When it comes to designing or building a new engine, it's imperative that a suitable compression ratio is chosen. High compression ratios maximise efficiency and power output but also increase the ...

Does “the world’s first production-ready variable compression ratio engine” mean anything to you? For general automotive consumers, perhaps not a thing – at least, not yet. But that’s ...

Every engine has a specific compression ratio. The air-fuel mixture is compressed in the cylinder to create an ignition, the force of which depends on the compression ratio: the volume of the ...

The compression ratio isn’t just a number: it’s one of the greatest determining factors in engine building. Compression ratio determines the type of fuel, how much boost, and has a significant ...

The next-generation Infiniti QX50 crossover will be powered by a turbocharged four-cylinder engine introducing a technology never seen before in a regular production vehicle: variable compression.

The compression ratio describes the volume of an engine cylinder when the piston is at the top versus the bottom of its travel.

Other than the fact it can adjust its compression ratio between 8:1 for high performance and 14:1 for maximum efficiency, the Infiniti VC-T can adjust its displacement.

Nissan varies the compression ratio between 8.0:1, a fairly low number—though typical for a turbocharged engine—and up to 14.0:1, very high for any engine, let alone one with boost.

Now Porsche is working on just such an engine, revealed in the form of a newly-published patent, which will be able to alter its compression ratio.

Here's what they've come up with: The gasoline-powered, four-cylinder MCE-5 VCRi (for Intelligent Variable Compression Ratio) engine uses a two-state turbocharger, displaces 1.5L and pumps out an ...