Assessing the Windage Tray Blockage Effect on Aeration in the Oil Sump
Aeration at the oil pump inlet was measured by X-ray absorption in a production V-6 SI engine motoring at 2000 to 6000 rpm. Within experimental uncertainty, these windage tray changes had no effect on aeration.
http://dspace.mit.edu/bitstream/handle/1721.1/38713/166145859.pdf
Then a windage tray aeration reduction study was performed. Three alternative tray designs were tested. Results showed the design changes to have no significant affect on the aeration level.

