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jcumins(at)jcis.net
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 Posted: Mon Sep 28, 2009 2:51 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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Linn
I think you are in the right direction. I would like to see some smoke test
on the cooling air. And really see how the air flows thru the cowl. How
much circles back out the front of the cowl and how much goes thru the
cylinders. It is amazing how much air really comes right back out the
front of the engine and not go thru the cylinders or to the oil coolers. I
bet that if someone could rig a small camera and a smoke tube and then
record the results I bet we would surprised allot.
What do you think Tim.
Also the inlet opening has a lot to do with it also, that's why the round
openings are so affective in getting the press diff up where it needs to be,
it is basically the venturi affect thru the round openings that does that.
It majorly speeds up the air as it passes thru the opening of the cowls.
Anyone have more thoughts on this.
John G. Cumins
President
JC'S Interactive Systems
2499 B1 Martin Rd
Fairfield Ca 94533
707-425-7100
707-425-7576 Fax
Your Total Technology Solution Provider
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rbibb
Joined: 16 Jul 2009
Posts: 37
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| Posted: Mon Sep 28, 2009 3:05 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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I'm thinking a separate input scoop (not a NACA Vent as they suck at
pressure recovery) feeding a dedicated plenum/duct for the oil cooler with a
dedicated out put duct leading to the exit area of the cowl is what way to
go. At least as far as the oil cooler goes. A P-51 style scoop - that was
why I was suggesting a dual role scoop. Maybe the oil cooler input scoop
needs to be one the side. We need a wind tunnel!
I'm thinking the inlet are the place to start on the cylinder cooling. Of
course the oil has a lot to do with the overall cooling on these engines as
a lot of heat gets carried off to the cooler...
Richard Bibb
972-771-2598
972-835-5979 mobile
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Tim Olson
Joined: 25 Jan 2007
Posts: 2882
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| Posted: Mon Sep 28, 2009 3:18 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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What do I think?  . I think if you're gonna fix a problem, you should
have someone WITH the problem do the fixing. I'm happy how it is.
Tim
On Sep 28, 2009, at 5:52 PM, "John Cumins" <jcumins(at)jcis.net> wrote:
[quote]
Linn
I think you are in the right direction. I would like to see some
smoke test
on the cooling air. And really see how the air flows thru the
cowl. How
much circles back out the front of the cowl and how much goes thru the
cylinders. It is amazing how much air really comes right back out
the
front of the engine and not go thru the cylinders or to the oil
coolers. I
bet that if someone could rig a small camera and a smoke tube and then
record the results I bet we would surprised allot.
What do you think Tim.
Also the inlet opening has a lot to do with it also, that's why the
round
openings are so affective in getting the press diff up where it
needs to be,
it is basically the venturi affect thru the round openings that does
that.
It majorly speeds up the air as it passes thru the opening of the
cowls.
Anyone have more thoughts on this.
John G. Cumins
President
JC'S Interactive Systems
2499 B1 Martin Rd
Fairfield Ca 94533
707-425-7100
707-425-7576 Fax
Your Total Technology Solution Provider
--
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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jcumins(at)jcis.net
Guest
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| Posted: Mon Sep 28, 2009 3:22 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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Deems
Did the new louvers work on the cowl. How much did you see of a difference
in cooling numbers?
John G. Cumins
President
JC'S Interactive Systems
2499 B1 Martin Rd
Fairfield Ca 94533
707-425-7100
707-425-7576 Fax
Your Total Technology Solution Provider
--
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Mon Sep 28, 2009 3:50 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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It's hard to say, I put several sets of louvers on the bottom of the cowl :
http://deemsrv10.com/album/Phase1/slides/DSC07560.html
http://deemsrv10.com/album/Phase1/slides/DSC07583.html
With differences in OAT on the before and after days. The benefit, if
any was small (i.e. a couple of degrees and not 10-15 degs). Bill Genero
(at) Airflow systems, says that the optimum place to install them is on the
sides of the lower cowl. Since That would interferre with my paint, i
was reluctant to do that.
