I'm still contemplating installing a water spray for use during high power climb-out. I used Ed's cooling spread sheet and estimated I need about 200 Btu/minute additional oil cooling during climb..  I also calculated that 5 qts of oil need about 288 Btu to gain 40 deg. F during the first 2 minutes of take-off and climb  This translates to about 150 Btu/ minute.  I believe I need about 200 Btu/minute additional cooling to keep my oil cool on a 100 + deg. day.
The Latent Heat of Evaporation for water is 970 Btu/# or 8050 Btu/gal.  For a 10 minute climb I'd need 200 Btu X 10 or 2000 Btu.  This is approximately  1 Qt or 32 oz/10 minutes.  My water flow rate would than be 3.2 oz/minute.

I found some "misting" spray nozzles at Home Depot and found they work well at 30 psi.  I have a 12 V Schure RV water pump that can be used for initial testing.

Next week the afternoon temperatures will be above 100 deg again.  I hope to get the water mister installed so I can try it.

If the medical water pumps David Leonard has will provide 30 psi or more I'd be interested in trying them.

Dennis Haverlah