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Engine cooling Louver Vents

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jeffrey-j-paris(at)excite
Guest

Posted: Fri Jul 20, 2012 10:37 am Post subject: Engine cooling Louver Vents

Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

   

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

   

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

   

  Thanks for your time and consderation.

   

  Jeff Paris

  [quote][b]

psm(at)att.net
Guest

Posted: Fri Jul 20, 2012 11:20 am Post subject: Engine cooling Louver Vents

Hi Jeff,

     

     I am not an expert, but I think a single lip on the exit point of     the cowl bottom could have the same drawing effect as louvers     positioned along the cowl bottom.

     

     Paul

     Camas, WA

     Â 

     On 7/20/2012 11:36 AM, Jeffrey J Paris       wrote:

     

     [quote]                Gentlepeople,

                Â 

                A few months ago someone out on our lists mentioned that they         were using some louvered vents in an aid to cooling their Jabiru         installation. Â I would be interested to see if anyone has some         anecdotal or actual experience with utilizing louvered vents on         the bottom of a cowl in an effort to aid and imnprove engine         cooling.

                Â 

                In my case I have a Jab3300 powered Zentith Zodiac in which I'm         pretty much dialed into in terms of cooling. Â However, I am also         a builder of a Jab 3300 powered Europa Classic Monowheel and due         to the fact Â that the footwells and the main landing gear         truncate the bottom opening of the cowl making a clean and big         enough exit a bit "messy".

                Â 

                I am curious to see if a set of vented louvers running parallel         and under each cylinder would create enough pull to enhance         cooling?Â (Bonanzas have em') Â Do the experts think I might have         some luck with just such an installation?

                Â 

                Thanks for your time and consderation.

                Â 

                Jeff Paris

        	  Quote: 	
		  

	
     [b]

plus2s

Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND

Posted: Fri Jul 20, 2012 1:22 pm Post subject: Engine cooling Louver Vents

Have a look at

http://www.jabiru.net.au/Service%20Bulletins/Engine%20files/Engine%20Cooling%20JSB016-1.pdf

We used the Medium version and head temps are now great no matter what power settings

Regards

Keith

        From: Paul Mulwitz <psm(at)att.net>

 To: jabiruengine-list(at)matronics.com 

 Sent: Saturday, 21 July 2012 7:18 AM

 Subject: Re: JabiruEngine-List: Engine cooling Louver Vents

  

 

                   Hi Jeff,

     

     I am not an expert, but I think a single lip on the exit point of     the cowl bottom could have the same drawing effect as louvers     positioned along the cowl bottom.

     

     Paul

     Camas, WA

      

     On 7/20/2012 11:36 AM, Jeffrey J Paris       wrote:

     

     [quote]                Gentlepeople,

                 

                A few months ago someone out on our lists mentioned that they         were using some louvered vents in an aid to cooling their Jabiru         installation.  I would be interested to see if anyone has some         anecdotal or actual experience with utilizing louvered vents on         the bottom of a cowl in an effort to aid and imnprove engine         cooling.

                 

                In my case I have a Jab3300 powered Zentith Zodiac in which I'm         pretty much dialed into in terms of cooling.  However, I am also         a builder of a Jab 3300 powered Europa Classic Monowheel and due         to the fact  that the footwells and the main landing gear         truncate the bottom opening of the cowl making a clean and big         enough exit a bit "messy".

                 

                I am curious to see if a set of vented louvers running parallel         and under each cylinder would create enough pull to enhance         cooling? (Bonanzas have em')  Do the experts think I might have         some luck with just such an installation?

                 

                Thanks for your time and consderation.

                 

                Jeff Paris

        	  Quote: 	
		  



	
       --> http://www.matronics.com/con================


[b]

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Sun Jul 22, 2012 4:22 pm Post subject: Engine cooling Louver Vents

Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

  --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

 

On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

[quote]  Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

    

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

    

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

    

  Thanks for your time and consderation.

