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Hose Interference

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karolamy(at)roadrunner.co
Guest

Posted: Mon Feb 09, 2015 9:39 am Post subject: Hose Interference

Well, haven't seen any posts for a few days so here is a little tip that hopefully someone can use:  On my hose that runs from the left firewall heat box to the exhaust heat muff there was interference with the fuel line, the breather tube, and the oil cooler.  My thinking was that simply changing the length of the hose or twisting it would solve the issue.  Not so for me.  After taking 5 minutes to cut, fit, and install the right side and stewing over this issue on the left for an hour, a default to the ACS Catalog Page 388 offered some hope.  A quick trip to the So Cal ACS gave me part # 08-00863 in hand.  It fit perfectly and offered clearance for all three points of interference.  All for $29.50, not bad for aircraft parts and a nice neat fix.  



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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Mon Feb 09, 2015 11:18 am Post subject: Re: Hose Interference

Might be better for future readers using the "search" function if you edited your post and changed "hose" to "scat tubing".

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Bob Turner
RV-10 QB

bill.peyton

Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO

Posted: Tue Feb 10, 2015 6:00 am Post subject: Re: Hose Interference

The moment of that extension will put a lot of stress on the output flange of the heat muff.  I have never heard of the interference problem before, nor did I have one.

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Bill
WA0SYV
Aviation Partners, LLC

flying-nut(at)cfl.rr.com
Guest

Posted: Tue Feb 10, 2015 6:20 am Post subject: Hose Interference

I agree .... I just looked at my installation (I'm still building) and 

my scat tube doesn't come near interfering with anything.  I suspect 

that the scat tube Rich is installing might be cut too long.  My scat 

tube has a nice, graceful curve from the muff to the heat box.

Linn



On 2/10/2015 9:00 AM, bill.peyton wrote:

 	  Quote: 	
		   



 The moment of that extension will put a lot of stress on the output flange of the heat muff.  I have never heard of the interference problem before, nor did I have one.



 --------

 Bill

 WA0SYV

 Aviation Partners, LLC





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=438205#438205





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davidsoutpost(at)comcast.
Guest

Posted: Tue Feb 10, 2015 6:28 am Post subject: Hose Interference

No alignment or interference with mine either.   

From: "bill.peyton" <peyton.b(at)sbcglobal.net>

To: rv10-list(at)matronics.com

Sent: Tuesday, February 10, 2015 9:00:38 AM

Subject: RV10-List: Re: Hose Interference

--> RV10-List message posted by: "bill.peyton" <peyton.b(at)sbcglobal.net>

The moment of that extension will put a lot of stress on the output flange of the heat muff.  I have never heard of the interference problem before, nor did I have one.

--------

Bill 

WA0SYV

Aviation Partners, LLC

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=438205#438205

 [quote][b]

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Mauledriver(at)nc.rr.com
Guest

Posted: Tue Feb 10, 2015 10:46 am Post subject: Hose Interference

On 2/10/2015 9:16 AM, Linn Walters wrote:

 	  Quote: 	
		   My scat tube has a nice, graceful curve from the muff to the heat box. 


	


Well stated.

do not archive

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karolamy(at)roadrunner.co
Guest

Posted: Tue Feb 10, 2015 10:53 am Post subject: Hose Interference

 	  Quote: 	
		   Bob, agree scat tubing or scat "ducting" per ACS might have been better.  Bottom of my page says may not edit your post.  

Bill, many have complained that the heat coming out of the front box is a bit much.  Possibly the 90 degree bend will decelerate the air flow creating a positive outcome, but it is highly doubtful that it will cause the flange welds to be ripped out of the heat muff.  Is that what you meant?
	


Linn, in fitting this left side scat I started with a longer than desired piece.  Then progressively cut it down about an inch at a time, refitting and rechecking,  each time with an undesirable outcome.  For my application it was:  if I clear the fuel line it hits the cooler, if I clear the cooler it hits the fuel line, etc.  

Look at Section FF6, page 5 in the plans.  In the bottom middle picture it looks like the scat may be hitting/rubbing against the oil cooler right behind the crossover bracket.  My plans are old & maybe things have changed.  But, that's about what I was dealing with.  Wasn't interested in RTVing Air Seal Fabric onto the hose as suggested on previous page.  

Also, I should add that I do have SS aftermarket heat boxes and aftermarket cooler, although I'm pretty sure their dimensions are the same as factory.  Regarding the fuel line, we probably all have somewhat similar installations, yet each will be slightly different in routing, securing and final fit.

Didn't mean to stir the pot or create a problem for anyone, just offering up a suggestion for fellow builders that appears to be a solution, not too expensive, and/or that the elbow might be used somewhere else in someone's build - experimental!



PS:  a 45 degree would be even better



Rich Hansen

 	  Quote:

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flying-nut(at)cfl.rr.com
Guest

Posted: Tue Feb 10, 2015 11:10 am Post subject: Hose Interference

On 2/10/2015 1:50 PM, Rich Hansen wrote:

 	  Quote: 	

> Bob, agree scat tubing or scat "ducting" per ACS might have been better.  Bottom of my page says may not edit your post.

 Bill, many have complained that the heat coming out of the front box is a bit much.

You can cover some of the muff inlet on the baffle with some metal tape 

to cut down the flow of air.  My Grumman came from the factory that way 

with no ill effects.

I used red RTV to glue a thin sheet of RTV on the heat valve to help 

seal off the port through the firewall.

Linn

do not archive

 	  Quote: 	

snip

 	  Quote: 	

 Rich Hansen

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Wed Feb 11, 2015 9:22 am Post subject: Re: Hose Interference

I didn't have any interference.  You might want to adjust he clocking of the heat muff outlet to better line up between the engine mount gap. 



One thing I did on the left side was put a tiny scoop at the inlet to increase the airflow and decrease the temperature of the air which was very hot. I run both my FWD and aft heat off that muff by using Van's Y splitter inside the tunnel.  With the scoop I get plenty of nice warm air both fwd and aft. 

I took the muff off the right side and run scat from the back of the baffle straight to the valve which is open inside the tunnel allowing me to keep the tunnel nice and cool as necessary.

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Myron Nelson
Mesa, AZ
Flew May 10 2014

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