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Louvers

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rveighta(at)comcast.net
Guest

Posted: Wed Sep 16, 2009 4:52 pm Post subject: Louvers

I guess I started the latest thread on louvers, so let me throw my two cents in: I installed them on my 8A after experiencing  

high oil temps. Prior to the louvers, I was running 225 or so on a hot day. Now, I rarely see in excess of 190. So, then I built 

an RV8 and having similar temperature issues, I installed a pair of louvers in it as well.  Same results, oil temps went down 

dramatically. The only problem with both the planes was getting the oil temps HIGH enough in winter (I solved that by making 

blanks to install between the inside of the cowl and the louvers). 

  

So, I can only say what worked for me. Maybe louvers won't work for you. 

  

Walt



 [quote][b]

tracy(at)rotaryaviation.c
Guest

Posted: Wed Sep 16, 2009 5:17 pm Post subject: Louvers

Excellent!  Direct before & after results with all else being the same is the best kind of data.



I'd be interested in exactly where you mounted the louvers.  I've been assuming that on an RV-8 they would go on either side of the cooling duct 'trough' on the lower cowl.  Is that where you put them?  I'm assuming you used a pair of the Avery type louvers?

 

I'll be happy to deal with the low temperatures in winter.



Tracy Crook



On Wed, Sep 16, 2009 at 8:51 PM,  <rveighta(at)comcast.net (rveighta(at)comcast.net)> wrote:

 [quote]

I guess I started the latest thread on louvers, so let me throw my two cents in: I installed them on my 8A after experiencing   

high oil temps. Prior to the louvers, I was running 225 or so on a hot day. Now, I rarely see in excess of 190. So, then I built 

an RV8 and having similar temperature issues, I installed a pair of louvers in it as well.  Same results, oil temps went down 

dramatically. The only problem with both the planes was getting the oil temps HIGH enough in winter (I solved that by making 

blanks to install between the inside of the cowl and the louvers). 

  

So, I can only say what worked for me. Maybe louvers won't work for you. 

  

Walt



  	  Quote: 	
		  



3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D



	


[b]

ceengland(at)bellsouth.ne
Guest

Posted: Wed Sep 16, 2009 5:50 pm Post subject: Louvers

Tracy,



Have you seen the stuff on the CAFE web site?

http://cafefoundation.org/v2/main_home.php

Click the 'research' tab, then 'cafe reports', then 'local flow I, II, & 

III.



II discusses louvers & 'bluff bodies'.



Charlie

Tracy Crook wrote:

 	  Quote: 	
		   Excellent!  Direct before & after results with all else being the same 

 is the best kind of data.



 I'd be interested in exactly where you mounted the louvers.  I've been 

 assuming that on an RV-8 they would go on either side of the cooling 

 duct 'trough' on the lower cowl.  Is that where you put them?  I'm 

 assuming you used a pair of the Avery type louvers?



 I'll be happy to deal with the low temperatures in winter.



 Tracy Crook



 On Wed, Sep 16, 2009 at 8:51 PM, <rveighta(at)comcast.net 

 <mailto:rveighta(at)comcast.net>> wrote:



     I guess I started the latest thread on louvers, so let me throw my

     two cents in: I installed them on my 8A after experiencing



     high oil temps. Prior to the louvers, I was running 225 or so on a

     hot day. Now, I rarely see in excess of 190. So, then I built



     an RV8 and having similar temperature issues, I installed a pair

     of louvers in it as well.  Same results, oil temps went down



     dramatically. The only problem with both the planes was getting

     the oil temps HIGH enough in winter (I solved that by making



     blanks to install between the inside of the cowl and the louvers).



      



     So, I can only say what worked for me. Maybe louvers won't work

     for you.



      



     Walt

rveighta(at)comcast.net
Guest

Posted: Thu Sep 17, 2009 3:55 am Post subject: Louvers

gyoung

Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas

Posted: Thu Sep 17, 2009 10:24 am Post subject: Louvers

The sides might be better. I heard a report (I think it was an  RV-10) that had bottom mounted louvers that did not help much but moving to the  side did. The theory was that high AOA on climb pressurized the bottom of the  cowling preventing the louvers from being as effective as they were in level  flight. Something to consider.

  

 Regards,

Greg Young

  



 [quote]         From: owner-rv-list-server(at)matronics.com    [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Tracy    Crook

Sent: Wednesday, September 16, 2009 8:17 PM

To:    rv-list(at)matronics.com

Subject: Re: RV-List:    Louvers

   

Excellent!  Direct before & after results with all else    being the same is the best kind of data.



I'd be interested in exactly    where you mounted the louvers.  I've been assuming that on an RV-8 they    would go on either side of the cooling duct 'trough' on the lower cowl.     Is that where you put them?  I'm assuming you used a pair of the Avery    type louvers?



I'll be happy to deal with the low temperatures in    winter.



Tracy Crook



   On Wed, Sep 16, 2009 at 8:51 PM, <rveighta(at)comcast.net (rveighta(at)comcast.net)>    wrote:

    	  Quote: 	
		                 

I guess I started the latest thread on louvers, so let me throw my two      cents in: I installed them on my 8A after experiencing      

high oil temps. Prior to the louvers, I was running 225 or so on a hot      day. Now, I rarely see in excess of 190. So, then I built     

an RV8 and having similar temperature issues, I installed a pair of      louvers in it as well.  Same results, oil temps went down     

dramatically. The only problem with both the planes was getting the oil      temps HIGH enough in winter (I solved that by making     

blanks to install between the inside of the cowl and the louvers).     

