A gasoline piston engine that can dynamically change its compression ratio —that is, the amount by which the piston squeezes the fuel-air mixture in the cylinder—has long been a holy grail of ...

Some engines use a spark to ignite their fuel, and others rely on compression. What does all of that mean? And how do the two ...

Turbodiesel engines have become more and more common over the years, and for good reason. Here's what sets them apart from ...

But diesel compression ratios on the other hand typically start at 12 and can hit 16-to-one or more. Of course ridiculously high compression is a required part of the diesel-combustion process.

Diesel compression is more than twice as high, ... is not unusual on a modern turbo diesel, so the true compression ratio might be 3.5 x higher than the mechanical ratio.

The compression ratios in diesel engines are crazy high because of it. There’s a lot of science behind it, but the key takeaway is that diesel is much harder to burn than gas.

Advantages of the system are that it provides up to 15 percent lower fuel consumption than regular engines. HCCI engines can work on diesel compression ratios, providing better efficiency than ...

That low diesel compression ratio takes us to the next step in the equation: Mazda also has some of the highest compression ratios for gasoline engines - very close to an almost-impossible 14:1 ratio.

If you're keeping track, that's the lowest diesel compression ratio in the world. Race teams in the Grand Am GX class can now get their hands on a new diesel powerplant.