Today's Message Index:
----------------------
1. 07:08 AM - RV-8 Cowl Vents (japhillipsga@aol.com)
2. 10:53 AM - Re: RV-8 Cowl Vents (Matt Dralle)
3. 03:28 PM - Re: Re: RV-8 Cowl Vents (Michael Kraus)
4. 03:41 PM - Re: Re: RV-8 Cowl Vents (Robin Marks)
5. 05:01 PM - Re: Re: RV-8 Cowl Vents (japhillipsga@aol.com)
Message 1
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Dear Fellow RV-8 Builders, I now have 13 hours on my 0360 Lyc. Still having
# 1 CHT get too hot before TOC. So I have to throttle back and stairstep u
p to altitude. Temps should be stable by now with 13 hours. So I bought fro
m Avery the bottom cowl louvers to improve airflow. Talked to a couple RV-8
drivers both said the vents lowered CHTs about 20 degrees. Question is how
is best to mount? What shape and size hole(s)? The bottom of the vent pla
te is flat while the cowl bottoms have compound curve surfaces. What is bes
t for looks and effectiveness and strength? Hope to hear from someone, Bill
of Georgia N288WP
-----Original Message-----
From: RV8-List Digest Server <rv8-list@matronics.com>
Sent: Mon, Aug 8, 2011 3:07 am
Subject: RV8-List Digest: 0 Msgs - 08/07/11
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Message 2
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| Subject: | Re: RV-8 Cowl Vents |
At 07:04 AM 8/8/2011 Monday, you wrote:
>Dear Fellow RV-8 Builders, I now have 13 hours on my 0360 Lyc. Still having #
1 CHT get too hot before TOC. So I have to throttle back and stairstep up to altitude.
Temps should be stable by now with 13 hours. So I bought from Avery the
bottom cowl louvers to improve airflow. Talked to a couple RV-8 drivers both
said the vents lowered CHTs about 20 degrees. Question is how is best to mount?
What shape and size hole(s)? The bottom of the vent plate is flat while the
cowl bottoms have compound curve surfaces. What is best for looks and effectiveness
and strength? Hope to hear from someone, Bill of Georgia N288WP
Hi Bill,
I have an IO-390 210hp on my RV-8 with the standard cowling. I don't have any
trouble with CHT's (generally well under 400f) and my oil temps are generally
in the low 180'sf. If I take off on a hot day at sea level and climb hard, I
can get the CHT on the hot cylinder to go over 400 but by that time I'm at 8000
ft and simply decreasing my angle slightly will bring it back down. The only
"non-stock" aspect of my installation is the giant oil cooler I added to the
back of the baffle. Its about twice the size of the stock one.
Before you start cutting holes in your cowling, you might want to do some more
investigation into the cause of the overheating. Might be indicative of something
else. Plugged oil line to that cylinder, maybe a blocked fuel injector on
that cylinder? Try swapping the injectors between the hottest and coolest cylinder
and see what impact this has on the CHT.
Here's some info on the oil cooler installation that has worked well for me:
http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&category=2972&log=90253&row=84
Matt
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
Message 3
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| Subject: | Re: RV-8 Cowl Vents |
Bill,
Do you have the wheel pants and gear leg fairings installed? If not, I would not
make any drastic changes until you get them installed. They will speed your
plane up and provide less drag, of which you will get more airflow and less
engine work.
Sent from my iPhone
On Aug 8, 2011, at 1:47 PM, Matt Dralle <dralle@matronics.com> wrote:
>
> At 07:04 AM 8/8/2011 Monday, you wrote:
>> Dear Fellow RV-8 Builders, I now have 13 hours on my 0360 Lyc. Still having
# 1 CHT get too hot before TOC. So I have to throttle back and stairstep up to
altitude. Temps should be stable by now with 13 hours. So I bought from Avery
the bottom cowl louvers to improve airflow. Talked to a couple RV-8 drivers both
said the vents lowered CHTs about 20 degrees. Question is how is best to mount?
What shape and size hole(s)? The bottom of the vent plate is flat while
the cowl bottoms have compound curve surfaces. What is best for looks and effectiveness
and strength? Hope to hear from someone, Bill of Georgia N288WP
>
> Hi Bill,
>
> I have an IO-390 210hp on my RV-8 with the standard cowling. I don't have any
trouble with CHT's (generally well under 400f) and my oil temps are generally
in the low 180'sf. If I take off on a hot day at sea level and climb hard,
I can get the CHT on the hot cylinder to go over 400 but by that time I'm at 8000
ft and simply decreasing my angle slightly will bring it back down. The only
"non-stock" aspect of my installation is the giant oil cooler I added to the
back of the baffle. Its about twice the size of the stock one.
>
> Before you start cutting holes in your cowling, you might want to do some more
investigation into the cause of the overheating. Might be indicative of something
else. Plugged oil line to that cylinder, maybe a blocked fuel injector
on that cylinder? Try swapping the injectors between the hottest and coolest
cylinder and see what impact this has on the CHT.
>
> Here's some info on the oil cooler installation that has worked well for me:
>
> http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&category=2972&log=90253&row=84
>
> Matt
>
>
> -
> Matt Dralle
> RV-8 #82880 N998RV "Ruby Vixen"
> http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
> http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
>
>
>
>
>
Message 4
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| Subject: | Re: RV-8 Cowl Vents |
That was our experience exactly (8A) but with oil temps, our CHT's were
fine. Wheel pants & leg fairings added about 14 knots and reduced our oil
temps about 15 degrees.
