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gengrumpy
Joined: 07 May 2013
Posts: 131
Location: Tullahoma, TN
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 Posted: Sat May 28, 2016 7:04 am Post subject: Oil capacity |
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Be careful! If your oil temps get that high, your cylinder head temps will likely be well beyond 400…and you don’t want to go there! CHTs are far more important to monitor than oil….just ask Mike Busch.
grumpy
| Quote: | On May 28, 2016, at 9:29 AM, Flysrv10 <flysrv10(at)gmail.com> wrote:
I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
Sent from my iPhone
> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
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>
>
> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
>
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>
>
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rv10flyer(at)live.com
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| Posted: Sat May 28, 2016 12:22 pm Post subject: Oil capacity |
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Kelly beat me to the same response. There shouldn't be s reason why you should see 220 if you can cut back the power to keep airspeed up initially as the temps on the CHT goes down than add power you should be able to keep everything low.
My flight this morning
FT on takeoff
2500 rpm at 800 male
Power back to 85%
Oil was 193 and CHT Topped 395f
Went down from there.
Don't let the oil get too hot but also don't worry if it does get up there (220-225) for s brief moment because you need altitude or another reason.
| Quote: | On May 28, 2016, at 7:42 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
I would recommend against allowing oil temp to climb above 225. Yes, Lycoming red line is 245. You do not want to operate anywhere near the red line, as oil begins breaking down much above that, and the oil temp probe is at the coolest point in the whole oil system, in the return line from the oil cooler.
Take action via increased airspeed and/or reduced power as soon as oil temp goes above 220. It will take time for it to come down. It may in fact increase some before it starts to come down.
Kelly
> On 5/28/2016 7:29 AM, Flysrv10 wrote:
>
>
> I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
>
> On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
>
> Sent from my iPhone
>
>> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
>>
>>
>>
>> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
|
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flysrv10(at)gmail.com
Guest
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| Posted: Sat May 28, 2016 6:23 pm Post subject: Oil capacity |
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Thanks Kelly for the warning. I will watch for the trend and stop at 220.
Sent from my iPhone
| Quote: | On May 28, 2016, at 8:38 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
I would recommend against allowing oil temp to climb above 225. Yes, Lycoming red line is 245. You do not want to operate anywhere near the red line, as oil begins breaking down much above that, and the oil temp probe is at the coolest point in the whole oil system, in the return line from the oil cooler.
Take action via increased airspeed and/or reduced power as soon as oil temp goes above 220. It will take time for it to come down. It may in fact increase some before it starts to come down.
Kelly
> On 5/28/2016 7:29 AM, Flysrv10 wrote:
>
>
> I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
>
> On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
>
> Sent from my iPhone
>
>> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
>>
>>
>>
>> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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flysrv10(at)gmail.com
Guest
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| Posted: Sat May 28, 2016 6:24 pm Post subject: Oil capacity |
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Thanks. I agree.
Sent from my iPhone
| Quote: | On May 28, 2016, at 1:11 PM, P Reid <rv10flyer(at)live.com> wrote:
Kelly beat me to the same response. There shouldn't be s reason why you should see 220 if you can cut back the power to keep airspeed up initially as the temps on the CHT goes down than add power you should be able to keep everything low.
My flight this morning
FT on takeoff
2500 rpm at 800 male
Power back to 85%
Oil was 193 and CHT Topped 395f
Went down from there.
Don't let the oil get too hot but also don't worry if it does get up there (220-225) for s brief moment because you need altitude or another reason.
> On May 28, 2016, at 7:42 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
>
>
>
> I would recommend against allowing oil temp to climb above 225. Yes, Lycoming red line is 245. You do not want to operate anywhere near the red line, as oil begins breaking down much above that, and the oil temp probe is at the coolest point in the whole oil system, in the return line from the oil cooler.
> Take action via increased airspeed and/or reduced power as soon as oil temp goes above 220. It will take time for it to come down. It may in fact increase some before it starts to come down.
> Kelly
>
>> On 5/28/2016 7:29 AM, Flysrv10 wrote:
>>
>>
>> I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
>>
>> On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
>>
>> Sent from my iPhone
>>
>>> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
>>>
>>>
>>>
>>> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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jesse(at)saintaviation.co
Guest
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| Posted: Sat May 28, 2016 7:15 pm Post subject: Oil capacity |
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I had an engine that seemed to always run hot oil. I talked to Mahlon at Mattituck and he said to check the temp of the oil filter after a flight with a laser thermometer with the engine running. He said the oil filter should be within 10-15 degrees of the oil temp sensor if the sensor is working correctly. Ours was about 30-35 degrees cooler. He said it was most likely a bad probe and to carry on. Just a thought, but it could be the probe or the wiring to the probe. I have seen that before. What is the lowest it runs in cruise?
Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com
Sent from my iPad
| Quote: | On May 28, 2016, at 10:22 PM, Flysrv10 <flysrv10(at)gmail.com> wrote:
Thanks. I agree.
