Big End Oil Groove

[Ian Williams]

Fascinating discussion. All I can add is that we have no evidence of oil holes causing big end failure in the 300 odd thousand sevens Austin built, and that I have run a splash fed crank at high rpm for many years with no holes! As R said seem there are two schools of thought and both appear to work, so unless someone wants to set a number of engines up on a test bed and run them to destruction it appears somewhat academic. However I think we would all agree that running a full width a groove is illustrated in the OP is probably not a good idea.