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10-08-2013, 01:31 PM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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Louvers needed or not?
Hello,
I'm in the proces of installing the cowling. Now the question pops up, if louvers are needed or not?
I live in switzerland, so in the winter it is cold, in summer it can go up to 85-100? fahrenheit.
It is a RV-7A with IO-320
For sure it will be easy to do it now, before painting. But I only will do it when it looks neccesary.
Thanks for any input!
__________________
Dominik
RV-7A, TMX-IO-320, FM-150, Sensenich FP
Flying since 28. April 2016
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10-08-2013, 01:46 PM
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Join Date: Jun 2005
Posts: 3,275
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You won't know until you fly.
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10-08-2013, 01:53 PM
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Join Date: Mar 2009
Location: Sydney, Australia
Posts: 617
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Hi Dominik
I live in Sydney Australia and have an IO-360 in my RV7, I have difficulty getting the oil temperatures high enough in winter (it does not get cold here so to speak) and have blocked off 3/4 of my oil cooler, which is mounted on the rear of the plenum.
It is spring here at the moment, temps around 27C and I still have my oil cooler blocked off and temps are just getting into the 170F range.
So I would hold off on the louvers.
Cheers
__________________
Eddie Seve
Sydney Australia
First Flight 16th July 2012
RV-7 Phase 2, 30 Oct 2012
1100 hrs Feb 2020
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10-08-2013, 02:16 PM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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I live in Minnesota USA, which has a similar temperature range. I found that if anything, I have too much cooling for my IO-360. I was very careful to fit the baffles tightly, and to seal gaps with high-temp RTV to prevent air from leaking around the baffles instead of going through either the cylinder cooling fins or the oil cooler.
I'd be surprised if you need louvers; I'd build it and test fly first. If you have cooling issues, louvers are easy to add afterwards.
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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10-08-2013, 03:48 PM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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Oil cooler shutter
Hello Eddi and others
Thanks so far for this information!
This bring me to the point, that I testfly first and if neccecary install them later.
To bring oiltemps up, I install a Oil Cooler Shutter from Vans.
http://vansaircraft.com/cgi-bin/stor...ct=oil_shutter
and hope I can controll the temp as needet.
__________________
Dominik
RV-7A, TMX-IO-320, FM-150, Sensenich FP
Flying since 28. April 2016
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10-08-2013, 03:54 PM
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Join Date: Feb 2006
Location: Eliot, Maine
Posts: 83
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I live in Maine with similar weather. RV8A with o-360-A1A and the oil cooler shutter works well to fine tune cooling in winter and summer. No louvers.
__________________
Claudio Scremin
N221Z RV8A Maine 600+ hrs
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10-08-2013, 04:05 PM
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Join Date: Jan 2005
Location: England
Posts: 1,087
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Hi Dominik,
I have a 6A with an O-320 and suffered from high CHTs until I added louvres. I believe the outlet hole is too small, so there is not sufficient airflow through the cowling. The louvres dropped my CHTs by at least 40F, so much so that for this winter I think I will block half off with speed tape. The oil temperature also came down slightly, but has never really been an issue.
My view is that, yes, louvres are required, especially for a nose dragger.
Pete
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10-08-2013, 05:30 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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If you need to add louvers, you have another issue. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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10-08-2013, 08:02 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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You need the oil cooler louvers (or something else to simulate it such as a removable plate or aluminum tape)
Oil cooler louver kit from Vans
You do not need the cowl louvers like shown in the picture below

__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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10-08-2013, 08:19 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,219
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I have a 160 HP 0-320 (carbureted). I don't think you'll need louvers unless something is way out of sorts elsewhere.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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