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Exhaust spacing

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kkinney

Joined: 11 Jan 2006
Posts: 42

Posted: Thu Apr 12, 2007 10:32 am Post subject: Exhaust spacing

Pardon me if this is a stupid question, what are the design considerations for routing the exhaust system stubs?

Bingelis says the obvious stuff like don't route them too close to anything, I'm hoping for something more specific.



How close is too close to the fiberglass cowling?  Or too close to the firewall?

How much stub do we hang out in the wind?



Any thoughts are welcome.



Thank you,

Kevin Kinney

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agustafson(at)chartermi.n
Guest

Posted: Thu Apr 12, 2007 1:29 pm Post subject: Exhaust spacing

Good questions. I'm waiting for the answers too!



Aaron

 	  Quote: 	
		   Pardon me if this is a stupid question, what are the design considerations 

 for routing the exhaust system stubs?

 Bingelis says the obvious stuff like don't route them too close to 

 anything, I'm hoping for something more specific.



 How close is too close to the fiberglass cowling?  Or too close to the 

 firewall?

 How much stub do we hang out in the wind?

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larry(at)macsmachine.com
Guest

Posted: Thu Apr 12, 2007 1:48 pm Post subject: Exhaust spacing

Kevin,

The exhaust system should have at least half an inch clearance between 

fiberglass parts and air should be directed in

a way that allows flow between these items.  On the firewall, you need 

to keep exhaust as much as 3 inches or more off

it so that any electrical pumps, lines or hoses aren't affected by 

radiated heat.  Another good item is wrapping the exhaust

to contain radiated heat to where it leaves the pipes.  It's very 

effective.  You may, depending on the horsepower output

and rpms you run, require a bit more than the half inch for fiberglass.  

I replaced fiberglass that was that proximate with

aluminum pieces that are less affected.  They cool better and don't 

conduct as much heat into the fiberglass that they blend

with.  First link shows the fiberglass that ultimately browned by the 

heat.  Second link shows the aluminum inserts

and the third link shows how paint tends to blend the aluminum and the 

fiberglass parts so they're not noticed.

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

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

http://www.macsmachine.com/images/completion/full/601ezclosefrtrt.gif

More pictures on the site if you're curious,

Good luck,

Larry McFarland 601HDS at www.macsmachine.com

kkinney wrote:

 	  Quote: 	
		   



 Pardon me if this is a stupid question, what are the design considerations for routing the exhaust system stubs?

 Bingelis says the obvious stuff like don't route them too close to anything, I'm hoping for something more specific.



 How close is too close to the fiberglass cowling?  Or too close to the firewall?

 How much stub do we hang out in the wind?



 Any thoughts are welcome.



 Thank you,

 Kevin Kinney





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=106539#106539

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n801bh(at)netzero.com
Guest

Posted: Thu Apr 12, 2007 5:30 pm Post subject: Exhaust spacing

The best way to explain this is to remember your EGTs will be showing 1400+ degrees f. Now turn on your electric stovetop to high, see the burners glowing nice and orange, and HOT.. That is about 1375 degrees. Hold your hand close and see how long you can stand it. Now build your firewall forward components keeping that in mind.. Radiant heat is nothing to fool around with. It can and will start fires.. 

do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "kkinney" <kkinney(at)fuse.net> wrote:

--> Zenith-List message posted by: "kkinney" <kkinney(at)fuse.net>



Pardon me if this is a stupid question, what are the design considerations for routing the exhaust system stubs?

Bingelis says the obvious stuff like don't route them too close to anything, I'm hoping for something more specific.



How close is too close to the fiberglass cowling?  Or too close to the firewall?

How much stub do we hang out in the wind?



Any thoughts are welcome.



Thank you,

Kevin Kinney





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=106539#106539   [quote][b]

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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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