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My Tunnel Heat Fix

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ScooterF15

Joined: 19 Jun 2006
Posts: 136

Posted: Thu Aug 17, 2006 8:38 pm Post subject: My Tunnel Heat Fix

Second try to post this message:

 

 

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   I heard about the tunnel heat problem a little late and I built only a few preemptive things into the plane. I put ceramic gaskets behind the heater valves to keep heat from transfering to the firewall/tunnel. I installed a blast tube on the firewall forward of the tunnel. And I installed a computer fan in the tunnel cover just over the fuel pump (this actually made a big difference in tunnel heat once I turned it on.)

    

   These things didn't fix the problem, but here's what did. I was having CHT and oil temp overheating problems and one of the things I did to fix this problem was increase the cowl air exit area to improve air flow. As you can see from the photo I enlarged one of the louvers and added an additional one - this didn't make much difference alone. Then I trimmed the aft edge of the "reverse scoop" forward about an inch (see photo). This increases the exit area, but I think it also allows the hot air to move down and away from the fuse and disipate faster.

    

   I'm sure that I added extra drag to my plane, but the engine and tunnel are now cool.

    

   Jim McGrew

   40134 - flying

     

 

 

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Tim(at)MyRV10.com
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Posted: Thu Aug 17, 2006 9:18 pm Post subject: My Tunnel Heat Fix

Congrats on the fix!   That really doesn't look bad at all.

I wonder if just trimming that aft 1" of the cowl alone would

improve things the majority of what you noticed.



At any rate, it's great to see someone trying different things.

I didn't have the problem, but decided to try to make things

as cool as possible.  If forgot to add this link to my list

tonight, but here are some vetterman exhaust extensions I added.

http://www.myrv10.com/N104CD/upgrades/20060807/index.html

For people who saw it at OSH, you could really tell that my

pipes were shorter than the newest ones.  And, not wanting

to miss out on the "mine is longer" competition, I decided to

give it a whirl.  No real change.  I may just try hacking off

that rear 1" though...that seems really simple and reasonable.



Tim Olson - RV-10 N104CD - Flying

do not archive

jsmcgrew(at)aol.com wrote:

 	  Quote: 	
		   Second try to post this message:

 

 On my first 3 flights the tunnel got very warm. You could still hold 

 your hand on it (just barely) but it was hot in there. Additionally, the 

 belly of the aircraft just aft of the cowling was HOT after the flight. 

 Now that I've made some easy changes the tunnel is cool to lukewarm and 

 there is no appreciable heat on the belly after flight. I've been flying 

 in 80 to 90+ degree weather with the heater scat tubing connected.

  

 I heard about the tunnel heat problem a little late and I built only a 

 few preemptive things into the plane. I put ceramic gaskets behind the 

 heater valves to keep heat from transfering to the firewall/tunnel. I 

 installed a blast tube on the firewall forward of the tunnel. And I 

 installed a computer fan in the tunnel cover just over the fuel pump 

 (this actually made a big difference in tunnel heat once I turned it on.)

  

 These things didn't fix the problem, but here's what did. I was having 

 CHT and oil temp overheating problems and one of the things I did to fix 

 this problem was increase the cowl air exit area to improve air flow. As 

 you can see from the photo I enlarged one of the louvers and added an 

 additional one - this didn't make much difference alone. Then I trimmed 

 the aft edge of the "reverse scoop" forward about an inch (see photo). 

 This increases the exit area, but I think it also allows the hot air to 

 move down and away from the fuse and disipate faster.

  

 I'm sure that I added extra drag to my plane, but the engine and tunnel 

 are now cool.

  

 Jim McGrew

 40134 - flying

 ------------------------------------------------------------------------

 

 [Image Removed]

 

 ------------------------------------------------------------------------

- The Matronics RV10-List Email Forum -

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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coop85(at)bellsouth.net
Guest

Posted: Fri Aug 18, 2006 3:58 am Post subject: My Tunnel Heat Fix

Jim,  

    Great fix and I’m glad it worked so well, may end up doing that myself.  The really impressive thing is the nerve to make the changes since they would be tough to undo.  That’s the great thing about homebuilts, think of a fix and act on it.  Not everyone would have the conviction to do it though – great job!  

   

Marcus  

         

  

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of jsmcgrew(at)aol.com

 Sent: Thursday, August 17, 2006 3:59 PM

 To: rv10-list(at)matronics.com

 Subject: My Tunnel Heat Fix  

  

     

Second try to post this message:  

      

On my first 3 flights the tunnel got very warm. You could still hold your hand on it (just barely) but it was hot in there. Additionally, the belly of the aircraft just aft of the cowling was HOT after the flight. Now that I've made some easy changes the tunnel is cool to lukewarm and there is no appreciable heat on the belly after flight. I've been flying in 80 to 90+ degree weather with the heater scat tubing connected.  

    

   

    

I heard about the tunnel heat problem a little late and I built only a few preemptive things into the plane. I put ceramic gaskets behind the heater valves to keep heat from transfering to the firewall/tunnel. I installed a blast tube on the firewall forward of the tunnel. And I installed a computer fan in the tunnel cover just over the fuel pump (this actually made a big difference in tunnel heat once I turned it on.)  

    

   

    

These things didn't fix the problem, but here's what did. I was having CHT and oil temp overheating problems and one of the things I did to fix this problem was increase the cowl air exit area to improve air flow. As you can see from the photo I enlarged one of the louvers and added an additional one - this didn't make much difference alone. Then I trimmed the aft edge of the "reverse scoop" forward about an inch (see photo). This increases the exit area, but I think it also allows the hot air to move down and away from the fuse and disipate faster.  

    

   

    

I'm sure that I added extra drag to my plane, but the engine and tunnel are now cool.  

    

   

    

Jim McGrew  

    

40134 - flying  

        

  

  

  

       

[Image Removed]   

  

        [quote][b]

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