What are the differences between the first and second generation of EA888?
2 Answers
The difference between the first and second generation of the EA888 diesel engine lies in the oil-gas separator equipment. Below are the relevant details: 1. Different locations of the engine oil filler port: The engine oil filler port location differs; the first-generation engine has it in the middle left position, while the second-generation has it towards the rear left. 2. Engine cover: The engine cover of the second-generation car is black, whereas the first-generation's is not black. 3. Changes in the second generation: Key improvements in the second generation include: the engine block being 0.5mm thinner for lighter weight, some modifications to the water channels, the tensioner changed to a spiral structure, the timing belt reduced from 5 to 4 pieces, the oil-gas separator equipment changed to a built-in type, and the crankshaft balance blocks reduced from 8 to 4.
I've previously studied Volkswagen's EA888 engine, and the differences between the first and second generations are quite significant. The first generation, used in older models like the Golf or Passat, had design flaws in the timing chain that caused frequent issues. Chain stretching could lead to skipped teeth or even engine damage, which ruined quite a few cars. After improvements in 2012, the second generation featured a more durable timing chain material, significantly enhancing longevity, along with a more robust hydraulic tensioner. The turbocharger was also upgraded—the first generation used a single-scroll design, which suffered from slow response at low RPMs and noticeable turbo lag. The second generation switched to an integrated exhaust manifold turbo, where exhaust heat directly warms the coolant, improving warm-up efficiency and acceleration response. The fuel injection system was changed from port injection to direct injection. While the first generation was prone to carbon buildup clogging the injectors, the second generation reduced this issue but required additives during maintenance. The exhaust system and combustion chamber structure were optimized, slightly improving fuel economy. Overall, the second generation marked a substantial leap in both reliability and performance, representing Volkswagen's key response to customer complaints.
