RV9-List Digest Archive

Wed 01/28/09


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 02:34 PM - Oil temp (Wayne)
     2. 08:02 PM - Re: Oil temp (cam andres)
     3. 09:18 PM - Re: Oil temp (Perry Yaremchuk)
 
 
 


Message 1


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    Time: 02:34:33 PM PST US
    From: "Wayne" <wowens@darientel.net>
    Subject: Oil temp
    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


    Message 2


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    Time: 08:02:48 PM PST US
    Subject: Re: Oil temp
    From: cam andres <cameronandres@gmail.com>
    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 <wowens@darientel.net> 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 > > * > > * > >


    Message 3


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    Time: 09:18:00 PM PST US
    Subject: Re: Oil temp
    From: Perry Yaremchuk <payaremchuk@gmail.com>
    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. 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? best of luck with your temps.....consider yourself thankful you're not battling high temps instead! Perry On Wed, Jan 28, 2009 at 7:47 PM, cam andres <cameronandres@gmail.com> 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 <wowens@darientel.net> 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 > >




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