Deems
John Cumins wrote:
[quote]
Deems
Did the new louvers work on the cowl. How much did you see of a difference
in cooling numbers?
John G. Cumins
President
JC'S Interactive Systems
2499 B1 Martin Rd
Fairfield Ca 94533
707-425-7100
707-425-7576 Fax
Your Total Technology Solution Provider
--
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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billderou(at)yahoo.com
Guest
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| Posted: Tue Sep 29, 2009 7:05 am Post subject: Ram Air Oil Cooler Inlet - input requested |
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Deems-
My engine and installation is entirely stock. From not too many samples my CHT's run around OAT (in F) + 300F. My oil temps vary between 180 and 195 also depending upon OAT.
I would guess that your temps are about 5%-10% over a stock installation. I currently have 315 hours on N939SB and my CHT temps did not settle down until 100 hours minimum.
Bill DeRouchey
N939SB
--- On Mon, 9/28/09, Deems Davis <deemsdavis(at)cox.net> wrote:
[quote]
From: Deems Davis <deemsdavis(at)cox.net>
Subject: Re: Ram Air Oil Cooler Inlet - input requested
To: rv10-list(at)matronics.com
Date: Monday, September 28, 2009, 4:49 PM
--> RV10-List message posted by: Deems Davis <deemsdavis(at)cox.net (deemsdavis(at)cox.net)>
It's hard to say, I put several sets of louvers on the bottom of the cowl :
http://deemsrv10.com/album/Phase1/slides/DSC07560.html
http://deemsrv10.com/album/Phase1/slides/DSC07583.html
With differences in OAT on the before and after days. The benefit, if
any was small (i.e. a couple of degrees and not 10-15 degs). Bill Genero
(at) Airflow systems, says that the optimum place to install them is on the
sides of the lower cowl. Since That would interferre with my paint, i
was reluctant to do that.
Deems
John Cumins wrote:
[quote] --> RV10-List message posted by: "John Cumins" <jcumins(at)jcis.net (jcumins(at)jcis.net)>
Deems
Did the new louvers work on the cowl. How much did you see of a difference
in cooling numbers?
John G. Cumins
President
JC'S Interactive Systems
2499 B1 Martin Rd
Fairfield Ca 94533
707-425-7100
707-425-7576 Fax
Your Total Technology Solution Provider
--
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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kevino(at)WorldWarehouse.
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| Posted: Tue Sep 29, 2009 9:21 am Post subject: Ram Air Oil Cooler Inlet - input requested |
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Attaching a pic of my louvers. One on each side. Have 15 hrs on ac with new IO 540. After first 5 hrs CHT's have settled down to 350-380. Oil temps have never exceeded 190. Stock Van's cowl, cooler etc. In Vt so oat not like the southwest. Max temp flown 85. I believe the louver is a key variable. Built a Glastar with O360 with cooler on firewall. had a horrible time with oil temps and had to move cooler to front baffle. Did not use a louver but felt that could make a big difference which I think has been the case with the RV 10. The 10 is a great airplane.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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bkbrown(at)minetfiber.com
Guest
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| Posted: Tue Sep 29, 2009 1:47 pm Post subject: Ram Air Oil Cooler Inlet - input requested |
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Kevin, what engine do you have? Is it stock IO-540 or “built” w 9:1’s, electronic ignition, etc?
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Kevin O'Shea
Sent: Tuesday, September 29, 2009 10:19 AM
To: rv10-list(at)matronics.com
Subject: Re: Ram Air Oil Cooler Inlet - input requested
Attaching a pic of my louvers. One on each side. Have 15 hrs on ac with new IO 540. After first 5 hrs CHT's have settled down to 350-380. Oil temps have never exceeded 190. Stock Van's cowl, cooler etc. In Vt so oat not like the southwest. Max temp flown 85. I believe the louver is a key variable. Built a Glastar with O360 with cooler on firewall. had a horrible time with oil temps and had to move cooler to front baffle. Did not use a louver but felt that could make a big difference which I think has been the case with the RV 10. The 10 is a great airplane.
[quote][b]
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