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Oil temp

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wowens(at)darientel.net
Guest

Posted: Wed Jan 28, 2009 2:34 pm Post 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

   [quote][b]

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cameronandres(at)gmail.co
Guest

Posted: Wed Jan 28, 2009 8:02 pm Post subject: Oil temp

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(at)darientel.net (wowens(at)darientel.net)> wrote:

 [quote]  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

 	  Quote: 	
		  



et="_blank">http://www.matronics.com/Navigator?RV9-List

ttp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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payaremchuk(at)gmail.com
Guest

Posted: Wed Jan 28, 2009 9:17 pm Post subject: 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.

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(at)gmail.com> wrote:

 	  Quote: 	
		   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(at)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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wowens(at)darientel.net
Guest

Posted: Thu Jan 29, 2009 2:48 pm Post subject: Oil temp

Yes  I attached a Fluke thermocouple  meter next to the thermistor and heated them with a heat gun. It read the same  on the meter and the Advanced Fight EFIS within 10 degrees.

 Thanks for the suggestion.

 Wayne

 [quote]   ---

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wowens(at)darientel.net
Guest

Posted: Fri Jan 30, 2009 8:04 am Post subject: Oil temp

---

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wowens(at)darientel.net
Guest

Posted: Fri Jan 30, 2009 2:54 pm Post subject: 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.

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