diesel exhaust fluid.

Astron aerospace has shown a partial prototype of a new rotary combustion engine it claims runs at an extraordinary 60% thermal efficiency, burning totally clean with zero NOx emissions and nothing ...

A new hybrid engine concept developed by Horse Powertrain, powered by 100 percent renewable ...

Rolls-Royce has hiked the durability improvement target for its Trent engine time-on-wing programme, raising the figure from ...

This has been discussed before on Ars, such as at https://arstechnica.com/civis/threa...ost-efficient-heat-pump-in-the-world.1501605/, and https://arstechnica.com ...