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  #11  
Old 05-29-2015, 10:48 PM
vgb vgb is offline
 
Join Date: Aug 2007
Location: northern Cal
Posts: 111
Smile 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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  #12  
Old 06-03-2015, 07:24 AM
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BobCollins(AA) BobCollins(AA) is offline
 
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.
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  #13  
Old 06-06-2015, 05:24 PM
Cervelott Cervelott is offline
 
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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  #14  
Old 06-14-2015, 02:05 PM
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BobCollins(AA) BobCollins(AA) is offline
 
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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.
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  #15  
Old 06-14-2015, 02:25 PM
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AltonD AltonD is offline
 
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Location: Dothan, Alabama
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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?
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  #16  
Old 06-14-2015, 04:48 PM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by BobCollins(AA) View Post
After installing two anti splat electric cowl flaps I finally manage to reduce the CHT by 30 degrees and the oil temp by 15degrees.
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!
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  #17  
Old 11-15-2015, 09:26 AM
Selma Selma is offline
 
Join Date: Oct 2010
Location: Berlin, Germany
Posts: 46
Default 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 ?
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Last edited by Selma : 11-15-2015 at 09:30 AM.
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  #18  
Old 11-16-2015, 09:30 AM
krw5927 krw5927 is offline
 
Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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Quote:
Originally Posted by Selma View Post
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 ?
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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  #19  
Old 11-17-2015, 04:19 PM
Smilin' Jack Smilin' Jack is offline
 
Join Date: Jan 2011
Location: Cumming, Georgia
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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
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Last edited by Smilin' Jack : 11-17-2015 at 04:21 PM.
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  #20  
Old 11-23-2015, 03:56 AM
Selma Selma is offline
 
Join Date: Oct 2010
Location: Berlin, Germany
Posts: 46
Cool flying RV9a

Quote:
Originally Posted by krw5927 View Post
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,
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.
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