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exhaust pipe clearance

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icubob(at)newnorth.net
Guest

Posted: Wed Aug 27, 2008 3:47 am Post subject: exhaust pipe clearance

hi all, i ran this by the jab list with not too  much response . how much clearance are you allowing between the fiberglass  cowling and the exhaust pipe where it passes thru the cowl?

   also, any opinions on the effectiveness of a  ''lip'' at the rear of the cowl to pull air from the low pressure chamber of the  cowl?

                   any info appreciated. bob noffs

                                                      woodruff, wi

    [quote][b]

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Aug 27, 2008 4:21 am Post subject: exhaust pipe clearance

Bob-

My pipes pass between the cowl lip and the firewall, and there is  

probably (can't measure as engine is out) 1--1/2" to 2" all around  

pipe. With your 3300 engine (right?) you probably can't flip the  

muffler over can you? On my 2200, I could flip the muffler over and  

either have the pipes go through the cowl....holes required...or flip  

the other way and they pass between the cowl lip and the  

firewall....slick!  If it was me, I'd give it an inch clearance,  

paint it with primer, taxi it and see if it looks "cooked"...if so  

add a half-inch more clearance all the way around, and test again.  

When in flight, there should be no more higher temps in that area, I  

wouldn't think, than what you'd see in a ground-run/taxi situation.



The lip is VERY helpful in drawing out the heated air from the cowl  

interior. In fact, it is *strongly* recommended at the Jabiru clinics  

to do this.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs and holding for repairs

Status: "Condition grounded, but determined to try."  (Pink  

Floyd..."Learning to Fly")



On Aug 27, 2008, at 7:47 AM, bob noffs wrote:



 	  Quote: 	
		   hi all, i ran this by the jab list with not too much response . how  

 much clearance are you allowing between the fiberglass cowling and  

 the exhaust pipe where it passes thru the cowl?

   also, any opinions on the effectiveness of a ''lip'' at the rear  

 of the cowl to pull air from the low pressure chamber of the cowl?

                  any info appreciated. bob noffs

                                                     woodruff, wi

 http://www.matronics.com/Navigator?Kitfox-List_- 

 ============================================================ _- 

 forums.matronics.com_- 

 ============================================================ _- 

 contribution_- 

 ============================================================

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Aug 27, 2008 4:36 am Post subject: exhaust pipe clearance

Also, Bob, on that "low pressure" chamber inside the cowl...it  

becomes a low pressure area when you have about 3 times the exit area  

as compared to the inlet area. You need about 3 times the area in  

order to allow for the expanded air to escape...remember that the air  

goes into the air inlets as cool air, then becomes heated and  

expands, and this expansion is why the 3x larger area is needed. The  

lip just makes for a venturi effect, which helps pull the heated air  

from the cowl chamber.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs and holding for repairs

Status: "Condition grounded, but determined to try."  (Pink  

Floyd..."Learning to Fly")



On Aug 27, 2008, at 7:47 AM, bob noffs wrote:



 	  Quote: 	
		   hi all, i ran this by the jab list with not too much response . how  

 much clearance are you allowing between the fiberglass cowling and  

 the exhaust pipe where it passes thru the cowl?

   also, any opinions on the effectiveness of a ''lip'' at the rear  

 of the cowl to pull air from the low pressure chamber of the cowl?

                  any info appreciated. bob noffs

                                                     woodruff, wi

 http://www.matronics.com/Navigator?Kitfox-List_- 

 ============================================================ _- 

 forums.matronics.com_- 

 ============================================================ _- 

 contribution_- 

 ============================================================

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Michel

Joined: 10 Jan 2006
Posts: 966
Location: Norway

Posted: Wed Aug 27, 2008 4:56 am Post subject: exhaust pipe clearance

 	  Quote: 	
		   From: bob noffs [icubob(at)newnorth.net]

 also, any opinions on the effectiveness of a ''lip'' at the rear of the cowl 

 to pull air from the low pressure chamber of the cowl?


	


The best there is, Sir!

Here is a photo of my "lip" and it works like marvel to keep my Jabiru the coolest engine on this side of the galaxy! 



http://home.online.no/~michel/tmp/Heater.jpg



Cheers,

Michel Verheughe

Norway

Kitfox 3 - Jabiru 2200 ... flying as PAX

<pre><b><font size  color="#000000" face="courier new,courier">

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_________________
Kitfox 3 - Jabiru 2200

gary.algate(at)sandvik.co
Guest

Posted: Wed Aug 27, 2008 6:04 am Post subject: exhaust pipe clearance

I agree with Lynn on the cowl lip - I have even increased the outlet area under my Jab installation (Round Cowl) and fitted additional Aluminum lips to increase the pressure reduction (See Foto) 

 

regards 

 

Gary

 

 Gary Algate

 Classic 4 Jab 2200

 Office Phone: +61 8 8276 7655

 

 

 This e-mail is confidential and it is intended only for the addressees. Any review, dissemination, distribution, or copying of this message by persons or entities other than the intended recipient is prohibited. If you have received this e-mail in error, kindly notify us immediately by telephone or e-mail and delete the message from your system. The sender does not accept liability for any errors or omissions in the contents of this message which may arise as a result of the e-mail transmission. 

