rjcthree
Well Known Member
I'm having oil temperature issues with the rising ambients in NE Ohio. Last year I managed it as I was just starting phase 1 on a new OH engine, but as I step almost out of phase 1, I'm still running a little higher than comfortable. Maybe it's broken in, maybe not, but there's room for improvement regardless.
Setup: 9A, 320 H2AD, AC 9 row 800074 fed from screened-inlet 3" SCAT from above/behind #4. AS 15W50. Low oil consumption. Good transition from SCAT to cooler face. Maybe a little restricted on cooler outlet via semi-open ductwork to center exit, to be relooked at. 75% power, 8000ft DA, just ROP, 68F OAT, 215F oil temp. Stock cowl outlet. CHT in 350F-360F range. Temp sensor is in range. I can see the vernatherm closing in the data (everything else steady state, the OT data has one rate of change below 175F, it pauses at ~175F for 30 sec or so, then resumes upward at a lower rate of change, distinct and repeatable in the data).
The single question I have at the moment is regarding screening the inlet to the SCAT/cooler. At this moment, the 3" inlet has a glorified window screen across it. Has anyone quantified the air pressure differential to the cooler with and without the screen?
When running baffle mounted coolers, I usually don't see screens. I will also be looking at a rolled edge to the SCAT, right now it's just squared off. Removing the screen is a easy task.
Thanks.
Setup: 9A, 320 H2AD, AC 9 row 800074 fed from screened-inlet 3" SCAT from above/behind #4. AS 15W50. Low oil consumption. Good transition from SCAT to cooler face. Maybe a little restricted on cooler outlet via semi-open ductwork to center exit, to be relooked at. 75% power, 8000ft DA, just ROP, 68F OAT, 215F oil temp. Stock cowl outlet. CHT in 350F-360F range. Temp sensor is in range. I can see the vernatherm closing in the data (everything else steady state, the OT data has one rate of change below 175F, it pauses at ~175F for 30 sec or so, then resumes upward at a lower rate of change, distinct and repeatable in the data).
The single question I have at the moment is regarding screening the inlet to the SCAT/cooler. At this moment, the 3" inlet has a glorified window screen across it. Has anyone quantified the air pressure differential to the cooler with and without the screen?
When running baffle mounted coolers, I usually don't see screens. I will also be looking at a rolled edge to the SCAT, right now it's just squared off. Removing the screen is a easy task.
Thanks.
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