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AirMike
Joined: 27 Feb 2007
Posts: 514
Location: Nevada
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 Posted: Sat Jun 19, 2010 5:52 am Post subject: Normal oil pressure indications |
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I was showing quite high (96 psi) oil pressure indications in climb out. (I never take off till the oil hits 100 degrees)
I adjusted it to indicate 86 psi in high power mode. Is this too high or it it acceptable?
Would somebody tell me what is normal at
run-up - climb - cruise
I am using break-in oil
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sat Jun 19, 2010 6:13 am Post subject: Normal oil pressure indications |
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It is hard to put a number on the oil pressure, because Lycoming and Cessna have been playing with the numbers. There is an old issue, particularly with 4 cylinder Lycomings that the pax side of the engine gets less oil to the valve rocker box area and tends to have more valve stem distress. So for the current 172, the oil pressure pick-off point was changed, and as a result that engine is running over 100 psi measured at the older location. Unless you are leaking or blowing a gasket, there really isn't a too high number. Ideally, you probably want above 30 for taxiing in with engine hot, above 60 in climb and cruise. Many Lycomings have middle of green around 65-75 psi, but it really isn't a number to get too obsessed about. I'd leave it where you have it, see what numbers you get when the engine is hot and what you see after landing. Make the lowest indications high enough for comfort and don't worry too much about the high end.
That said, from the Lycoming O/IO-540 operator's manual: "Oil pressure maximum 95, minimum 55, idling 25, startup and warm up 115."
On Sat, Jun 19, 2010 at 6:52 AM, AirMike <Mikeabel(at)pacbell.net (Mikeabel(at)pacbell.net)> wrote:
[quote]--> RV10-List message posted by: "AirMike" <Mikeabel(at)Pacbell.net>
I was showing quite high (96 psi) oil pressure indications in climb out. (I never take off till the oil hits 100 degrees)
I adjusted it to indicate 86 psi in high power mode. Is this too high or it it acceptable?
Would somebody tell me what is normal at
run-up - climb - cruise
I am using break-in oil
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OSH '10 or Bust
Q/B - finally done
Read this topic online here:
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sat Jun 19, 2010 6:22 am Post subject: Normal oil pressure indications |
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Personally, I'd have left it where it was.
Tim Olson - RV-10 N104CD
do not archive
On 6/19/2010 8:52 AM, AirMike wrote:
| Quote: |
I was showing quite high (96 psi) oil pressure indications in climb out. (I never take off till the oil hits 100 degrees)
I adjusted it to indicate 86 psi in high power mode. Is this too high or it it acceptable?
Would somebody tell me what is normal at
run-up - climb - cruise
I am using break-in oil
--------
OSH '10 or Bust
Q/B - finally done
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=301734#301734
|
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Sat Jun 19, 2010 9:44 am Post subject: Normal oil pressure indications |
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Hey Mike,
We just did the same thing. First flight with break in oil tripped the high
oil pressure warning at climb out -- probably wasn't warmed up enough.
Second flight was into the yellow on climb out, but no warning message. Wes
wasn't comfortable with it on the edge like that, so we took a washer out of
the oil pressure spring seat, and that was better. Last week we changed out
the break in oil for the regular multi viscosity, and now with the heat of
summer, the indicator is just above the center of the green -- AFS system.
Sorry I don't have the pressure, temp, viscosity, etc. just wanted to let
you know that the "real" oil and OAT made a difference.
Later, - Lew
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