Hello gmtegear,It's up to you on how keen you are to validate injector failure as the root cause... Based on what i had read in a post by Jim, he had a locked injector which caused engine damage, it seemed that the injector was locked wide open and flooded the cylinder to an extent which caused hydrolock. The theory has been that dirt or debris escaped past the fuel filter and blocked the injector so that it was locked open, hence the term "injector lock". Others here have mentioned that the fuel filters can break down and possibly the cause of the debris.
IMO a partially leaking injector wouldn't seem to be enough to cause hydrolock. Engine damage by hydrolock generally requires a fairly significant amount of fluid (incompressible) and cannot escape through the valves which then causes something to bend. Seems like your bent rod is fairly conclusive as to actual hydrolock.
Now what was the fluid? It could have been coolant, gas, or just water like driving through deep water or starting the car when that cylinder was flooded with water. If the latter, you'd see no evidence of any steam cleaning as it was on a cold engine and that cylinder was first to be in the compression stroke. Lots of people try to start up cars that have been in a flood. That's why flooded cars at auction go for CHEAP.
Perhaps the car was totaled due to a flood, and that's why the engine was pulled.
All good information and theories. I am on "hold" for engine #2 disassembly, but believe if I pull rod#9 it will be also be bent, and this engine shows signs of "steam cleaning piston" aka water in bore.
I may get injectors tested or "self test" for wide open. My thoughts on partial injector stinking would also an injector to "leak down" after engine shut-off and fuel pressure still on rail. Don't know if that would be enough volume of fuel to actually hydro-lock engine, but a theory at 12:1 compression.
The comment on possible debris getting by the fuel filter also gives credit to failure on bank 2 as noted by ticat928 as fuel rail feeds directly to #8 fuel injector! Injectors #7 & #6 are "dead headed" and fuel move along the rail to #9, #10, then #'s 5-1, dead headed at #1.
Pics below again for direct compare: 1st pic is engine #1, cylinder #8, 2nd pic is engine #2, cylinder #9
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