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1. 07:13 PM - Oil temp still too high (Jon Boede)
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| Subject: | Oil temp still too high |
My oil temperature continues to be too high during engine break-in despite
attempts to mitigate it.
Engine: zero-time overhaul M-14P, standard compression Barrett pistons, aut
o harness, no other engine mods (on a stock CJ-6A)
Does have Criag's oil filter kit. Oil cooler recently overhauled by Pacifi
c Coast.
Previously I had very high oil temps and high CHTs so I went from a 1.4mm s
uction jet to a 1.3mm suction jet and switched from Aeroshell 100 straight
mineral to Aeroshell 120 straight mineral (which is quite hard to find!)
Ambient air temperature 36C/97F. Field elevation 500 MSL.
Engine start showed oil pressure at 5 bar with inlet temp 35C.
Take-off at 2900 RPM and full throttle resulted in CHTs climbing to 210C an
d oil inlet temp to 65C, outlet climbing to 85C, oil pressure 5 bar.
Settled in a little lower than pattern altitude due to high CHT then CHT ca
me back to 160-170C at 650-700mm MAP. Oil pressure 4 bar at 2400 rpm.
Oil temp continued to climb to 75C inlet temp, 100-110C outlet temp, while
CHT 160C, oil pressure 4 bar at 2400 rpm.
Two circuits in the pattern at ~650mm MAP, oil inlet temp stabilizes at 75-
80C, outlet 110C, CHT 160C, oil pressure a little below 4 bar at 2400 rpm.
Landed, CHT now dropping, oil inlet still 75C outlet 100C, approximately 10
00 rpm, oil pressure now below 1 bar.
Ideas?
Jon
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