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  #91  
Old 11-07-2020, 09:05 AM
RobB52 RobB52 is offline
 
Join Date: Nov 2013
Location: Shreveport, LA
Posts: 64
Default 5" SCAT Installed - Little Change

I installed the 5" SCAT tube to the oil cooler using the Vans supplied parts. I saw no change in oil temps at cruise, however, slower speeds in the pattern had lower oil temps (around 195-205).

Data for todays flight (25 hours on IO-390)
OAT 53
ALT 4500 MSL
MAP 24
RPM 2400
Mixture - Full Rich
Oil Temp 212 (No change from 4" SCAT)
CHTs 325, 315, 298, 299
EGTs 1210, 1185, 1225, 1225

My frustration with high oil temp remains. Here are my takeaways at this point.

1) Oil Cooler airflow is maxed out at cruise. The 5" SCAT had zero impact to oil temps or CHT's . The 4" SCAT was providing the max airflow that could make it thru the cooler at cruise. Maybe a little lower oil temps in the pattern while doing touch and go's with the 5" SCAT, which may be worth it.

2) I have RTVed every seam, crack, hole, etc around baffles. Multiple tubes of RTV and multiple sessions. Nothing changed in oil temp although CHT's have been lowered.

3) Oil temp sensor has been verified with testing.

Something seems to be regulating the oil temp around 210 degrees at cruise power settings. In my mind either the vernatherm is not working at the proper temp or the oil cooler has restricted oil flow.

So, I need your votes on whether to replace the vernatherm or the oil cooler next?
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RV-14 Flying
EAA Chapter 343 (DTN)
Shreveport, LA
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  #92  
Old 11-07-2020, 10:07 AM
azflyer21 azflyer21 is offline
 
Join Date: Nov 2016
Location: Scottsdale AZ
Posts: 279
Default

My oil temps were very similar around 212 in cruise. Only within the past 5 hours have the temps started to normalize. I now have 68 hours, standard 390, dual Pmags.
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Kevin Lippert
RV-14A N1402 Flying 03-2020
Phase 1 Complete 07-12-2020
YouTube Channel
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Zenith 750 completed 2016 -
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  #93  
Old 11-07-2020, 04:55 PM
spacedoc spacedoc is offline
 
Join Date: Sep 2020
Location: Long Beach, CA
Posts: 6
Default

Quote:
Originally Posted by azflyer21 View Post
My oil temps were very similar around 212 in cruise. Only within the past 5 hours have the temps started to normalize. I now have 68 hours, standard 390, dual Pmags.
RobB52, I was thinking about break-in when I saw the above comment. With only 25 hours on the engine, isn't there a good possibility that it's still breaking in and the temps will fall after more time? I seem to remember reading somewhere that it's not unusual for this engine to still be breaking in up to the ~50 hr point.
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  #94  
Old 11-11-2020, 07:53 AM
RobB52 RobB52 is offline
 
Join Date: Nov 2013
Location: Shreveport, LA
Posts: 64
Default

Thanks for the comments. I am going to press on with the break in and re-address after 50 hours and changing out the mineral oil.
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Rob

RV-14 Flying
EAA Chapter 343 (DTN)
Shreveport, LA
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  #95  
Old 11-11-2020, 08:52 AM
Nova RV Nova RV is offline
 
Join Date: Aug 2015
Location: Leesburg, VA
Posts: 534
Default

Rob I wouldn't change anything just yet, definitely wait a while until the engine is broken in completely. My last flight at 9000 feet and 64% power had a steady 190 degree oil temp. I have the standard 4" tube and dual PMags and 128 hours on the engine.
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Leesburg, VA

CFI-I ASMEL, ATP

RV-14A kit # 140243 (flying as of 11/18)

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  #96  
Old 11-13-2020, 10:44 AM
hhbarton11 hhbarton11 is offline
 
Join Date: Sep 2019
Location: Townsend Ga,
Posts: 2
Default

Rob,
I to am right there with Chris, I have about 135 hours on a very standard build. I have one P-Mag and my temp's are always 185-191.

Thanks,
Heywood
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  #97  
Old 02-22-2021, 06:51 PM
RobB52 RobB52 is offline
 
Join Date: Nov 2013
Location: Shreveport, LA
Posts: 64
Default Oil Temp Lower with Wheel Pants

Y'alls advice and patience has produced good results. I finally completed my wheel pants and first flight with them was today. I gained 16 KIAS at 24 squared, 5000', and oil temp was 15 degrees lower.

45 total hours on airframe.

Speed increased from 142 KIAS to 158 KIAS and oil temps decreased from 214 to 199. OAT's were similar.

Still on mineral oil. Changed at 40 hours. I wasn't convinced oil consumption had stabilized but it appears to be holding around 6.25 quarts now.

Thanks for all the inputs.
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RV-14 Flying
EAA Chapter 343 (DTN)
Shreveport, LA
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