The engine promised aerodynamic efficiency, a higher bypass ratio, and a better engine pressure ratio while also being built from advanced, lighter, yet more impact-resistant materials.

We will use 10 psi because it is nearing the threshold of safety for a nonintercooled pump gas engine. The pressure ratio for a 302-inch engine at 6,000 rpm is 1.68.

During this stage, as the air is squeezed, the air-pressure ratio can reach 40-to-1 while air temperatures rise several hundred degrees.

Calculating the pressure ratio: You'll need to know your desired pressure ratio—or how much boost you want to run—before that compressor map will mean anything to you.

Although details are thin on the ground right now, Infiniti says that the VC-T engine can alter its compression ratio from as low as 8:1 (for high performance) to as high as 14:1 (for efficiency).

Infiniti is putting the pressure on its competitors. The automaker has revealed plans to introduce the first production-ready engine with a variable compression ratio that promises to improve ...

The GENX goal is less than 4 litres/1,000kg (1USgal/450lb) of NOx at an overall engine-pressure ratio of about 47:1.

With compound turbocharging, you step up the air pressure a reasonable amount (say, pressure ratio of 1.5 to 2.0) with the Stage 1 turbocharger, then intercool it.