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AirMike
Joined: 27 Feb 2007
Posts: 514
Location: Nevada
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 Posted: Sun Jan 03, 2010 5:18 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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It is a real pain to install/remove the cowl with the baffle interface seal on the FAB. I know at least one RV10 builder who has eliminated the baffle seal material at the interface. In discussing this problem with another builder, I was wondering if any builder has come up with a unique solution to this problem or the technical ramifications of leaving the seal material off.
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See you OSH '18
Q/B - sold. |
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jesse(at)saintaviation.co
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| Posted: Sun Jan 03, 2010 5:43 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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What some have done is leave a bigger gap and use a thicker seal material to bridge the gap. The main loss would be a little of the ram air effect on Manifold Pressure. I've heard this is mainly an issue at altitude.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Jan 3, 2010, at 8:18 PM, AirMike wrote:
| Quote: |
It is a real pain to install/remove the cowl with the baffle interface seal on the FAB. I know at least one RV10 builder who has eliminated the baffle seal material at the interface. In discussing this problem with another builder, I was wondering if any builder has come up with a unique solution to this problem or the technical ramifications of leaving the seal material off.
--------
OSH '10 or Bust
Q/B - testing phase 1
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 79960#279960
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ricksked(at)cox.net
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| Posted: Sun Jan 03, 2010 5:46 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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I left mine off and have at the most a gap of 3/16" between the FAB and the snorkel. I was hoping someone could tell me if it's an issue because the engine runs fine. I admit that it bothers me that I don't have the seal but I may go with the Harmon Rocket scoop Don McDonald used....I love that look:!
Rick Sked
N246RS
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carl.froehlich(at)verizon
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| Posted: Sun Jan 03, 2010 6:09 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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On the 8A I modified the cowl inlet, extending it forward and adding a shark
fin between the inlet and the top of the bottom cowl. The FAB was modified
to accept a 3" SCAT hose. I made and then glassed in a 2" long tube to the
inside of the cowl inlet, the tube diameter such that the 3" hose slides
over it. The hose is attached to the FAB with a hose clamp, and slides on
the outside of the lower cowl tube. As the hose is slightly longer than the
gap between the cowl and the FAB, the hose spring keeps it in place. I'll
do something similar for the 10.
Attached is a photo of the second cowl mod - still in primer gray at that
point. I had to move the intake back 3/4" for prop clearance when I
upgraded to a Hartzell CS prop on the 8A.
Carl
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sun Jan 03, 2010 6:32 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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2 problems...
1) You will lose some intake pressure where you may have had a little
RAM air effect.
2) The bigger problem....you may leak air and pressurize your lower
cowling, which would then cause it to be at a higher pressure, which
would then cause the differential from above the cylinders to below
the cylinders to be less, which could cause cooling problems from
both cylinders, and/or oil cooling. I know it's a pain, but
the best move is to just rework that area until it's bearable.
Mine is a very good close seal. I save some headaches by doing
plain oil changes without removing the lower cowl.
Tim Olson - RV-10 N104CD
AirMike wrote:
| Quote: |
It is a real pain to install/remove the cowl with the baffle
interface seal on the FAB. I know at least one RV10 builder who has
eliminated the baffle seal material at the interface. In discussing
this problem with another builder, I was wondering if any builder has
come up with a unique solution to this problem or the technical
ramifications of leaving the seal material off.
-------- OSH '10 or Bust Q/B - testing phase 1
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 79960#279960
|
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dave.saylor.aircrafters(a
Guest
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| Posted: Sun Jan 03, 2010 9:24 pm Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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I built up the inlet of the airbox so it has a flat face parallel to the crank flange, then glued a smooth plastic "O" to it made from something like .032 PVC sheet. Aluminum would work too. Then I built the inside of the cowl aft to within a half-inch of the "O" and filled the half-inch gap with a soft foam seal. The seal is glued to the cowl and it just compresses about 1/8" when the cowl goes on. The smooth plastic is the sealing surface that the foam contacts. There's no mechanical connection so the FAB can move around all it wants.
You hardly notice it's there, and it can't fold down to block the inlet.
I'll look for some pictures tomorrow.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sun, Jan 3, 2010 at 5:18 PM, AirMike <Mikeabel(at)pacbell.net (Mikeabel(at)pacbell.net)> wrote:
[quote] --> RV10-List message posted by: "AirMike" <Mikeabel(at)Pacbell.net>
It is a real pain to install/remove the cowl with the baffle interface seal on the FAB. I know at least one RV10 builder who has eliminated the baffle seal material at the interface. In discussing this problem with another builder, I was wondering if any builder has come up with a unique solution to this problem or the technical ramifications of leaving the seal material off.
--------
OSH '10 or Bust
Q/B - testing phase 1
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=279960#279960
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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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| Posted: Mon Jan 04, 2010 9:24 am Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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[quote]I left a small extension on the cowl inlet that fits inside of a short length of SCAT tube. The SCAT tube is inserted into a recess built into the filtered air box. There are two fingers attached to the outside of the FAB that hold the SCAT tube in a retracted position while the bottom cowl is raised into position. After the cowl is positioned the fingers are pushed aside and that allows the SCAT tube to spring forward around the cowl inlet extension. Since I have a 3 blade prop the bottom cowl must be raised straight up into position. This works well for me.Albert GardnerN991RVYuma, AZ [b]
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RV-9A N872RV
RV-10 N991RV |
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Mon Jan 04, 2010 10:36 am Post subject: FAB - Filtered Air Box Intake Plenum/ interface seal |
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I'm not sure what the plans call for in the way of a seal, but The James
cowl/plenum uses neoprene cylinders to bridge the gap between the cowl
and the plenum. I also used this same method to bridge the gap between
the induction air cowl intake and the Rod Bowers Ram/Filtered air.
Seeing this thread makes e wonder if it would also work in this application.
http://deemsrv10.com/album/Final%20Assembly/slides/DSC07042.html
It's flexible enough to not interfere with the removal/install of the
lower cowl. While installation of the cowl ususllay results in a 'kink'
in the cylinder, I can reach in from the front of the cowl with my
fingers and easily get the neoprene to slip over the air canister.
Deems Davis
N519PJ
www.deemsrv10.com
Jesse Saint wrote:
| Quote: |
What some have done is leave a bigger gap and use a thicker seal material to bridge the gap. The main loss would be a little of the ram air effect on Manifold Pressure. I've heard this is mainly an issue at altitude.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Jan 3, 2010, at 8:18 PM, AirMike wrote:
>
>
> It is a real pain to install/remove the cowl with the baffle interface seal on the FAB. I know at least one RV10 builder who has eliminated the baffle seal material at the interface. In discussing this problem with another builder, I was wondering if any builder has come up with a unique solution to this problem or the technical ramifications of leaving the seal material off.
>
> --------
> OSH '10 or Bust
> Q/B - testing phase 1
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 79960#279960
>
>
>
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http://www.matronics.com/Navigator?RV10-List |
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