   

  Jeff Paris

   	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	
[b]

carlmeek(at)gmail.com
Guest

Posted: Sun Jul 22, 2012 11:39 pm Post subject: Engine cooling Louver Vents

Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

I'm currently working on cooling my Jabiru 3300 in the Europa.



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

[quote]Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

  --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

 

On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

    

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

    

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

    

  Thanks for your time and consderation.

   

  Jeff Paris

   	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	




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[b]

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Jul 23, 2012 3:50 am Post subject: Engine cooling Louver Vents

Carl:



You are in luck.  I happen to have a set for a job I'm doing - - - I'll take pictures and post them. It will happen just a little later this morning.

Barry



 On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

[quote] Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

I'm currently working on cooling my Jabiru 3300 in the Europa. 



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

 



-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

 	  Quote: 	
		  Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

 Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

   --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

  



On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

 

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

     

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

     

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

     

  Thanks for your time and consderation.

   

  Jeff Paris

  

 	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	




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  	  Quote: 	
		  



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[b]

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Jul 23, 2012 4:34 am Post subject: Engine cooling Louver Vents

Hello Carl:



Quicker than I thought.

Here are some pictures:

1 - Pictures 1 & 2 show a side view of what it looks like.  This flap is for a large plane with a hidden exhaust ramp for the out going air so I had it made 1" mounting lip and 2" of hang-down.

 2 - Picture 3 is a isometric view.  The length should be so it spans from one end of an opening to the other.  DO NOT MAKE IT SHORTER THAN THE SPAN.

3 - Picture 4 shows it mounted UNDER the lip of a desk... NO!  The desk does not have a over heating problem EXCEPT around April 15th.  I mount it with the mounting edge INSIDE the exit ramp.  LQQKs better.

 4 - Picture 5 shows a side view of how it should look when mounted.

Hope this helps.  It works GREAT on the applications I have worked on.  

REMEMBER - Without a good exhaust of air flow there cannot be a good input of air flow.  Exit must be at least TWICE the area of Intake.  

 AND! ! !  You must - Have a GREAT seal around the engine with the baffling.  

Every little hole you plug helps improve the cooling. 

Barry

PS

Start with a 45 Deg angle and reduce it from there <-- Reduce it only if needed and if you wish.  I have never reduced it on any of the installs I have done.  DO not go beyond 45 Deg - Not needed - Not any better and at that point it becomes drag.

 Same rules apply as for aileron trim tabs.





On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

  	  Quote: 	
		  Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

 



I'm currently working on cooling my Jabiru 3300 in the Europa.



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

 



-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

 	  Quote: 	
		  Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

 Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

   --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

  



On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

 

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

     

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

     

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

     

  Thanks for your time and consderation.

   

  Jeff Paris

  

 	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	




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  	  Quote: 	
		  



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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Tue Jul 24, 2012 9:15 am Post subject: Engine cooling Louver Vents

Carl:



Did you receive the email and pictures?  Wes, tells me that the pictures did not get posted.

Barry



On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

 [quote]Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

 



I'm currently working on cooling my Jabiru 3300 in the Europa.



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

 



-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

 	  Quote: 	
		  Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

 Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

   --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

  



On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

 

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

     

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

     

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

     

  Thanks for your time and consderation.

   

  Jeff Paris

  

 	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	




href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.matronics.com/Navigator?JabiruEngine-List

href="http://forums.matronics.com/">http://forums.matronics.com

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  	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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



	




[b]

carlmeek(at)gmail.com
Guest

Posted: Tue Jul 24, 2012 9:41 am Post subject: Engine cooling Louver Vents

Hi Barry,



Yes, I received the pictures fine. I'm just trying to puzzle out exactly where the thing mounts ….

Attached is a picture of my new "lip"

Regards,

-Carl.

[img]cid:C6CEFC3D-1FC0-4471-AEC3-166132BD9F2B(at)virtusales.virtusales.com[/img]

On 24 Jul 2012, at 18:14, FLYaDIVE wrote:

 	  Quote: 	
		  Carl:



Did you receive the email and pictures?  Wes, tells me that the pictures did not get posted.

Barry



On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

  	  Quote: 	
		  Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

 



I'm currently working on cooling my Jabiru 3300 in the Europa.



