I was thinking of contamination from sleeve issues causing an octane drop and then detonation but I have no experience with E85.SWR wrote:They had issues with badly machined sleeve bores, so the engine has dropped the sleeves 3 times already, even if the block was heated a fair bit and left overnight to cool slowly with the sleeves under a fair bit of pressure the second time. So I guess that sleeve drop happened at the "same" time, i.e. when the engine was loaded in the higher gears they sunk again. I did not do any machine work on this engine so I really have no idea exactly how they did it, I just was told it was a botch job the first time, and they tried rectifying it after. But the block had sunken liners when they brought it to me now..
The fact that the rods weren't bent amidst all of this is interesting, and the lack of melted pistons, a bunch of 'sharp' detonations near TDC could fit.