Robin
Do Not Archive
On Mon, Aug 8, 2011 at 3:25 PM, Michael Kraus <n223rv@wolflakeairport.net>wrote:
>
> Bill,
>
> Do you have the wheel pants and gear leg fairings installed? If not, I
> would not make any drastic changes until you get them installed. They will
> speed your plane up and provide less drag, of which you will get more
> airflow and less engine work.
>
> Sent from my iPhone
>
> On Aug 8, 2011, at 1:47 PM, Matt Dralle <dralle@matronics.com> wrote:
>
> >
> > At 07:04 AM 8/8/2011 Monday, you wrote:
> >> Dear Fellow RV-8 Builders, I now have 13 hours on my 0360 Lyc. Still
> having # 1 CHT get too hot before TOC. So I have to throttle back and
> stairstep up to altitude. Temps should be stable by now with 13 hours. So I
> bought from Avery the bottom cowl louvers to improve airflow. Talked to a
> couple RV-8 drivers both said the vents lowered CHTs about 20 degrees.
> Question is how is best to mount? What shape and size hole(s)? The bottom
> of the vent plate is flat while the cowl bottoms have compound curve
> surfaces. What is best for looks and effectiveness and strength? Hope to
> hear from someone, Bill of Georgia N288WP
> >
> > Hi Bill,
> >
> > I have an IO-390 210hp on my RV-8 with the standard cowling. I don't
> have any trouble with CHT's (generally well under 400f) and my oil temps are
> generally in the low 180'sf. If I take off on a hot day at sea level and
> climb hard, I can get the CHT on the hot cylinder to go over 400 but by that
> time I'm at 8000 ft and simply decreasing my angle slightly will bring it
> back down. The only "non-stock" aspect of my installation is the giant oil
> cooler I added to the back of the baffle. Its about twice the size of the
> stock one.
> >
> > Before you start cutting holes in your cowling, you might want to do some
> more investigation into the cause of the overheating. Might be indicative
> of something else. Plugged oil line to that cylinder, maybe a blocked fuel
> injector on that cylinder? Try swapping the injectors between the hottest
> and coolest cylinder and see what impact this has on the CHT.
> >
> > Here's some info on the oil cooler installation that has worked well for
> me:
> >
> >
> http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&category=2972&log=90253&row=84
> >
> > Matt
> >
> >
> > -
> > Matt Dralle
> > RV-8 #82880 N998RV "Ruby Vixen"
> > http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
> > http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
> > http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> > Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
> >
> >
> >
> >
> >
>
>
Message 5
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| Subject: | Re: RV-8 Cowl Vents |
Thanks fellows, the engine is new and only has 13 hours on it. I am still
working on the damned intersections and pants, etc. I appreciate the advise
not to install the louver vents until I see how she does with the undercar
riage clean, Makes good sense, Bill
-----Original Message-----
From: Robin Marks <robin@PaintTheWeb.com>
Sent: Mon, Aug 8, 2011 6:42 pm
Subject: Re: RV8-List: Re: RV-8 Cowl Vents
That was our experience exactly (8A) but with oil temps, our CHT's were fin
e. Wheel pants & leg fairings added about 14 knots and reduced our oil temp
s about 15 degrees.
Robin
Do Not Archive
On Mon, Aug 8, 2011 at 3:25 PM, Michael Kraus <n223rv@wolflakeairport.net>
wrote:
Bill,
Do you have the wheel pants and gear leg fairings installed? If not, I wou
ld not make any drastic changes until you get them installed. They will sp
eed your plane up and provide less drag, of which you will get more airflow
and less engine work.
Sent from my iPhone
On Aug 8, 2011, at 1:47 PM, Matt Dralle <dralle@matronics.com> wrote:
>
> At 07:04 AM 8/8/2011 Monday, you wrote:
>> Dear Fellow RV-8 Builders, I now have 13 hours on my 0360 Lyc. Still hav
ing # 1 CHT get too hot before TOC. So I have to throttle back and stairste
p up to altitude. Temps should be stable by now with 13 hours. So I bought
from Avery the bottom cowl louvers to improve airflow. Talked to a couple R
V-8 drivers both said the vents lowered CHTs about 20 degrees. Question is
how is best to mount? What shape and size hole(s)? The bottom of the vent
plate is flat while the cowl bottoms have compound curve surfaces. What is
best for looks and effectiveness and strength? Hope to hear from someone, B
ill of Georgia N288WP
>
> Hi Bill,
>
> I have an IO-390 210hp on my RV-8 with the standard cowling. I don't hav
e any trouble with CHT's (generally well under 400f) and my oil temps are g
enerally in the low 180'sf. If I take off on a hot day at sea level and cl
imb hard, I can get the CHT on the hot cylinder to go over 400 but by that
time I'm at 8000 ft and simply decreasing my angle slightly will bring it b
ack down. The only "non-stock" aspect of my installation is the giant oil
cooler I added to the back of the baffle. Its about twice the size of the
stock one.
>
> Before you start cutting holes in your cowling, you might want to do some
more investigation into the cause of the overheating. Might be indicative
of something else. Plugged oil line to that cylinder, maybe a blocked fue
l injector on that cylinder? Try swapping the injectors between the hottes
t and coolest cylinder and see what impact this has on the CHT.
>
> Here's some info on the oil cooler installation that has worked well for
me:
>
> http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&proj
ect=638&category=2972&log=90253&row=84
>
> Matt
>
>
> -
> Matt Dralle
> RV-8 #82880 N998RV "Ruby Vixen"
> http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
> http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
>
>
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