Dave,
What engine?
It may be that cold oil slows the output until it reaches the
heating area and then once through, resumes normal readings. this is true
for every engine in which Start is not preceded by pre-oil or preheat
circulation.
In some engines, (PW wasp on harvard) a cutoff valve shorts the
radiator until the engine oil shows temp, then it is released to let cold
oil pass through the engine - IF memory serves.
Ferg
----- Original Message -----
From: <DJA727@aol.com>
Subject: Europa-List: OIl pressure at Start
|
| The weather has recently turned from summer to winter here (in about 12
| hours!). I have made two starts and flights during the cold weather and
noticed a
| strange oil pressure reading. At start, the oil pressure comes up normally
to
| about 60. Then, in the first 3 to 4 minutes, it slowly decreases -- in one
case
| to about 20 and in the other case to about 38. The 20 case was colder
weather
| than the 38. When I am about to turn around and taxi back in, the oil
| pressure starts to rise and in about 30 seconds it returns to the normal
55 to 60
| psi.
|
| After the first time, I let the engine cool after flight to about 100
degrees
| F oil temp and did a restart. In that case, the oil pressure comes up to
| normal 55 to 60 and just stays there.
|
| I am not sure if this is something that has been going on all along and I
| just noticed it, or a new problem or even a problem at all. It seems to be
| temperature related and acts like a sticking or a slow oil pressure
control valve.
|
| Does anybody have any experience with this sort of thing?
|
| Thanks,
|
| Dave
| A227
| Mini U2
|
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