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01-28-2009, 08:30 AM
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Join Date: May 2005
Location: San Ramon, CA
Posts: 402
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Baffle penetration
Hi folks,
I have to penetrate my rear baffle for a couple of wires (to LSE coils) and for the AFP purge valve control. I need to line the holes with something for seal and anti-chaff. I don't really know how hot the baffles get. I am talking about two or three 1/4 to 3/8 holes. Should I line these with rubber grommets, snap bushings or something else? Rubber grommets would be the best solution except I was worrying about them melting. I searched this a couple of ways and couldn't come up with an answer. Thoughts?
Michael Wynn
RV 8 FWF
San Ramon, CA
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01-28-2009, 09:10 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,647
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The rubber grommets will be fine; after all, the baffle seal material is also fiber reinforced rubber. There are some special fittings for this, but I just went with the grommets.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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01-28-2009, 10:22 AM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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After using the rubber grommet.
Use high temp RTV to seal all holes (air leaks) in the baffles.
Kent
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Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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01-29-2009, 10:23 AM
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Join Date: Aug 2005
Location: Virginia Beach, VA
Posts: 474
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I used the snap bushings and then a filet of red RTV goop to seal everything.
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Tim Ribble
Virginia Beach
RV-6A (only took 13 years to build  )
N621TR In unrestricted operation 
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01-29-2009, 07:11 PM
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Join Date: Dec 2005
Location: Sedalia, Colorado (KAPA)
Posts: 320
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Seal
Cirrus uses some sort of black caulk-like material to seal the firewall. Looks easier/neater to work with than silicone. Anybody know what the stuff is?
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Duane Zavadil
RV-6a, IO-320
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01-30-2009, 08:45 AM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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Most likely it's....
Quote:
Originally Posted by zav6a
Cirrus uses some sort of black caulk-like material to seal the firewall. Looks easier/neater to work with than silicone. Anybody know what the stuff is?
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Black RTV. Most of my baffles were seal with the black kind. It has a lower temp. rating then the red and a lower cost. I used the red in a few places where I thought it might get hotter.
Kent
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Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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01-30-2009, 04:43 PM
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Join Date: Aug 2005
Location: savannah
Posts: 355
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plastic
snap bushings have held up for 50+ hrs so far. LSE ign wires. . .
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james kleen
savannah
RV8sp - RV3
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