 

 

 

    

 

 

 

Lynn Matteson <lynnmatt(at)jps.net> 

Sent by: owner-kitfox-list-server(at)matronics.com 

27/08/2008 10:04 PM 

Please respond to

 kitfox-list(at)matronics.com     To

 kitfox-list(at)matronics.com   cc

    Subject

 Re: exhaust pipe clearance 

     

 

 

 

--> Kitfox-List message posted by: Lynn Matteson <lynnmatt(at)jps.net>

 

 Bob-

 My pipes pass between the cowl lip and the firewall, and there is  

 probably (can't measure as engine is out) 1--1/2" to 2" all around  

 pipe. With your 3300 engine (right?) you probably can't flip the  

 muffler over can you? On my 2200, I could flip the muffler over and  

 either have the pipes go through the cowl....holes required...or flip  

 the other way and they pass between the cowl lip and the  

 firewall....slick!  If it was me, I'd give it an inch clearance,  

 paint it with primer, taxi it and see if it looks "cooked"...if so  

 add a half-inch more clearance all the way around, and test again.  

 When in flight, there should be no more higher temps in that area, I  

 wouldn't think, than what you'd see in a ground-run/taxi situation.

 

 The lip is VERY helpful in drawing out the heated air from the cowl  

 interior. In fact, it is *strongly* recommended at the Jabiru clinics  

 to do this.

 

 Lynn Matteson

 Kitfox IV Speedster

 Jabiru 2200, 562 hrs and holding for repairs

 Status: "Condition grounded, but determined to try."  (Pink  

 Floyd..."Learning to Fly")

 

 

 

 

 

 On Aug 27, 2008, at 7:47 AM, bob noffs wrote:

 

 > hi all, i ran this by the jab list with not too much response . how  

 > much clearance are you allowing between the fiberglass cowling and  

 > the exhaust pipe where it passes thru the cowl?

 >   also, any opinions on the effectiveness of a ''lip'' at the rear  

 > of the cowl to pull air from the low pressure chamber of the cowl?

 >                  any info appreciated. bob noffs

 >                                                     woodruff, wi

 > http://www.matronics.com/Navigator?Kitfox-List_- 

 > ============================================================ _- 

 > forums.matronics.com_- 

 > ============================================================ _- 

 > contribution_- 

 > ============================================================

 

 

 -

 -

          -Matt Dralle, List Admin.

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Michel

Joined: 10 Jan 2006
Posts: 966
Location: Norway

Posted: Wed Aug 27, 2008 9:56 am Post subject: exhaust pipe clearance

 	  Quote: 	
		   From: gary.algate(at)sandvik.com

 I have even increased the outlet area 

 under my Jab installation (Round Cowl) and fitted additional Aluminum lips 

 to increase the pressure reduction (See Foto)


	


Size wise, yours looks pretty much like mine, Gary.

.. I mean ... well, you know what I mean! 



Cheers,

Michel Verheughe

Norway

Kitfox 3 - Jabiru 2200

Do not archive

<pre><b><font size  color="#000000" face="courier new,courier">

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_________________
Kitfox 3 - Jabiru 2200

gary.algate(at)sandvik.co
Guest

Posted: Thu Aug 28, 2008 4:24 am Post subject: exhaust pipe clearance

Michael 

 

As you know - Size really does matter 

 

Gary

 

 Gary Algate

 SMC, Exploration

 Office Phone: +61 8 8276 7655

 

 

 This e-mail is confidential and it is intended only for the addressees. Any review, dissemination, distribution, or copying of this message by persons or entities other than the intended recipient is prohibited. If you have received this e-mail in error, kindly notify us immediately by telephone or e-mail and delete the message from your system. The sender does not accept liability for any errors or omissions in the contents of this message which may arise as a result of the e-mail transmission. 

 

 

 

    

 

 

 

Michel Verheughe <michel(at)online.no> 

Sent by: owner-kitfox-list-server(at)matronics.com 

28/08/2008 03:49 AM 

Please respond to

 kitfox-list(at)matronics.com     To

 <kitfox-list(at)matronics.com>   cc

    Subject

 RE: exhaust pipe clearance 

     

 

 

 

 	  Quote: 	
		   From: gary.algate(at)sandvik.com

 > I have even increased the outlet area 
	


 > under my Jab installation (Round Cowl) and fitted additional Aluminum lips 

 > to increase the pressure reduction (See Foto)

 

 Size wise, yours looks pretty much like mine, Gary.

 .. I mean ... well, you know what I mean! 

 

 Cheers,

 Michel Verheughe

 Norway

 Kitfox 3 - Jabiru 2200

 Do not archive

 

 

 <pre><b><font size  color="#000000" face="courier new,courier">

 

 -

 -

          -Matt Dralle, List Admin.

 

 </b></font></pre></body></html> 

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