What are the differences between the second and third generation of EA888?
1 Answers
There are the following differences between the second and third generation of EA888: 1. Exhaust manifold: The third-generation EA888 engine made a significant change by integrating the exhaust manifold directly into the cylinder head. Due to the extremely high working temperature and more complex structure of the exhaust manifold, this poses a significant challenge to the stability of the cylinder head. To address this, the cooling system in the cylinder head has been improved, with higher flow rates ensuring efficient heat dissipation (otherwise, the coolant in this area could even risk boiling). The second generation does not have this feature. 2. Wastegate and blow-off valve: The third-generation EA888 engine is also the first in Volkswagen/Audi engines to adopt electric wastegate and blow-off valves. This allows for precise control over the timing and degree of opening of the wastegate/blow-off valve, improving overall engine efficiency on one hand, and actively opening the wastegate to rapidly heat the catalytic converter, reducing cold-start emissions. Additionally, this is the first time the oxygen sensor has been placed on the turbocharger. The second generation does not use electric wastegate and blow-off valves.