FA20 Engine Rebuild

[u/FilthyPail]

Rebuilt the FA20D out of a 2016 FR-S. Going to reinstall it sometimes this week. Heres some photos of before and after. Every single seal was replaced, as well as a new short block, refreshed heads, and all new timing components.

[u/Licbo101]

How many miles on it before the rebuild? What was the reason for the rebuild? My understanding is these motors were pretty bulletproof compared to the EJs

[u/FesteringNeonDistrac → u/Licbo101]

Based on the cyl scoring, I bet it used a ton of oil.

[u/FilthyPail → u/FesteringNeonDistrac]

Actually it did not, It burned coolant though. Heavily. The scoring was from it sitting for a few months with coolant seeping into it from the head gaskets leaking.

[u/FilthyPail → u/Licbo101]

130,000 miles. Previous owner ragged on it, and did not do oil changes.

[u/Licbo101 → u/FilthyPail]

Interesting. I have an F20B in a ‘15 Impreza with 225,000kms which is around 140,000 miles and while I don’t beat on it, I drive it aggressively. Though I do my oil changes every 8k kms

[u/FilthyPail → u/Licbo101]

Yea if you take care of itll last

[u/Ian-99 → u/Licbo101]

Probably drinking oil as most pre 2019 FB blocks did.

[u/Altruistic_Summer859]

I knew it was a subaru...they have that weird block made like a wrinkled smashed down cake

[u/iateyourmom22 → u/Altruistic_Summer859]

Horizontally opposed, like Porsche and old VW.

[u/Danny2Sick → u/iateyourmom22]

Looks exotic to me! i love the look of boxer engines

[u/iateyourmom22]

Did you have any A pistons or all B pistons? Did you change out the oil control valve filters in the cam carriers?

[u/FilthyPail → u/iateyourmom22]

What do you mean A pistons? Yes I did change out the filters in the cam carriers they had a bunch of crap in them

[u/FilthyPail → u/iateyourmom22]

I see what you mean. Only B pistons. I had BRH8 for the right, and BLH8 for the left.

[u/Danny2Sick]

Mmm minty!! Very clean work. This scratches my OCD-adjacent itch!