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A little Help! Muffler -Heat Muff

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4RCSIMMONS(at)comcast.net
Guest

Posted: Mon Nov 02, 2009 10:12 am Post subject: A little Help! Muffler -Heat Muff

Hey folks,



I would like to make my own heat muffs for carb heat and cabin heat.



Dimension are not much of an issue however, can someone tell me what thickness Stainless steel I should use?



From some reading I see it is 304 Stainless that is used and in some cases is Aluminum. Does it matter?

Yes I am trying to save a buck, but want to make it only once.



Thanks,

Rich





 [quote][b]

psm(at)att.net
Guest

Posted: Mon Nov 02, 2009 11:04 am Post subject: A little Help! Muffler -Heat Muff

Hi Rich,



I wouldn't use aluminum for this purpose.  The exhaust gasses get 

around 1400 degrees F, and if I remember correctly aluminum melts 

around 1000 degrees F.  You might wind up with a puddle of aluminum 

in your engine compartment.



I don't have easy access to my airplane right now, but I would guess 

the thickness of the muffs from the Jabiru FWF was around .020 or .025 inches.



Paul

XL awaiting engineering changes



At 10:11 AM 11/2/2009, you wrote:



 	  Quote: 	
		  Hey folks,



I would like to make my own heat muffs for carb heat and cabin heat.



Dimension are not much of an issue however, can someone tell me what 

thickness Stainless steel I should use?



 From some reading I see it is 304 Stainless that is used and in 

 some cases is Aluminum. Does it matter?

Yes I am trying to save a buck, but want to make it only once.



Thanks,

Rich

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Mon Nov 02, 2009 12:02 pm Post subject: Re: A little Help! Muffler -Heat Muff

 	  psm(at)att.net wrote: 	
		  Hi Rich,



I wouldn't use aluminum for this purpose.  	


Somebody better tell Aircraft Spruce. http://www.aircraftspruce.com/search/search.php?query=heat+muff&search=1



CESSNA TYPE HEAT MUFF



Heli-arc welded aluminum muff with rustproof stainless steel fins for clamping to stack.



HOMEBUILDER'S HEAT MUFFS



These superior quality heat muffs are made entirely of 6061 and 5052 aircraft grade aluminum, offset from the center to clear the close cowling of most homebuilts.

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

larry(at)macsmachine.com
Guest

Posted: Mon Nov 02, 2009 4:08 pm Post subject: A little Help! Muffler -Heat Muff

Rich,

I assume you're talking heat-muffs averse mufflers here.  For conveying 

heat from the muffler to the cabin, aluminum is fine for a heat muff.

I used .025 and wrapped it to a hinge joint. If you're doing mufflers, 

you need a .025 or better stainless as the temps recorded 3 inches or so

from the exhaust are near 1350 degrees.  You'll probably make two sets 

to get it exactly right, so don't scrimp on bought material.



Larry McFarland 601HDS at www.macsmachine.com

Rich Simmons wrote:

 	  Quote: 	
		  

 Hey folks,



 I would like to make my own heat muffs for carb heat and cabin heat.



 Dimension are not much of an issue however, can someone tell me what 

 thickness Stainless steel I should use?



 From some reading I see it is 304 Stainless that is used and in some 

 cases is Aluminum. Does it matter?

 Yes I am trying to save a buck, but want to make it only once.



 Thanks,

 Rich



 *



 *

4RCSIMMONS(at)comcast.net
Guest

Posted: Tue Nov 03, 2009 6:16 am Post subject: A little Help! Muffler -Heat Muff

Larry,



Correct, not the muffler! Just the Muff on the outside of the muffler can for cabin heat



The flanges for the scat tubing themselves from ACS are aluminum and with continuous air flow aluminum should be ok.



Not trying to be cheap just frugal. I can make a few things and it saves hundreds of dollars if not more.



Thanks for the comments. 



Rich

 [quote][b]

larry(at)macsmachine.com
Guest

Posted: Tue Nov 03, 2009 6:46 am Post subject: A little Help! Muffler -Heat Muff

Rich,

I should have pointed you to the construct that I did. It works well and 

I've only got 3/8 to 1/2-inch clearance from the muffler

for airflow. No baffles inside either. Just the hard rings at the ends 

to support the wrapper.

http://www.macsmachine.com/images/subaruengine/full/muffports3.gif

http://www.macsmachine.com/images/subaruengine/full/muffports2.gif

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

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



Good luck,

Larry McFarland 601HDS at www.macsmachine.com



Rich Simmons wrote:

 	  Quote: 	
		  

 Larry,



 Correct, not the muffler! Just the Muff on the outside of the muffler 

 can for cabin heat



 The flanges for the scat tubing themselves from ACS are aluminum and 

 with continuous air flow aluminum should be ok.



