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05-29-2015, 10:48 PM
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Join Date: Aug 2007
Location: northern Cal
Posts: 111
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cooling
I always had high oil temps and cylinder temps on my RV7A. Changed to a better cooler to help oil temps. Still had high cylinder temps. I installed one antisplat cowl flap and I keep the temps down on climb and level off and shut the cowl flap. It has worked great for me. Its harder to cool things down after a climb. My 2 cents worth
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06-03-2015, 07:24 AM
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Join Date: Oct 2011
Location: Mukilteo, WA
Posts: 133
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Today I am getting two EZ Cowls that I will install on the airplane and I will post the results after my next flight.
__________________
Bob Collins
ATP, CFI, CFII/MEI
RV-7A (sold)
Now Flying P337
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06-06-2015, 05:24 PM
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Join Date: Nov 2014
Location: Ontario, Canada
Posts: 53
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Can't wait to hear how it works out Bob.
How are you going to determine the optimum placement of the flaps?
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06-14-2015, 02:05 PM
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Join Date: Oct 2011
Location: Mukilteo, WA
Posts: 133
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After installing two anti splat electric cowl flaps I finally manage to reduce the CHT by 30 degrees and the oil temp by 15degrees.
__________________
Bob Collins
ATP, CFI, CFII/MEI
RV-7A (sold)
Now Flying P337
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06-14-2015, 02:25 PM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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All the reading I have done has the best FW mounted oil cooler installation with 4" scat.
Is your cooler mounted vertical or horizontal? If vertical, the inlet should be at the bottom.
The ramps on the cowling inlet, are the ends sealed up such that they cannot be a bypass source?
__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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06-14-2015, 04:48 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by BobCollins(AA)
After installing two anti splat electric cowl flaps I finally manage to reduce the CHT by 30 degrees and the oil temp by 15degrees.
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Great to hear your issue is resolved. With timing advance, and piston jets, this is probably a lower cost way to go as opposed to wrestling with a new cooler installation!
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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11-15-2015, 09:26 AM
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Join Date: Oct 2010
Location: Berlin, Germany
Posts: 46
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CHT high - Oil temp low
seems to be different flying either an injected or a carbureted engine, is it?
Since the installation of a G3X Touch panel in our flying RV 9a O320 FP we can see all these phantastic numbers as CHTs a.s.o. We didn't know before that CHTs on this engine are pretty high in climb (450 F) and during high speed cruise (400+). Only the oiltemp remains low (160-180 F) in the cruise as it did before. Louvers or EZ cowl flaps from AntiSplat would lower CHTs what would be appreciated. But this way oil temps probably would be lower as well, what is contrary to what is beeing needed.
Any ideas ?
__________________
Pit
flying RV9a 
a father & son project
Last edited by Selma : 11-15-2015 at 09:30 AM.
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11-16-2015, 09:30 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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Quote:
Originally Posted by Selma
seems to be different flying either an injected or a carbureted engine, is it?
Since the installation of a G3X Touch panel in our flying RV 9a O320 FP we can see all these phantastic numbers as CHTs a.s.o. We didn't know before that CHTs on this engine are pretty high in climb (450 F) and during high speed cruise (400+). Only the oiltemp remains low (160-180 F) in the cruise as it did before. Louvers or EZ cowl flaps from AntiSplat would lower CHTs what would be appreciated. But this way oil temps probably would be lower as well, what is contrary to what is beeing needed.
Any ideas ?
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Add the cowl flaps or improve your baffles to lower CHTs. Then use aluminum tape to cover part of your oil cooler. In summer my oil cooler is 1/3 blocked. In winter I will probably need to block more of it.
__________________
Kurt W.
RV9A
FLYING!!!
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11-17-2015, 04:19 PM
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Join Date: Jan 2011
Location: Cumming, Georgia
Posts: 873
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Bob,
I am glad to hear the cowl flaps work well. I thought you would be pleased. Just had a nice trip to Kitty Hawk... and had a blessing on the wind last Friday 55 kts directly on the tail... and behold... on the return Sunday I had no wind. Same day Friday the 13. that Cirrus deployed his chute in North Carolina after an engine failure, what the pilot said. He is from PDK. so I will find out what happen. They had a video of it after it was on the ground and the chute inflated again and flipped it over on its back.... you can Google it.
It sure was nice to see a speed of 258 on the GS.
Jack
__________________
Smilin' Jack & Anita Hunt
N507H RV7, KJZP Jasper, GA
EAA690
APRS/ WB4JKY
Retired Corporate Pilot CFI-AI, MEL
CE500, LRJT, HS25, C650, SBJT, CL60
Hunt Aviation, LLC.
Pilot Service, IPC's Biennials.
Comm Glider
Last edited by Smilin' Jack : 11-17-2015 at 04:21 PM.
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11-23-2015, 03:56 AM
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Join Date: Oct 2010
Location: Berlin, Germany
Posts: 46
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flying RV9a
Quote:
Originally Posted by krw5927
Add the cowl flaps or improve your baffles to lower CHTs. Then use aluminum tape to cover part of your oil cooler. In summer my oil cooler is 1/3 blocked. In winter I will probably need to block more of it.
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Kurt,
thanks, baffle seals are redone, no leaks, even the washer at the baffle behind cyl.3 was installed which remarkably lowered the #3s CHT. Now #2 is the hottest. Van's oil shutter is a handy device which is easily beeing added and controlled from the panel.
If we are flying 75% on a hot day we will get 400+ CHT on #1,2 & 3. But who would like to fly the cruise whith opened cowl flaps? Thats the problem. 
__________________
Pit
flying RV9a 
a father & son project
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