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Lynn,
Thanks for all the oil pump, inlet tube etc. information. My engine is a stock RX-8 engine pulled out of a wreck with about 9500 miles. The pan and oil pick-up are stock with a 1/2 inch spacer on the oil pick-up. The crankshaft oil bypass has been disabled and the oil pick-up is the stock plastic item. From the information you sent it appears I could really improve my oil pick-up system! On start-up my oil goes to 85 psi. After warm-up it is slightly slower. On take-off it goes to 85 but as the oil temp exceeds 200 the oil pressure comes down some. I will open the filter and check it when I change to Redline straight 40 W racing oil. I compared the oil dip stick from a 1997 13 B and the Renesis. It looks like the oil level in the Renesis is about 1 1/2 inch lower in the Renesis.
Ed, I took the water thermostat out and plugged the bypass hole. I will try a diverter dam in the intake to channel more air to the oil and less to the water coolers.
Dennis H.
Ed Anderson wrote:
Hi Dennis,
My oil pressure will tend to drop when the oil gets to 200F by about the same amount 5-7 psi. I don't believe this is caused by foaming but by temperatures. This is fairly normal when your oil gets hot. At cruise my oil pressure runs at 65-70 psi with the stock pressure regulator and oil temps around 165-180F. I forgot to ask(and can't remember) are you using a thermostat or not?
If you are using a thermostat then your coolant temps are what I would expect in Cruise, but your oil is still higher than I would feel comfortable with for long duration. If you were just seeing that on take off then I'd say fairly normal, but the oil temps should come down in cruise at least to the 180F region (in my opinion).
Ed
----- Original Message ----- From: "Dennis Haverlah" <clouduster@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 16, 2007 10:06 AM
Subject: [FlyRotary] Re: RV-7A cooling
Ed,
The temperatures were in cruise. I modified my lower inlet duct to provide a deeper wedge under the oil cooler and a tighter wedge under the water cooler. I'll post a couple of picutres today. Is the oil pressure OK compared to your experience?
Dennis H.
Ed Anderson wrote:
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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