Re: COZY: Oil Separator
I don’t think there is much chance of data supporting it. Those who object to sump return are in the main concerned with the return of acids to the sump. In principle, I suppose that acid vapours may be cooled and condense and be returned in some circumstances. I think it unlikely to be a significant issue, given that aircraft engines usually spend long periods with the oil more than hot enough to evaporate acids from blow-by - at worst, it will take a little longer.toggle quoted messageShow quoted text
Crankcase ventilation in piston engined aircraft is generally, well, if not antiquated, certainly old fashioned. A modern crankcase ventilation system, deliberately introducing filtered air into the crankcase and ventilating by a combined PCV valve/oil separator, returning the residue to the sump is vastly superior in reducing acid in the oil - even if vented into the induction system instead of directly overboard. The PCV/Separator in suitable sizes can be obtained as a BMW spare part for their larger petrol engines. Whistle slots and slits in case of icing still need consideration.
On 16 Jun 2021, at 08:22, Marc J. Zeitlin <marc_zeitlin@...> wrote: