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richard.goode(at)russiana
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 Posted: Mon Aug 20, 2007 8:48 am Post subject: Oil Addatives |
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Oil Additives
Referring to Brian Lloyd's posting, I am not an oil specialist, but was wondering if Shell and Co. accept an INLET oil temperature of 120°C - i.e. a maximum temperature of possibly over 160°C. Is that really the case?
I am no defender of Russian oils, but the temperature for Yaks and Sukhois is of course INLET temperature - that is oil that has gone through the oil cooler; back into an oil tank and then now going back into the engine.
This cannot be compared with sump temperature on "wet-sump" engines.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Mob: +44 (0) 7768 610389
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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brian-1927(at)lloyd.com
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| Posted: Mon Aug 20, 2007 11:33 am Post subject: Oil Addatives |
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On Aug 20, 2007, at 9:35 AM, Richard Goode wrote:
| Quote: | Oil Additives
Referring to Brian Lloyd's posting, I am not an oil specialist, but
was wondering if Shell and Co. accept an INLET oil temperature of
120°C - i.e. a maximum temperature of possibly over 160°C. Is that
really the case?
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Yes. I spent time talking to one of the aviation oil engineers at
Shell about just this subject. He assured me that their standard is
oil *inlet* temperature as that is what is measured on Continental
and Lycoming horizontally-opposed engines. The oil temp is measured
at the screen/filter after the oil pump but before the oil enters the
engine's oil galleys. I pressed him specifically on this issue and he
concluded that what is measured in Lycoming/Continental horizontally-
opposed engines is indeed what we call oil inlet temperature. It is
the temperature of the oil as it enters the engine and before the
engine has a chance to transfer
| Quote: | I am no defender of Russian oils, but the temperature for Yaks and
Sukhois is of course INLET temperature - that is oil that has gone
through the oil cooler; back into an oil tank and then now going
back into the engine.
This cannot be compared with sump temperature on "wet-sump" engines.
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Uh, please explain why not? The engineer from Shell certainly thought
it could and so do I. From the point of view of the engine you have
the oil that is pumped into the galleys (inlet) and the oil that
returns to the sump (outlet). In the radial engines there are two oil
pumps: a scavenge pump that picks up the oil from the sump and pumps
it to the oil cooler and a pressure oil pump that takes the oil from
the cooler and pumps it to the oil galleys. In a Lycoming or
Continental there is only one oil pump but it performs both
functions. It scavenges the oil from the sump and sends it to the oil
cooler but since this is a more compact system, there is no second
oil pump that pumps the oil into the galleys. The oil from the cooler
then goes directly to the oil galleys.
Regardless, the inlet oil temp on our radial engines and the oil temp
in our horizontally-opposed engines are measured at the same place:
just before the oil enters the oil galleys headed for the bearings.
| Quote: |
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Mob: +44 (0) 7768 610389
Fax: +44 (0) 1544 340129
www.russianaeros.com
http://www.matronics.com/Navigator?Yak-List_-
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Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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dhanshew(at)cinci.rr.com
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| Posted: Tue Aug 21, 2007 2:43 pm Post subject: Oil Addatives |
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Tim Gagnon. Contact me off list. Wild Bill.
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HawkerPilot2015
Joined: 10 Jan 2006
Posts: 503
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| Posted: Tue Aug 21, 2007 8:22 pm Post subject: Re: Oil Addatives |
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| dhanshew(at)cinci.rr.com wrote: | | Tim Gagnon. Contact me off list. Wild Bill. |
Done.....
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