Today's Message Index:
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1. 06:27 AM - Re: Air box mod to fix filter deformation (Denis Walsh)
2. 09:07 AM - Re: Air box mod to fix filter deformation (William Dean)
Message 1
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| Subject: | Re: Air box mod to fix filter deformation |
An excellent post. I would like to add a few comments. =46rom the
pictures, it appears to be the same as for my carburetor Lyc 180 HP, in
my RV-6A. I would highly recommend that all who have the O-360 air box
do this modification, and also replace the filter when it no longer
fills up the air box space, just as you did.
My experience with the K&N filter and air box on my 180 HP O-360A1A was
very similar. While mine did not curve, it definitely shrank, which
presented the same problem. the vertical shrinkage caused a "failure to
seal" at the top. The diameter also shrank. The combination of the
two caused the filter element to have a lot of rattle space within the
air box enclosure.
As the years went by, i noticed the bottom of the fiberglass box was
showing a lot of wear, and the filter element was apparently shrinking!
It seemed to rattle around in the box a little more, each time I opened
it up for its 100 hr cleaning and re oiling.
My first action was to install a bottom plate, which looks just like
yours, although i used a heavier thickness. It helped seal the top and
bottom but did not help the "shrinking radius" problem. Nonetheless I
did notice a reduction in the silica amount on my next oil analysis.
Later on, I noted the shrinkage problem as such and replaced the filter
with a new one.
At this point I was able to hold the new filter next to the new one and
verified it had indeed shrunk in all dimensions! Strange but true.
I wish I could give you a time estimate on how long between filter
changes but I can't. This type thing I just replace on condition. I
believe I am on my third filter at 2,830 hours. So I would guess they
lasted around a thousand hours each. I will note that they were in
great condition otherwise. Those things will last forever, if you clean
them gently.
It may well be unrelated that my air box is sealed like yours, and the
fact that my engine is still purring at 2,830 tack hours, but on the
other hand it may have helped?
D Walsh, RV 6A, flying for 15.5 years.
On 3Nov, 2012, at 4:18 , Carl Froehlich <carl.froehlich@verizon.net>
wrote:
> All,
>
> This is a mod to the air box I did on the RV-10, and just now back
fitted onto the RV-8A.
>
> Over the years with the RV-8A I=92ve had to repair the air box and
replace the filter. As you can see from the first photo, the bottom of
the filter deforms (curves in). This tends to shorten the filter such
that it drops out of the top and impairs the seal with the top plate. I
also had to add fiberglass to the bottom of the air box as the relative
motion between the bottom of the air filter the air box eroded away the
fiberglass bottom.
>
> The fix was to add a .032=94 aluminum plate to the bottom of the air
box. The plate eliminates the bottom erosion and the added brackets
hold the filter shape. A side benefit is that alternate air door now
sandwiches the bottom fiberglass between two piece of metal making a
sturdier install. I also took the step to add proseal between the
aluminum plate and the air box bottom.
>
> Carl
> <Airbox mod #1.jpg><Airbox mod #2 10-30-12.jpg><Airbox mod #3.jpg>
Message 2
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| Subject: | Re: Air box mod to fix filter deformation |
Please remove billoves2fly@yahoo.com from your email list.=C2- He passed
away on October 29, 2012.=C2- =0A=C2-=0AThank you. =0A=C2-=0AThe Dean
Family=0A=0A=0A=0A________________________________=0AFrom: Denis Walsh <de
nis.walsh@comcast.net>=0ATo: rv-list@matronics.com =0ASent: Sunday, Novembe
r 4, 2012 8:26 AM=0ASubject: Re: RV-List: Air box mod to fix filter deforma
tion=0A=0A=0AAn excellent post. =C2-I would like to add a few comments.
=C2-From the pictures, it appears to be the same as for my carburetor Lyc
=C2-180 HP, in my RV-6A. =C2-I would highly recommend that all who hav
e the O-360 =C2-air box do this modification, and also replace the filter
when it no longer fills up the air box space, just as you did. =0A=0AMy ex
perience with the K&N filter and air box on my 180 HP O-360A1A was very sim
ilar. While mine did not curve, it definitely shrank, which presented the s
ame problem. =C2-the vertical shrinkage caused a "failure to seal" at the
top. =C2-The diameter also shrank. =C2-The =C2-combination of the tw
o caused the filter element to have a lot of rattle space within the air bo
x enclosure.=0A=0A=0AAs the years went by, i noticed the bottom of the fibe
rglass box was showing a lot of wear, and the filter element was apparently
shrinking! =C2-It seemed to rattle around in the box a little more, each
time I opened it up for its 100 hr cleaning and re oiling.=0A=0AMy first a
ction was to install=C2-=C2-a bottom plate, =C2-which looks just like
yours, although i used a heavier thickness. =C2-It helped seal the =C2
-top and bottom but did not help the "shrinking radius" problem. =C2-No
netheless I did notice a reduction in the silica amount on my next oil anal
ysis. =0A=0ALater on, I noted the shrinkage problem as such and replaced th
e filter with a new one.=0A=0AAt this point I was able to hold the new filt
er next to the new one and verified it had indeed shrunk in all dimensions!
=C2-Strange but true.=0A=0AI wish I could give you a time estimate on ho
w long between filter changes but I can't. =C2-This type thing I just rep
lace on condition. =C2-I believe I am on my third filter at 2,830 hours.
=C2-So I would guess they lasted around a thousand hours each. =C2-I wi
ll note that they were in great condition otherwise. =C2-Those things wil
l last forever, if you clean them gently. =C2-=0A=0AIt may well be unrela
ted that my air box is sealed like yours, and the fact that my engine is st
ill purring at 2,830 tack hours, but on the other hand it may have helped?
=0A=0A=0A=0A=0A=0AD Walsh, RV 6A, =C2-flying for 15.5 years.=0A=0A=0A=0A
=0AOn 3Nov, 2012, at 4:18 , Carl Froehlich <carl.froehlich@verizon.net> wro
te:=0A=0AAll,=0A>=C2-=0A>This is a mod to the air box I did on the RV-10,
and just now back fitted onto the RV-8A.=0A>=C2-=0A>Over the years with
the RV-8A I=99ve had to repair the air box and replace the filter.=C2
- As you can see from the first photo, the bottom of the filter deforms (
curves in).=C2- This tends to shorten the filter such that it drops out o
f the top and impairs the seal with the top plate.=C2- I also had to add
fiberglass to the bottom of the air box as the relative motion between the
bottom of the air filter the air box eroded away the fiberglass bottom.=0A>
=C2-=0A>The fix was to add a .032=9D aluminum plate to the bottom o
f the air box. =C2-The plate eliminates the bottom erosion and the added
brackets hold the filter shape.=C2- A side benefit is that alternate air
door now sandwiches the bottom fiberglass between two piece of metal making
a sturdier install.=C2- I also took the step to add proseal between the
aluminum plate and the air box bottom.=0A>=C2-=0A>Carl<Airbox mod #1.jpg>
ive Search
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