Oil temp is a bit higher than I would like.  Its not clear to me whether these temps are during or right after the climb or during cruise.  I presume they are a result of climb conditions and that cruise temps are lesser? Your coolant temps sound fine to me under those conditions if that's the temp during climb - if during cruise then I think its a bit high.

Did you by any chance attempt to divide your plenum vertically to provide more air for the oil cooler?

Ed


----- Original Message ----- From: "Dennis Haverlah" <clouduster@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 15, 2007 11:35 PM
Subject: [FlyRotary] RV-7A cooling

I've made more progress toward good cooling but have a long way to go. At an OAT of 92 F I was able to climb to 5500 feet and cruse at 23 inches MP. Water was 195 F and Oil went up to 209 - 210 F.
Oil pressure was 60 psi.  I noticed my oil pressure went down to about 58 psi as the oil pressure approached 210.  This was after about 20 minutes of flight.  Is this an indication of oil foaming?  Also, is this too low oil pressure at 5500 rpm?

Now for the question:  I want to measure (in flight) air pressure to determine if my outlet is maybe too small.  Any suggestions as to what I should be measuring?  Static pressure near the outlet in the cowl vs. ambient static pressure ? That is my first guess.  Any other ideas??

Thanks,

Dennis H.

PS - Pictures of my newest inlet design coming soon.

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