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

 



-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

 	  Quote: 	
		  Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

 Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

   --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

  



On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

 

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

     

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

     

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

     

  Thanks for your time and consderation.

   

  Jeff Paris

  

 	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Tue Jul 24, 2012 2:25 pm Post subject: Engine cooling Louver Vents

WOW Carl...



That this is almost pointing straight down.  Isn't there ANY way you could sweep it back?  As I mentioned you do not want to have an angle there more than 45 Deg.  I would guess you are at 80 Deg.  This is a HUGE amount of Drag and a HUGE  LACK of flow out of the cowl.  

 Also, as mentioned - The exhaust area of a cowl must be at least twice the area of the intake - BUT - In your case the intake must also be increased because of the TURBULENCE and LACK of flow out of the cowl.  Now you have to FORCE more air into the cowl just to overcome the inefficient exhaust area.  This would be more parasitic internal drag.  Not what you want, not for cooling and not for speed - Which is also cooling.

 



If you can - Sweep the exhaust pipe back so it almost parallels the belly - Sweep the fixed cowl flap back.  IF you can not sweep it back ADD a backward curve to the exhaust ramp.  You want the exhaust ramp facing as rear as possible.  Better a tube than a wall.

 



Attached are pictures of a rough sketch.

If what Carl has is the same as what others have that is the #1 cause for high temps.

Barry

 On Tue, Jul 24, 2012 at 1:41 PM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

 	  Quote: 	
		   Hi Barry,



Yes, I received the pictures fine. I'm just trying to puzzle out exactly where the thing mounts ….

Attached is a picture of my new "lip"

 



Regards,

-Carl.

[img]cid:C6CEFC3D-1FC0-4471-AEC3-166132BD9F2B(at)virtusales.virtusales.com[/img]

On 24 Jul 2012, at 18:14, FLYaDIVE wrote:

 

 	  Quote: 	
		  Carl:



Did you receive the email and pictures?  Wes, tells me that the pictures did not get posted.

Barry



On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek(at)gmail.com (carlmeek(at)gmail.com)> wrote:

   	  Quote: 	
		  Barry… I'm interested in your concept here, but I can't understand it.  Any chance of a photo?

  



I'm currently working on cooling my Jabiru 3300 in the Europa.



I've put a 5" lip on the bottom of the cowl exit and this has made a big difference to temperatures in the climb, but it has highlighted uneven cylinder cooling - so my next project is to put some dams to force air between the middle cylinder, and also to route HT leads straight out away from air-flow rather than the bundle of cables blocking it all up.

  



-Carl.



On 23 Jul 2012, at 01:21, FLYaDIVE wrote:

 	  Quote: 	
		  Jeff:



The hard and fast rule for forced air cooling is the EXHAUST area must be at least TWICE the size INTAKE area.  

  Another simple little trick in cooling is to create a negative pressure area directly at the ramp exhaust port(s).  This can be done with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp area and bent lengthwise down the center-line at a 45 deg angle sort of like this

    --->  ___/  [But flip it so it angles DOWN]  Then rivet it to the edge of the air exhaust ramp.  Works great and you will NEVER notice any drag... Just lower temps.

Barry

   



On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:

  

 	  Quote: 	
		    Gentlepeople,

   

  A few months ago someone out on our lists mentioned that they were using some louvered vents in an aid to cooling their Jabiru installation.  I would be interested to see if anyone has some anecdotal or actual experience with utilizing louvered vents on the bottom of a cowl in an effort to aid and imnprove engine cooling.

      

  In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty much dialed into in terms of cooling.  However, I am also a builder of a Jab 3300 powered Europa Classic Monowheel and due to the fact  that the footwells and the main landing gear truncate the bottom opening of the cowl making a clean and big enough exit a bit "messy".

      

  I am curious to see if a set of vented louvers running parallel and under each cylinder would create enough pull to enhance cooling? (Bonanzas have em')  Do the experts think I might have some luck with just such an installation?

      

  Thanks for your time and consderation.

   

  Jeff Paris

  

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