bad blow by

[ginganggooly]

after trying to work out what you are saying - i need to ask:

do you realise that "blow by" is where the cylinder pressure rushes past the piston rings INTO the crank case? not the other way around?

I always had it in my mind that it was both ways... i.e. when the crank is pressurised, say from a clogged pcv valve or cactus rings, and the pressure pushes oil up past the rings into the combustion chamber- or, as per your above statement...