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3300 Exhaust

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aprazer

Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho

Posted: Tue Feb 20, 2007 12:47 pm Post subject: 3300 Exhaust

Ladies and Gents,

Looking for a solution as what to do with my cowling. I have approximately 1/4 inch between the fiberglass and the exhaust pipe. I have considered wrapping the exhaust pipe with the insulating wrap that Aircraft Spruce sells for $43 for 50' 2" roll or trimming the cowling, which could be unsightly.

Any and all suggestions will be greatly appreciated.

Thanks,

Mack 

601XL in final stages

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_________________
The poh-oh-unemployed farm boy from Idaho

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Tue Feb 20, 2007 1:07 pm Post subject: 3300 Exhaust

I wrapped my exhaust system and haven't had any trouble with it in  

180 flight hours. That price is cheaper than J. C. Whitney's.



 	  Quote: 	
		   



 Looking for a solution as what to do with my cowling. I have  

 approximately 1/4 inch between the fiberglass and the exhaust pipe.  

 I have considered wrapping the exhaust pipe with the insulating  

 wrap that Aircraft Spruce sells for $43 for 50' 2" roll or trimming  

 the cowling, which could be unsightly.


	


-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

japhillipsga(at)aol.com
Guest

Posted: Tue Feb 20, 2007 1:41 pm Post subject: 3300 Exhaust

Mack, exactly where is the pipe close to the cowl and how much pipe ? If it is at a bend and only a small portion is near it it may not be a problem. Also, inside the cowl a bunch of air is pulling though to the bottom exit real fast and my ground and flight tests of inside cowl tempts were very reasonable. Up on the firewall at the rectifier, with the air temperature on the ground of 100 degrees, at 3500 feet and 135 mph the max temperature was 123 degrees on my digital meter. On the ground after the flight during taxi it went down to 93 degrees which was 7 degrees cooler than the   outside temperature. Weird huh ? Even in hot Georgia summertime. Before doing any cowl cutting I would suggest you do more checking. The distance of 1/4 inch you speak of is about the distance I have on my bottom end where the pipes exit the cowl and I have seen no heat marks. Best regards, Bill of Georgia

    

  

 --

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larry(at)macsmachine.com
Guest

Posted: Tue Feb 20, 2007 1:57 pm Post subject: 3300 Exhaust

Hi Mack,

You have two options, one of making an adaptive bump in your lower cowl 

which can look good.

Or the cowl can be trimmed out and an extension of aluminum that will 

withstand the temps better.

I've done both of these progressing from the first to the second option 

and also have wrapped my

stainless exhaust with the belting.  It can be neatly done and not foul 

your sensitivities or prevent you

from putting in EGT sensors.  See the following links from my cowl page 

and engine page.



http://www.macsmachine.com/images/cowling/full/formnmold.gif

http://www.macsmachine.com/images/cowling/full/matoverlay.gif

http://www.macsmachine.com/images/cowling/full/lowercowl1.gif



http://www.macsmachine.com/images/cowling/full/cowlfairingsinside.gif

http://www.macsmachine.com/images/cowling/full/cowelfrtlower.gif



http://www.macsmachine.com/images/subaruengine/full/exhaustwrapsilver.gif

Neither of these are hard to do.

Good luck,



Larry McFarland 601HDS at www.macsmahine.com



aprazer wrote:

 	  Quote: 	
		   



 Ladies and Gents,

 Looking for a solution as what to do with my cowling. I have approximately 1/4 inch between the fiberglass and the exhaust pipe. I have considered wrapping the exhaust pipe with the insulating wrap that Aircraft Spruce sells for $43 for 50' 2" roll or trimming the cowling, which could be unsightly.

 Any and all suggestions will be greatly appreciated.

 Thanks,

 Mack 

 601XL in final stages



 --------

 The poh-oh-unemployed farm boy from Idaho

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tonyplane(at)bellsouth.ne
Guest

Posted: Tue Feb 20, 2007 2:15 pm Post subject: 3300 Exhaust

 	  Quote: 	
		   	  Quote: 	
		  Mack,I do not know what the clearance is on mine, but it is close.  I hope to be enjoying the sky tomorrow and will look; however, Ishould think that the temps near the end of the exhaust pipes would notbe too high with the 1/4 inch clearance to cause any heat distortion,especially considering the airflow in the area.  I would definitely not trim cowling lip, as that helps to create the low pressure for cowling airflowfor cooling the cylinders.Tony GrazianoXL/Jab3300A N493TG 209 hrs I do not know what the clearance is on mine, but it is close.  	
0 	  Quote: 	
		  I do not know what the clearance is on mine, but it is close.  	
1 	


   [quote][b]

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n801bh(at)netzero.com
Guest

Posted: Tue Feb 20, 2007 2:28 pm Post subject: 3300 Exhaust

What part of Idaho are ya in??. if you are in the east side, I am in Jackson Hole and have extra ceramic header wrap that I use on my beast. Contact me off list if ya need a little to shield your cowling. 

do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "aprazer" <aprazer(at)cableone.net> wrote:

--> Zenith-List message posted by: "aprazer" <aprazer(at)cableone.net>



Ladies and Gents,

Looking for a solution as what to do with my cowling. I have approximately 1/4 inch between the fiberglass and the exhaust pipe. I have considered wrapping the exhaust pipe with the insulating wrap that Aircraft Spruce sells for $43 for 50' 2" roll or trimming the cowling, which could be unsightly.

Any and all suggestions will be greatly appreciated.

Thanks,

Mack 

601XL in final stages



--------

The poh-oh-unemployed farm boy from Idaho





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=96329#9632===============================================   [quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Tue Feb 20, 2007 4:57 pm Post subject: 3300 Exhaust

Install the wrap and...put a reflective heat shield of heavy BBQ type foil

inside the cowl.  Try it for a circuit and then check the temp on the cowl.

Make sure there is no direct contact of the inside of the cowl with the hot

exhaust pipe.



Noel



[quote] --

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

aprazer

Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho

Posted: Wed Feb 21, 2007 1:51 pm Post subject: Re: 3300 Exhaust

Thanks everyone -- you have been very helpful!

Mack

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