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High oil temps
Just to add my experience with high oil temps, my motor is an IO320 eci kit engine with squirters rv7a. I have been chasing hi temps since the build now with 140 hrs on the clock . Temps up to 118c and rarely under 102c , chts ok.basically unmanageable
Relieved lower cowl with no change to temps, fitted 13 row remote cooler helped but still to high. When I built the motor I never adjusted the oil pressure relief valve as it was screwed up to maximum so I figured that wasn't a bad thing. By chance I just fitted a c/s prop and was having surge problems and I deceided to adjust the oil pressure. Oil temps down to 86c constantly . We have been flying with summer temps in the 35c plus range and I have seen 108c on climb then start managing it with air speed and decreasing into the mid 90c . I guess it was not getting oil cooler saturation. I'm happy with these figures . I hope this may help . |
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hmm. My oil pressure is at 90-95 in cruise I believe.
I took my leaf blower up and blew it into the cowling then stuck my hand behind the cooler. It doesn't feel like much air is getting through it with the 3" scat. The 7 row will be here today and I'll see what difference that makes before I fab up a new fiberglass plenum and the 4" scat. |
Oil cooler
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Not sure I've ever seen a screen on any aircraft for an oil cooler. If I took a bird and saw the temps rise, I would be landing to check out what was going on, but point taken. Checked, nothing is obscuring it.
I got the 7 row in tonight in series and it lowered temps to 200. I can live with that to get it down to SNF until I can get the 4" scat on the 9 row. I think I may be putting in the ramps as well once I get back. Something still isn't right as far as flow in the cowl because despite the change, the #4 is still at 295 on the CHT after leveling off with the others 336-345. I think something needs to be done to ensure the air is flowing all the way to the back and getting through the coolers. |
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https://www.mcmaster.com/#standard-m...lters/=171kr9k Quote:
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back to the basics. I like it. I'll check tomorrow
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Oil temp sucsess
Dan , the pressure was 75 psi on cruise now it's around 65 psi ,its quite amazing I think that it's been such a dramatic improvement on my oil cooling , one would think that fitting a 13 row cooler over a 7 row would do the job but the pressure adjustment has done the job.
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lower pressure = lower oil temp
Can someone explain why this would be as it seems counter intuitive.
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By lowering the oil pressure, I believe you give the oil more time in the cooler, to transfer its heat to the moving mass of air. |
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