Here’s a look at the Subaru FA20D engine and how it works! The engine was also known as the Toyota 4U-GSE. These engines were used in the Toyota 86, Scion FRS and Subaru BRZ.

The FA20 engine was a modernized boxer series from Subaru that now used a timing chain instead of a belt and dual overhead camshaft with variable valve timing. Specifically, the FA20D had Toyota's D4S dual injection system, featuring both port and direct injection, which allows for a more controlled combustion for more power and less pollution.

Early FA20 engines, suffered from burning oil, which would eventually run the engine out of oil and cause catastrophic engine damage, like the one in this video. Valve springs failing were also another common issue.

Overall, the FA20 marks a progression forward for Subaru, with it now being currently its main engine in its line up of vehicles, with 2.0L and 2.4L variants, both naturally aspirated and turbocharged. It has replaced the ancient H6 boxer engines as well as the antiquated EJ series.

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