Modelling engine wear and WEP limitations

[Seadog]

Originally Posted by VO101_Tom

I After 50 hour test, this Hurri have cylinder head cooling leak. But you don't know, after how much time got damage. .

The early Merlin engines were prone to cylinder head leaks, as per the memo, and this had little or nothing to do with 12lb boost. WW2 combat engines had a short service life, by civil aviation standards, and, as I have pointed out most aircraft and engines never survived past 100 hours.

Originally Posted by VO101_Tom

Yeah I forgot this According to you, what was the purpose that the oil filter was taken out (without an oil change)? What did they make with it? It was thrown in into a big green box, on which was a huge "not interest " stencil?

They would examine the filter for evidence of metal filings which typically indicated bearing damage. No metal = no need for further investigation. Obviuosly the engine flown for 49.5 hours with repeated cycling of 12 and 4.5lb boost never showed evidence of bearing damage, or they would have stopped the trial.