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It's hard to compare apples to apples from every test fight, but yeah. The PSRU used to be 5degrees hotter from the oil inlet. Now I'm 5 degrees colder from the oil pan temperatures. About a 15F increase. I have lots of testing to do, trying to fly in the mornings when it's cool and not so humid/hot out. The oil rad cools about 20F-25F worth.
Depending on engine load, rpm with the electric prop and super charger I would average an 18F oil temperature increase across the PSRU. If I understand correctly
you are seeing a 15F increase?
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, June 04, 2021 8:09 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] PSRU temps
Does anyone measure their PSRU temperature? So this is weird, usually it would only be about 2-5degrees hotter than the inlet oil temperature. That was in Oct. I started to fly again in May and really the only thing I've done is switched
to synthetic 20W-50, and my psru temps are 5degrees colder than the oil pan temperature now. Either the outside temperature of Florida, or synthetic , I have no clue what's going on. Took it apart ahead, don't see any obvious going on.
195 Oil inlet
Side note, I did upgrade my oil cooler last week about 40% fin area, to a Setrab 34 row. Depending how you measure the 'core'. It dropped the overall temps about 10F, while taking off in 100F weather.
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