In the last post, the MP64 supercharger from our customer's EcoTec powered Atom was shipped to Magnuson for inspection. It turns out that the damage was significant. *Something* had been ingested into the motor, and the rotors were damaged beyond repair. This could also be the cause of the damaged ring in the engine.
They rebuilt the case with only a hone and polish, which was another lucky break. If the case was damaged badly, a new supercharger would have been needed.
The rotors are coated with a very cool APC coating - 'Abradable Powder Coating'. It's a coating that wears away on break-in to create a very complete seal between the rotors. As it is broken in to 'mesh' the parts, a dry lubricant is released to control friction. It's a smart way to make the rotors as tight as possible to create reliable boost. Here's a link if you'd like to read more.
Our next step is to get the engine back into the car and test. I'll report back.