What are the differences between the high-power and low-power versions of the Volkswagen EA888 engine?

[VonWalter]

The main differences between the high-power and low-power versions of the EA888 engine are as follows: (1) Different combustion systems: In the third-generation low-power version of the EA888, Volkswagen adopted a different combustion system from the high-power version to optimize fuel consumption. The high-power EA888 uses the traditional Otto cycle, while the low-power EA888 employs the Miller cycle to reduce fuel consumption. As a result, components such as the pistons, cylinder head combustion chamber, cylinder head air passages, and fuel injectors differ between the two versions. (2) Significant difference in compression ratio: Due to the use of the Miller cycle, the low-power EA888 has a higher compression ratio of 11.7, whereas the high-power EA888, which uses the traditional Otto cycle, has a compression ratio of only 9.8.