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10-05-2015, 01:54 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Van's crossover heat muff question
I am working on fitting my exhaust system, it is the one from Vans, along with their newer crossover heat muff. Out of the box, the openings in the heat muff at either end will not quite fit around the enlarged flanges at the slip joints. Is this just supposed to be a very tight fit, do I need to slightly enlarge the openings, or do I have something wrong? The instructions that I found ( https://www.vansaircraft.com/pdf/rev...ther/OP-54.pdf) don't make any mention, other than to say the slip joints must be outside the box. I did measure the openings and found that ones that accommodate the slip joints are 1/16" bigger, but still not quite big enough. Here is a picture of how things look for me:
Any ideas? Thanks!
Chris
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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10-05-2015, 02:51 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Hey Chris,
I've got the same heat muff, and I had to do a little Dremel work to enlarge the cutouts. The holes should be centered on the fat parts of the slip joints.
Fortunately, you don't have to remove too much material.

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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
Last edited by rightrudder : 10-05-2015 at 02:54 PM.
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10-05-2015, 03:02 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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The intent is for a tight net fit.
It is not intended that you would have to enlarge the holes as Doug did, but since the tube expanding process is not high precision, I can see some of them being a bit tight occasionally.
It should only require removing a few thousandths with a sanding drum.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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10-05-2015, 03:23 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Just what I needed to hear/see. Thanks to both of you
Chris
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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10-05-2015, 03:25 PM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,118
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Mine did not require enlarging. Fit tight right out of the box.
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10-05-2015, 06:38 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Is that crossover heat muff the new "standard" muff?
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-05-2015, 06:52 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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I believe they still carry the old style, but this is what is included in their exhaust kit. Some other threads on here indicate that it is supposed to be more effective, and people have been pleased with it.
Quote:
Originally Posted by N941WR
Is that crossover heat muff the new "standard" muff?
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Chris
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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10-05-2015, 07:33 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by YellowJacket RV9
I believe they still carry the old style, but this is what is included in their exhaust kit. Some other threads on here indicate that it is supposed to be more effective, and people have been pleased with it.
Chris
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Thanks! I was just curious.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-05-2015, 09:31 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by N941WR
Is that crossover heat muff the new "standard" muff?
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It is the heat muff included with the exhaust system for the parallel valve O-320/O-360 that is manufactured by Van's
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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10-06-2015, 10:32 AM
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Join Date: Nov 2008
Location: La Sarre, Qu?bec, Canada
Posts: 90
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Scat tube from heater to firewall
I'm curious about how you will route your tube from the heat muff and the firewall. I right here and I can't figure where I will route this tube. I don't want to interfer with my throttle cable, the exhaust and the cowl... If someone have a pics of that... Thanks
__________________
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Martin "Closterman" Rousseau
www.mraerodesign.com
Piper Cherokee C-FEYI (sold)
RV-7A C-GMYL Status : FLYING with perpetual RV Grin!!!
RV-9A Status : Tail & Wing 90% Fuselage: 10%
Hatz Classic : building wings (on hold)
http://www.mykitlog.com/Closterman/
Donated to VAF (12-2017)
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