      

So, I can only say what worked for me. Maybe louvers won't work for      you.     

      

Walt



 	  Quote: 	
		  

	


	


[b]

johnd(at)wlcwyo.com
Guest

Posted: Thu Sep 17, 2009 11:23 am Post subject: Louvers

I had a problem with higher oil temps back in 2002.

I installed vortex generators at the aft end of the cowl opening.

This did wonders for my oil temp. and have never had any problems since.

John Danielson



--

Tailgummer(at)aol.com
Guest

Posted: Thu Sep 17, 2009 12:23 pm Post subject: Louvers

Ingenious, John!  Did these have any effect on your CHT's?

                                                                                          John D'Onofrio

  [quote][b]

tracy(at)rotaryaviation.c
Guest

Posted: Thu Sep 17, 2009 12:57 pm Post subject: Louvers

I thought the higher pressure on bottom of cowl might be a problem as well.  Latest test would seem to verify that.  I keep changing my mind about what to try first and settled on hinging the -8 cooling exit ramp on the bottom cowl and make it a movable cowl flap.  I cut the ramp out starting about 15 inches in front of the aft edge.   Before doing the movable flap I did a test flight with the big gaping hole  (about 13 X 15") in the bottom cowl just to see what would happen.  It ran about 15 degrees cooler than the stock cowl opening but nothing like the 60 deg. drop I got with the cowl off.  

 

Checked out the CAFE data that Charlie suggested and have a few ideas from there I want to try as well.



Tracy



On Thu, Sep 17, 2009 at 2:23 PM, Greg Young <gyoung(at)cs-sol.com (gyoung(at)cs-sol.com)> wrote:

 [quote]     The sides might be better. I heard a report (I think it was an  RV-10) that had bottom mounted louvers that did not help much but moving to the  side did. The theory was that high AOA on climb pressurized the bottom of the  cowling preventing the louvers from being as effective as they were in level  flight. Something to consider.

  

 Regards,

Greg Young

  



  	  Quote: 	
		           From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)    [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)] On Behalf Of Tracy    Crook

Sent: Wednesday, September 16, 2009 8:17 PM

To:    rv-list(at)matronics.com (rv-list(at)matronics.com)

Subject: Re: RV-List:    Louvers

   

Excellent!  Direct before & after results with all else    being the same is the best kind of data.



I'd be interested in exactly    where you mounted the louvers.  I've been assuming that on an RV-8 they    would go on either side of the cooling duct 'trough' on the lower cowl.     Is that where you put them?  I'm assuming you used a pair of the Avery    type louvers?



I'll be happy to deal with the low temperatures in    winter.



Tracy Crook



   

On Wed, Sep 16, 2009 at 8:51 PM, <rveighta(at)comcast.net (rveighta(at)comcast.net)>    wrote:

    	  Quote: 	
		                 

I guess I started the latest thread on louvers, so let me throw my two      cents in: I installed them on my 8A after experiencing      

high oil temps. Prior to the louvers, I was running 225 or so on a hot      day. Now, I rarely see in excess of 190. So, then I built     

an RV8 and having similar temperature issues, I installed a pair of      louvers in it as well.  Same results, oil temps went down     

dramatically. The only problem with both the planes was getting the oil      temps HIGH enough in winter (I solved that by making     

blanks to install between the inside of the cowl and the louvers).     

      

So, I can only say what worked for me. Maybe louvers won't work for      you.     

      

Walt



 	  Quote: 	
		  

	


	




	
    	  Quote: 	
		  



t="_blank">http://www.matronics.com/Navigator?RV-List

tp://forums.matronics.com

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



	




[b]

Charles Heathco

Joined: 10 Jan 2006
Posts: 201

Posted: Thu Sep 17, 2009 7:59 pm Post subject: Louvers

John, could you give some details, maybe pix of those V G's? Charlie

---

johnd(at)wlcwyo.com
Guest

Posted: Fri Sep 18, 2009 12:23 pm Post subject: Louvers

As I recall, they did not have any effect on the CHT’s, but I could be wrong.  

         

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Tailgummer(at)aol.com

 Sent: Thursday, September 17, 2009 2:20 PM

 To: rv-list(at)matronics.com

 Subject: Re: Louvers  

  

     

Ingenious, John!  Did these have any effect on your CHT's?  

    

                                                                                         John D'Onofrio  

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      [quote][b]

johnd(at)wlcwyo.com
Guest

Posted: Fri Sep 18, 2009 12:42 pm Post subject: Louvers

I am sorry I don't have a photo.

All that I did was take some left over 0.020 aluminum angle and cut it about 1.25" long with an angle cut on one side.

I placed these at the aft end of the cowl (right before the exhaust) at about a 45 deg angle, about 1/2" apart at the leading edge of the vortex generators.

I only placed a total of 4 of these on the bottom of the cowl.

Looks like:

                 Aft end of cowl               

            _______________________

              \    /        \    /

               \  /          \  /



Hope this helps.



John Danielson



--

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