X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.texas.rr.com ([24.93.47.41] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2106509 for flyrotary@lancaironline.net; Sat, 16 Jun 2007 12:17:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.93.47.41; envelope-from=clouduster@austin.rr.com Received: from [10.0.0.99] (cpe-70-122-12-239.austin.res.rr.com [70.122.12.239]) by ms-smtp-02.texas.rr.com (8.13.6/8.13.6) with ESMTP id l5GGGJw0020552 for ; Sat, 16 Jun 2007 11:16:19 -0500 (CDT) Message-ID: <46740CCC.7090808@austin.rr.com> Date: Sat, 16 Jun 2007 11:16:12 -0500 From: Dennis Haverlah User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: RV-7A cooling References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine 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" > > To: "Rotary motors in aircraft" > 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" >>> >>> To: "Rotary motors in aircraft" >>> 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. >>>> >>>> -- >>>> Homepage: http://www.flyrotary.com/ >>>> Archive and UnSub: >>>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >>> >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >