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sarg314(at)gmail.com
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 Posted: Tue Aug 10, 2010 8:03 am Post subject: van's oil temp. gauge |
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I have a VM1000 engine monitor in my 6A. It's good, but it provides a single point failure for all of my engine instruments. So, I also added a Van's oil temp., oil pressure and voltage steam gauges. The VM1000 temp. probe is mounted in the IO-360 in the usual place and the probe for the Van's gauge is mounted in one of the unused oil pan drain plugs - it's had a 1/8 npt hole drilled and tapped through it for the probe.
A man with 2 watches never knows what time it is and a man with 2 oil temp. gauges doesn't know his oil temperature.
The Van's gauge has always read higher. Yesterday (the plane's 3rd flight) the VM1000 showed 201 deg. oil T. and the Van's gauge showed 240 - just shy of red-line. The cyl. head temps were 380 and exhaust gas was in the 1200's so I think the engine was OK. I think the Van's gauge is just wrong, but I throttled back anyway and returned to the airport. The VM1000 temp went down to about 193 and the Van's gauge went down to about 220 - a disproportionate change. Tonight I'll go to the hangar and try to calibrate the 2 gauges with a cup of hot water.
So, here are my questions: Am I correct that the normal Lycoming oil temp probe location measures the oil temp. just before the oil goes into the oil cooler?
If I had 2 accurate temp. gauges, shouldn't I expect the oil in the oil pan to show a temperature that is lower than the temp just before the oil goes into the cooler?
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Tom Sargent
[quote][b]
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sarg314(at)gmail.com
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| Posted: Tue Aug 10, 2010 8:41 am Post subject: van's oil temp. gauge |
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Well, I have to respond to my own post - I just learned something about Lycomings I didn't know. The normal Lyc. temp probe location measures oil temp just AFTER it comes out of the oil cooler. The sump temperature is the hottest oil temp. It can be expected to be 20 or 30 deg. hotter than the normal probe location. So, I'm thinking the Van's gauge is probably not very accurate, but was reading much closer to correct than I thought.
On Tue, Aug 10, 2010 at 9:00 AM, thomas sargent <sarg314(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: | I have a VM1000 engine monitor in my 6A. It's good, but it provides a single point failure for all of my engine instruments. So, I also added a Van's oil temp., oil pressure and voltage steam gauges. The VM1000 temp. probe is mounted in the IO-360 in the usual place and the probe for the Van's gauge is mounted in one of the unused oil pan drain plugs - it's had a 1/8 npt hole drilled and tapped through it for the probe.
A man with 2 watches never knows what time it is and a man with 2 oil temp. gauges doesn't know his oil temperature.
The Van's gauge has always read higher. Yesterday (the plane's 3rd flight) the VM1000 showed 201 deg. oil T. and the Van's gauge showed 240 - just shy of red-line. The cyl. head temps were 380 and exhaust gas was in the 1200's so I think the engine was OK. I think the Van's gauge is just wrong, but I throttled back anyway and returned to the airport. The VM1000 temp went down to about 193 and the Van's gauge went down to about 220 - a disproportionate change. Tonight I'll go to the hangar and try to calibrate the 2 gauges with a cup of hot water.
So, here are my questions: Am I correct that the normal Lycoming oil temp probe location measures the oil temp. just before the oil goes into the oil cooler?
If I had 2 accurate temp. gauges, shouldn't I expect the oil in the oil pan to show a temperature that is lower than the temp just before the oil goes into the cooler?
--
Tom Sargent
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Tom Sargent
[quote][b]
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n223rv(at)wolflakeairport
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| Posted: Tue Aug 10, 2010 8:44 am Post subject: van's oil temp. gauge |
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May want to cross post on the Lycoming list....
Do not archive
Sent from my iPhone
On Aug 10, 2010, at 12:00 PM, thomas sargent <sarg314(at)gmail.com (sarg314(at)gmail.com)> wrote:
[quote]I have a VM1000 engine monitor in my 6A. It's good, but it provides a single point failure for all of my engine instruments. So, I also added a Van's oil temp., oil pressure and voltage steam gauges. The VM1000 temp. probe is mounted in the IO-360 in the usual place and the probe for the Van's gauge is mounted in one of the unused oil pan drain plugs - it's had a 1/8 npt hole drilled and tapped through it for the probe.
A man with 2 watches never knows what time it is and a man with 2 oil temp. gauges doesn't know his oil temperature.
The Van's gauge has always read higher. Yesterday (the plane's 3rd flight) the VM1000 showed 201 deg. oil T. and the Van's gauge showed 240 - just shy of red-line. The cyl. head temps were 380 and exhaust gas was in the 1200's so I think the engine was OK. I think the Van's gauge is just wrong, but I throttled back anyway and returned to the airport. The VM1000 temp went down to about 193 and the Van's gauge went down to about 220 - a disproportionate change. Tonight I'll go to the hangar and try to calibrate the 2 gauges with a cup of hot water.
So, here are my questions: Am I correct that the normal Lycoming oil temp probe location measures the oil temp. just before the oil goes into the oil cooler?
If I had 2 accurate temp. gauges, shouldn't I expect the oil in the oil pan to show a temperature that is lower than the temp just before the oil goes into the cooler?
--
Tom Sargent
[b]
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n801bh(at)netzero.com
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| Posted: Tue Aug 10, 2010 10:48 am Post subject: van's oil temp. gauge |
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I have argued this point for years. As a racer and engine builder I want to know the 'actual' temp of the oil. That true temp is how hot the oil is in real time as it flows into the sump, not the temp of the oil coming back from the cooler. You can have a very efficient oil cooler that sheds alot of heat and monitoring cooled oil temps will mask issues. Say, for instance the real temp as it is in the oil sump is 260 and the cooler removes 80 degrees, the motor is exposed to the higher number. That 260 degrees will be reducing the life of the seals, bearings ,etc. By displaying after cooler temps you are just seeing a feel good number..
YMMV
do not archive
Ben Haas
N801BH
www.haaspowerair.com
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