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Blast Tubes for Mags?

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Tue May 29, 2007 4:46 pm Post subject: Blast Tubes for Mags?

Has anyone routed a blast tube to cool their mags? Apparently some 

aircraft are know for having problems with heat and mags. Living in AZ, 

any time I hear of a heat issue I pay attention. I'm at the point where, 

if I'm going to do it it Now would be the time. So If anyone has done 

this I'd be appreciative of any pictures you might have or would be 

willing to share as well as any information regarding how you installed 

them. e.g. where exactly do you direct the air to on the mag? Which part 

is it that get the hottest?



Thanks



Deems Davis # 406

Baffling / Plenum / Engine Stuff

http://deemsrv10.com/

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Tue May 29, 2007 5:18 pm Post subject: Blast Tubes for Mags?

One of the bench checks in rebuilding a Mag is to heat the capacitor to

see if its ability degrades with modest heat increase. Unfortunately,

you must cool the case and cap to achieve the desired cool operating

temperature.



Blast tubes do localize the cooling at the point of discharge.



John #600



--

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ScooterF15

Joined: 19 Jun 2006
Posts: 136

Posted: Wed May 30, 2007 3:08 am Post subject: Blast Tubes for Mags?

I used the Van's cooling kits supplied with the Firewall Forward kit.  Really it's just a piece of corrugated tubing held into a hole in the  baffles with hi temp silicone. The left one is directed at the left mag. I  don't have a right mag so I pointed the right blast tube at the heater valves /  firewall just forward of the tunnel; that's one of a few different tunnel  heat fixes I did (not sure if it did any good, but the tunnel stays  cool).

  

 I had an A&P look at my engine a couple months ago. He didn't like the  fact that I had the blast tubes secured to my engine mount with zip ties. He  said that the tolerance for wear on the engine mount frame was very small and  that zip ties will eventually chafe enough to cause wear. So as you can see from  the photos the blast tubes are held by a healthy glob of red silicone.

  

 -Jim

 40134

  

  

  

 In a message dated 5/29/2007 8:48:31 P.M. Eastern Daylight Time,  deemsdavis(at)cox.net writes:

  	  Quote: 	
		  -->    RV10-List message posted by: Deems Davis <deemsdavis(at)cox.net>



Has    anyone routed a blast tube to cool their mags? Apparently some 

aircraft    are know for having problems with heat and mags. Living in AZ, 

any time I    hear of a heat issue I pay attention. I'm at the point where, 

if I'm going    to do it it Now would be the time. So If anyone has done 

this I'd be    appreciative of any pictures you might have or would be 

willing to share    as well as any information regarding how you installed 

them. e.g. where    exactly do you direct the air to on the mag? Which part 

is it that get the    hottest?



Thanks



Deems Davis # 406

Baffling / Plenum / Engine    Stuff

http://deemsrv10.com/

	


 



  

 Jim "Scooter"  McGrew

http://www.mit.edu/~jsmcgrew  



See what's free at AOL.com.

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