Engine damage

Bad start this year. 

The fuel surge on last trackday caused more damage than I initially thought.

Damaged spark plugs. These are from cylinder #2, #3 and #4

A compression gave the figures 14.5, 12.5, 12.0, 13.5 bar and they're supposed to be within 10%. Some oil in the bad cylinders increased the compression quite a lot. According to Google that puts the suspicion to damaged piston rings. I also see a little bit of smoke from the breather.

I had to take the engine apart.

The pistons are damaged, and so is the block. I put the block into the trunk of the daily driver and asked around among professionals and the verdict is that three pistons are gone, the block can be saved but it would be easier and cheaper to simply buy a new one. Fortunately the head and the rods are not damaged at all.

Damaged block and #3 piston

Damaged piston

I found a good document about piston damage.

Except that, all bearings and everything else looks as new.

The people I've asked about the engine agrees with my theory of what happened - the alternator stopped charging, and when the battery discharged during the day the fuel pump could not keep up on the long Mantorp straight and the engine run lean.