Goc3k
Well-Known Member
The pressure drop effect separates the oil from the air rather than the oil condensing as it hits the IC. The oil vapour starts to condense immediately after it is forced out of the combustion chamber and into the crankcase (via blowby, oil passing from the turbo will condense as soon as it hits the compressor housing, or blow straight out the exhaust via the turbine seal), even before reaching the intake plumbing (massive temp drop, like when you breathe out on a frosty morning and the water in your breath condenses near instantly) , as such - oil vapour than drops out and becomes trapped in the intake system / starts to pool will never be picked back up by the intake charge again, as the temperature within the intake cannot get high enough to vaporize the collected oil residue (temperature in the IC is less than 200C-250C all the time). There is a degree of evaporation that occurs of course, and that is what stops the system on a healthy engine eventually filling with oily residue. (passage of "leaked" oil is less than the rate of evaporation)
Hence checking for pooling (or the lack of) is a good test - if anything it would be nice to see some pooling as that might help the diagnosis become more concrete
Hence checking for pooling (or the lack of) is a good test - if anything it would be nice to see some pooling as that might help the diagnosis become more concrete