 Not trying to be cheap just frugal. I can make a few things and it 

 saves hundreds of dollars if not more.



 Thanks for the comments.



 Rich



 *

 *

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Tue Nov 03, 2009 9:14 am Post subject: A little Help! Muffler -Heat Muff

Since you have a water cooled engine, why didn't you just run the  

bypass lines through a heater core in the cabin? That would just about  

eliminate any risk of carbon monoxide in the cabin from an exhaust  

leak. You would also have a smaller penetration through the firewall.

 	  Quote: 	
		   

 >



 Rich,

 I should have pointed you to the construct that I did. It works well  

 and I've only got 3/8 to 1/2-inch clearance from the muffler

 for airflow. No baffles inside either. Just the hard rings at the  

 ends to support the wrapper.

 http://www.macsmachine.com/images/subaruengine/full/muffports3.gif

 http://www.macsmachine.com/images/subaruengine/full/muffports2.gif

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

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


	


-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

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

larry(at)macsmachine.com
Guest

Posted: Tue Nov 03, 2009 1:28 pm Post subject: A little Help! Muffler -Heat Muff

Bryan,

I could easily take the heat directly from the radiator into the cabin, 

but the heat muff keeps hot air out of my belly mounted radiator which 

improves

engine cooling by 7-degrees F.  The 1-1/2-inch hole in the firewall is 

no real penetration nor worry as far as fireproofing goes. Carbon 

monoxide is also

a non-issue as it's monitored at the panel. I get a 20-degree lift in 

near freezing temps from my existing setup, so it works for me and is 

low maintenance.



Larry McFarland 601HDS at www.macsmachine.com

Bryan Martin wrote:

 	  Quote: 	
		   

 <bryanmmartin(at)comcast.net>



 Since you have a water cooled engine, why didn't you just run the 

 bypass lines through a heater core in the cabin? That would just about 

 eliminate any risk of carbon monoxide in the cabin from an exhaust 

 leak. You would also have a smaller penetration through the firewall.

> 

> <larry(at)macsmachine.com>

>

> Rich,

> I should have pointed you to the construct that I did. It works well 

> and I've only got 3/8 to 1/2-inch clearance from the muffler

> for airflow. No baffles inside either. Just the hard rings at the 

> ends to support the wrapper.

> http://www.macsmachine.com/images/subaruengine/full/muffports3.gif

> http://www.macsmachine.com/images/subaruengine/full/muffports2.gif

> http://www.macsmachine.com/images/subaruengine/full/heatmuffler.gif

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

>

4RCSIMMONS(at)comcast.net
Guest

Posted: Wed Nov 04, 2009 4:54 am Post subject: A little Help! Muffler -Heat Muff

Larry!



Thanks for the pics!



They support the concept I have in mind. Combining the pics from the Zenith setup and yours I smell success.



I  think I will make the first one out of heavy card stock and then try and fold the actual metal once.



Are you aware of a good source of spinners! I see the Cummins from Australia that Jabiru uses. Are there any others you can recommend for home built application?



Thanks again!



Rich

---

larry(at)macsmachine.com
Guest

Posted: Wed Nov 04, 2009 6:58 am Post subject: A little Help! Muffler -Heat Muff

Rich,

I obtained my spinner and plates from UHS Spinners, PO Box 135, Markham, 

Ont. L3P 3J5

Phone 905 640 1534

Email uhs(at)istar.ca

They make 8,9,10,11, 12 and 14 inch spinners. These are a fiberglass 

product that is quite good.



Larry McFarland



Rich Simmons wrote:

[quote] Larry!



 Thanks for the pics!



 They support the concept I have in mind. Combining the pics from the 

 Zenith setup and yours I smell success.



 I  think I will make the first one out of heavy card stock and then 

 try and fold the actual metal once.



 Are you aware of a good source of spinners! I see the Cummins from 

 Australia that Jabiru uses. Are there any others you can recommend for 

 home built application?



 Thanks again!



 Rich

 ---

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