no detonation the piston are in good condition they are very flat on the surface only that number 1 and 4 are more dirty also on the cylinder head in the combustion chamber.. (didn't no that the standard piston are MAHLE )

BUT CARFULL WANT I FOUND KNOW LOOK GOOD ON THE FIRST PICTURE YOU CAN SEE LITTLE BIT THAT THE PISTON 4 IS LOWER THEN THE NUMBER 1
HER IS THE ANSWER
whats wrong in this picture?

yes very lucky that I open again the engine only 1600 miles ago
lucky that I didn't broke ( I directly bought some H conrods )


I think it s from to mutch boost 17psi on old standard conrods

also one bearing is in bad condition only 2 from one conrod


all the other looks more normal


my crankshaft it s OK