[MPACT]

Hello all. I had an engine fail 100mi after installing an ESS S/C on my 2011.75 M3 with 67k miles. Upon inspection, it was a failure of #1 and/or #5 rods. See pic below.

After swapping to another donor engine with 20k miles it popped again. I just bought another 25K mi donor engine but want to figure out what is going on before installing this one.

So, please any suggestions as to what may be happening would be greatly appreciated!!


Anyone seen this?


2022 Update:

Adding some context to this since I think I figured out what it was. So first engine, original at 67K miles, just let go with a standard rod bearing failure. Super bad luck but that is what it was.

After that I picked up a 20k mi donor engine and had a shop in SLC do the work. The guys there really botched that job, leaving several things wrong with the engine install and it went at 200mi post-install. Very bad news, shop refunded me all the money and took responsibility. I thought many times about selling the car, building a stroker, or just trying to decide what to do. I ended up just scrapping both engines and starting over.

I ended up buying another 25k mi donor engine, this time I went through the whole thing, changing rod bearings to coated OEM, changed all the gaskets, and then I took it to a high-end shop in UT and had it all put back together as an NA setup. I then moved to TX and had MPorium go through every detail to make sure the car was mechanically perfect. Since then I have put ~15k miles on it just to make sure it was all running fine. Changed water pumps, thermostat, throttle actuators and added all the upgrades. Ended up getting one of the last Harrop kits and being invited into the Stage 2 beta group.