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What's interesting about this issue, is the fact that many seals apparently did survive when people doubled the output by going FI (which is only possible with more pressure and with it temperature in the combustion chamber).
Maybe it's simply a manufacturing clearance/fitting issue (the tolerances given to the manufacturer(s) of the seals are not tight enough or the dimensions from seal to seal vary too much in the manufacturing process).
Some seals simply have a looser fitting and those seals are now showing problems, since they can transmit less heat and can move more easily.
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