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Clearance between cowling and exhaust pipe

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Tue Jun 30, 2009 12:12 am Post subject: Clearance between cowling and exhaust pipe

I've got the big daft single down pipe on my exhaust and have to cut out the cowling to go round it.  

How much should I make the gap so that the fibreglass doesn't get scorched?  

I've got about 1/8" at the moment, enough?   

Regards, Clive     [quote][b]

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info(at)flylightning.net
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Posted: Tue Jun 30, 2009 5:23 am Post subject: Clearance between cowling and exhaust pipe

Clive,  

   

1/8” should be ok. I would go with a ¼”. Than you can get some ¼” thick PVC pipe and slide it over the tail pipe for a spacer, than lay glass from the cowl over the pipe to make a exhaust tunnel, looks really good.  

   

Nick  

   

         

  

From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of James, Clive R

 Sent: Tuesday, June 30, 2009 3:10 AM

 To: lightning-list(at)matronics.com

 Subject: Clearance between cowling and exhaust pipe  

  

   

I've got the big daft single down pipe on my exhaust and have to cut out the cowling to go round it. 

 How much should I make the gap so that the fibreglass doesn't get scorched? 

 I've got about 1/8" at the moment, enough?   

Regards, Clive    	  Quote: 	
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        [quote][b]

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N1BZRich(at)AOL.COM
Guest

Posted: Tue Jun 30, 2009 5:35 am Post subject: Clearance between cowling and exhaust pipe

Clive,

  

     I would also recommend 1/4" as Nick  suggested.  Remember the engine will actually move around a little in  flight as you pull Gs.  Those rubber shock mounts really help to reduce any  major vibrations from being transmitted to the fuselage, but they do allow  the engine to move around some - as they were designed to do.  The exhaust  tunnel that Nick mentioned really does look nice and gives a great finished  look.  Might even add at least 50 knots.  

 Buz

 Make your summer sizzle with fast and easy recipes for the grill.

  [quote][b]

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info(at)flylightning.net
Guest

Posted: Tue Jun 30, 2009 5:59 am Post subject: Clearance between cowling and exhaust pipe

Close testing show 47.5knts calibrated….well that’s what I like to believe. Should add 50knts to the looks though!  

   

nick  

         

  

From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of N1BZRich(at)aol.com

 Sent: Tuesday, June 30, 2009 8:31 AM

 To: lightning-list(at)matronics.com

 Subject: Re: Lightning-List: Clearance between cowling and exhaust pipe  

  

     

Clive,  

    

   

    

    I would also recommend 1/4" as Nick suggested.  Remember the engine will actually move around a little in flight as you pull Gs.  Those rubber shock mounts really help to reduce any major vibrations from being transmitted to the fuselage, but they do allow the engine to move around some - as they were designed to do.  The exhaust tunnel that Nick mentioned really does look nice and gives a great finished look.  Might even add at least 50 knots.    

    

Buz  

    

       

  

Make your summer sizzle with fast and easy recipes for the grill.  

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dashvii(at)hotmail.com
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Posted: Tue Jun 30, 2009 1:28 pm Post subject: Clearance between cowling and exhaust pipe

It does look super nice.  Much like a Cirrus exhaust or something.  Didn't some Esqual's use the same type of material that you wrap headers for your car on the inside of the cowl in tight spots by the exhaust to keep from bubbling the paint?  Brian W.



From: info(at)flylightning.net

To: lightning-list(at)matronics.com

Subject: RE: Clearance between cowling and exhaust pipe

Date: Tue C 30 Jun 2009 08:58:26 -0500



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Close testing show 47.5knts calibrated….well that’s what I like to believe. Should add 50knts to the looks though!  

   

nick  

         

  

From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of N1BZRich(at)aol.com

 Sent: Tuesday C June 30 C 2009 8:31 AM

 To: lightning-list(at)matronics.com

 Subject: Re: Lightning-List: Clearance between cowling and exhaust pipe  

  

     

Clive C  

    

   

    

    I would also recommend 1/4" as Nick suggested.  Remember the engine will actually move around a little in flight as you pull Gs.  Those rubber shock mounts really help to reduce any major vibrations from being transmitted to the fuselage C but they do allow the engine to move around some - as they were designed to do.  The exhaust tunnel that Nick mentioned really does look nice and gives a great finished look.  Might even add at least 50 knots.    

    

Buz  

    

       

  

Make your summer sizzle with fast and easy recipes for the grill.  

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Jul 01, 2009 11:25 pm Post subject: Clearance between cowling and exhaust pipe

The 'tunnel' sounds a good idea which I'll fit.  Thanks.



Next question, how long should I make the end on the exhaust that  comes out of the cowling? Currently it's 10" out of the bottom of the cowling  which puts the tail pipe 6.5 inches clear of the fuselage belly. I figure I can  trim some off, after flying my Jabiru with hot feet for 10 years I'd like to  avoid that but minimise the protuberance (big word...).



Thanks again  guys, Regards, Clive

[img]cid:015561907(at)02072009-1BE0[/img]



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