---------------------------------------------------------- RV9-List Digest Archive --- Total Messages Posted Fri 01/30/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:05 AM - Re: Oil temp (Wayne) 2. 02:54 PM - Re: Oil temp (Wayne) ________________________________ Message 1 _____________________________________ Time: 08:05:01 AM PST US From: "Wayne" Subject: Re: RV9-List: Oil temp ----- Original Message ----- From: "Perry Yaremchuk" Sent: Thursday, January 29, 2009 12:04 AM Subject: Re: RV9-List: Oil temp > > Gee, never know when or how these list things pop up. > I have a 9a with about 260 hrs on a low compression 0-320. with the > cooler - mounted at the top rear of the plenum horizontally, last time > I did circuits it was about 50 F out and with the cooler fully blocked > at the rear, saw only about 160 - 165 F also. It never broke 200 in > the summer on a hot day, WOT climb to 5000'. > I also might suspect the instrumentation, but have just been looking > at adding a spin-on filter adapter, and noticed that some have a > built-in vernatherm, some don't, some rely on a bypass in the > filter.......in other words, you might have an open 'circuit' that is > running oil thru the filter, cooler and hoses, which provides a fair > bit of cooling area. Just confirmed Superior installed a 85 degreeC vernatherm in my filter adapter. Bill at superior also suggested I add insulation to the SS braid covered teflon lines I have feeding the firewall mounted cooler. > My limited experience operating is of little help, but in reading up > on it, the oil level will contribute to cool temps if you run over 5 > or 6 quarts in the sump. If your carb is jetted quite rich, there's > another source of cooling....fuel. How agressively do you lean? sounds > like you have pretty good instrumentation, once you verify it is > accurate! > I like the sound of the obvious gain in efficiency by reducing your > outlet....how did you do this? > duct tape ? :-)....or something more permanent? If the wind dies down looks like I can get in another flight this afternoon .. I mated (with piano hinge)a piece of 7075 .028 T6 aluminum sheet curved to fit the outlet and extending back about 8 inches. It is tapered so the air can reacellerate smothly. > > best of luck with your temps.....consider yourself thankful you're not > battling high temps instead! Yup > > Perry > > On Wed, Jan 28, 2009 at 7:47 PM, cam andres > wrote: >> Wayne, >> Have you verified the temperature indicating components are accurate? I >> would make sure that a bench test confirms their accuracy before going to >> the next step. >> Cam Andres >> RV9A under construction >> >> On Wed, Jan 28, 2009 at 3:14 PM, Wayne wrote: >>> >>> With about 9 hours on my 9A I cant get the oil any hotter than 170 F >>> and >>> to do that I have to block off all the air flow to the cooler. I am >>> about to >>> try insulating the oil lines. >>> I tried necking down the outlet air under the cowl . It started as >>> about >>> 110 percent of the inlet area size and is now 92 percent . The >>> preliminary >>> result is slightly cooler CHTs and EGTs and it goes 7 kts faster. More >>> testing is required when the weather breaks. The goal of warming the oil >>> more did not happen. >>> >>> Any suggestions? >>> Wayne >>> >>> et="_blank">http://www.matronics.com/Navigator?RV9-List >>> ttp://forums.matronics.com >>> _blank">http://www.matronics.com/contribution >> >> >> > > > ________________________________ Message 2 _____________________________________ Time: 02:54:31 PM PST US From: "Wayne" Subject: Re: RV9-List: Oil temp I knew it was too good to be true. On a .longer flight at 5500 feet there was no difference in airspeed. Also insulating the oil lines did not help I could only get 155 degree oil with OAT of 35 degrees and half the cooler inlet plugged. The best so far is all the oil cooler blocked. Oil was 173 and OAT of 49 for a delta t of 124. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv9-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV9-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv9-list Browse Digests http://www.matronics.com/digest/rv9-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.