I was watching this video summarizing Elon Musk's recent remarks on the orbital test flight, and they mention specific engines. But unless a named engine shuts down and is shown on the small display in the SpaceX feed replay, I don't know where a specific engine is.
If you watch SpaceX's live stream of the Integrated Flight Test, you will notice that they helpfully painted the engine numbers onto the inside of the engine bells of all of the engines:
You can see that the engines are numbered in concentric rings, clockwise, always starting in the same corner:
- The inner circle of three Raptor Center engines is numbered E1–E3.
- The middle ring of ten Raptor Center engines is numbered E4–E13.
- The outer ring of twenty Raptor Boost engines is numbered E14–E33.
Unfortunately, it is not possible to see on that shot what the orientation of the camera is. If I had to guess, engines E1, E4, and E14 are directly on the Z-axis of the vehicle, i.e. perfectly leeward (facing the tower) or perfectly windward (opposite the tower).
Engines E17–E20, which had their shielding blown off at T+20s, are in the top left corner of the frame. Engine E6, which lost communication to the vehicle is also in that same corner.