Sent from my iPhone
> On May 28, 2016, at 1:11 PM, P Reid <rv10flyer(at)live.com> wrote:
>
>
>
> Kelly beat me to the same response. There shouldn't be s reason why you should see 220 if you can cut back the power to keep airspeed up initially as the temps on the CHT goes down than add power you should be able to keep everything low.
> My flight this morning
> FT on takeoff
> 2500 rpm at 800 male
> Power back to 85%
> Oil was 193 and CHT Topped 395f
> Went down from there.
>
> Don't let the oil get too hot but also don't worry if it does get up there (220-225) for s brief moment because you need altitude or another reason.
>
>
>> On May 28, 2016, at 7:42 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
>>
>>
>>
>> I would recommend against allowing oil temp to climb above 225. Yes, Lycoming red line is 245. You do not want to operate anywhere near the red line, as oil begins breaking down much above that, and the oil temp probe is at the coolest point in the whole oil system, in the return line from the oil cooler.
>> Take action via increased airspeed and/or reduced power as soon as oil temp goes above 220. It will take time for it to come down. It may in fact increase some before it starts to come down.
>> Kelly
>>
>>> On 5/28/2016 7:29 AM, Flysrv10 wrote:
>>>
>>>
>>> I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
>>>
>>> On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
>>>
>>> Sent from my iPhone
>>>
>>>> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
>>>>
>>>>
>>>>
>>>> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
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| Back to top |
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flysrv10(at)gmail.com
Guest
|
| Posted: Sun May 29, 2016 9:32 am Post subject: Oil capacity |
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Thanks Jessie for the top. I normally see average of 180. In winter travel, I may only see 160. Since I don't live in a cold climate, I have not worried about the low temp.
Sent from my iPhone
| Quote: | On May 28, 2016, at 9:13 PM, Jesse Saint <jesse(at)saintaviation.com> wrote:
I had an engine that seemed to always run hot oil. I talked to Mahlon at Mattituck and he said to check the temp of the oil filter after a flight with a laser thermometer with the engine running. He said the oil filter should be within 10-15 degrees of the oil temp sensor if the sensor is working correctly. Ours was about 30-35 degrees cooler. He said it was most likely a bad probe and to carry on. Just a thought, but it could be the probe or the wiring to the probe. I have seen that before. What is the lowest it runs in cruise?
Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com
Sent from my iPad
> On May 28, 2016, at 10:22 PM, Flysrv10 <flysrv10(at)gmail.com> wrote:
>
>
>
> Thanks. I agree.
>
> Sent from my iPhone
>
>> On May 28, 2016, at 1:11 PM, P Reid <rv10flyer(at)live.com> wrote:
>>
>>
>>
>> Kelly beat me to the same response. There shouldn't be s reason why you should see 220 if you can cut back the power to keep airspeed up initially as the temps on the CHT goes down than add power you should be able to keep everything low.
>> My flight this morning
>> FT on takeoff
>> 2500 rpm at 800 male
>> Power back to 85%
>> Oil was 193 and CHT Topped 395f
>> Went down from there.
>>
>> Don't let the oil get too hot but also don't worry if it does get up there (220-225) for s brief moment because you need altitude or another reason.
>>
>>
>>> On May 28, 2016, at 7:42 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
>>>
>>>
>>>
>>> I would recommend against allowing oil temp to climb above 225. Yes, Lycoming red line is 245. You do not want to operate anywhere near the red line, as oil begins breaking down much above that, and the oil temp probe is at the coolest point in the whole oil system, in the return line from the oil cooler.
>>> Take action via increased airspeed and/or reduced power as soon as oil temp goes above 220. It will take time for it to come down. It may in fact increase some before it starts to come down.
>>> Kelly
>>>
>>>> On 5/28/2016 7:29 AM, Flysrv10 wrote:
>>>>
>>>>
>>>> I want to thank everyone for responding to my issue. Lots of good information that will help me decide what to do, if anything.
>>>>
>>>> On my return trip next week, I am going to continue the climb to see if I reach 245 deg oil temp. Hopefully it will stabilize somewhere below 245. If I find something useful, I will share with the group.
>>>>
>>>> Sent from my iPhone
>>>>
>>>>> On May 27, 2016, at 8:04 PM, <kboatright1(at)comcast.net> <kboatright1(at)comcast.net> wrote:
>>>>>
>>>>>
>>>>>
>>>>> Unless you're low enough on oil to lose oil pressure, oil quantity does not have an appreciable impact on oil temperature. More oil does not result in more cooling capacity. Cooling capacity is the a function of the cylinder fins, the oil cooler, and the surface of the engine block, accessory case, and sump. All of those reject heat into an airstream which has a flow rate and a delta T(emperature). Adding oil doesn't change the mass flow through the oil cooler or the surface area which is radiating heat, nor does it change anything about the airstream.
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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