In this engine, the compression ratio was reduced to 17.4:1 with high pressure and multiple diesel injections. The multiple injections consist of pilot injection and the main injection, in order to shorten the ignition delay, reduce the noise, and  emission.
The compression ratio in this engine was set at 17.4:1 with high-pressure diesel injections, including both a pilot injection and the main injection. These multiple injections are intended to reduce ignition delays, decrease noise levels, and minimize emissions.