Here's the one housing that got re-used after the failure. Although its been cleaned up in this pic, you can still see a bit of the marks/swelling thats happened to it.
same housing, different view showing the waterjacket mods I did (bulb head dremel on a drill press and lots of time
)
Heres the housing that contained the blast
It is untouched, exactly as it came out of the engine.
We see the typical sort of marks but nothing drastic, neither housing has any cracking in the boss area at least.
Barry do these look typical for an engine that lived on the highway, and @20psi all its life?
As for the weird little "hotspot" staining that shows up all around the area, I have to mention that these housings had alot of those on them before I used them. They were very nice condition housings from a j-spec that was FULL of carbon, and low compression because of it. But the housings had funny stains all over the plae inside the (I presume) from lack of apex seals sealing against the housing due them being stuck in the rotor slots with carbon.
Most of that has gone away (95%) but what remains now is only at the spark boss area. They can't be felt, but they are visible.
BTW engine is back together, and the car runs well. Seems to really like the S4 rotors
Low comp might give me a little more flexibility.