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Old 06-16-2018, 06:13 PM
jpowell13 jpowell13 is offline
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 606
Default Point of reference

Just as a point of reference with an oil cooler at the left inlet. I flew across Texas today from east to west. Started at 4500' and was cruising at 8500' by the time i reached Lubbock. Temps on the ground were in the high 80's and 60 to 70 plus at altitude. I was running at 2300 rpm/130 knots. My oil temps were about 183 most of the time. CHT at cruise was about 370 on the 3 cylinder which tends to run hottest on my engine. I have an 0320.

Should see some much higher temps in AZ next few days. Will let you know the effects on oil temp.


Last edited by jpowell13 : 06-16-2018 at 06:16 PM.
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Old 06-16-2018, 06:52 PM
boulderick boulderick is offline
Join Date: Dec 2017
Location: Boulder, Colorado
Posts: 11

Originally Posted by rvbuilder2002 View Post
Good plan, but there are numerous things that are needed that wouldn't be an experiement/change, they are a given because your baffle installation is not even up to the typical standard installation.

As already mentioned, the seals totally missing on the fwd dam are a major error.

Another backwards seals for the inlet ramps. With them attached to the ramps they are probably not doing much in regards to sealing.
All of the inlet seals should be attached to the cowl and lap onto the inlet part of the baffling so that dynamic pressure pushes/seals them against the baffles.
In your case, dynamic pressure like pushes them away from the cowl.

Considering these major flaws in the installation, there are likely more that could be seen if you posted more photos of the entire installation.
Thanks, Scott. I'll switch the seals from the ramps to the cowl as part of the first set of modifications.
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Old 06-24-2018, 05:00 PM
jpowell13 jpowell13 is offline
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 606
Default Another comment

Made it back from AZ Friday. Mercifully, ground temps only got to about 90 degrees this year. The highest oil temp I saw was 192 with an OAT of 74 at 7500'. My MP was 19.7 inches and I was near gross. My cowl flap was closed.

I would rate my baffle/caulking job as average for RV's. I believe my oil cooler is a 7 row Positech. Not sure how this compares to other 6A's with 0320 engines with oil coolers at the air inlet. I've never flown my plane without the air scoop for the oil cooler, so don't know whether it really helps or not, but after tightening up your baffles if you still have high OT's, it might be worth a try.

I also got a good test of my new Anti-splat cowl flap on this trip. If I opened it in cruise it seemed to drop my CHT's by about 3-5 degrees. For me that's well worth the time and cost. I only saw 400+ degrees once during my trip, and was able to get the CHT's down easily with the cowl flap opened by dropping the nose slightly and enriching the mixture a little.

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Old 06-29-2018, 07:22 AM
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smokyray smokyray is offline
Join Date: Jan 2005
Location: TX32
Posts: 1,795
Default Cool it...

I mounted my RV4's oil cooler in the exact same spot. After several iterations it was the optimum cooling for SE USA heat and humidity. 190 in summer, 175-180 in winter.

22 years later it's still flying and cooling well...
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