Oil temperature indicator question

[LukeFF]

I have noticed in Russian aircraft that many planes have two oil temperature gauges: one for "incoming" temperature and another for "outgoing" temperature. What exactly is the difference between the two?

[Rama]

Are you sure?

For Lagg, Yak and Pe2 I see 1 oil temperature gauge, 1 coolant  temperature gauge, 1 oil pressure and 1 carburant pressure gauge.

Maybe with a screenshot we can find.

[Cybermat47]

I have noticed in Russian aircraft that many planes have two oil temperature gauges: one for "incoming" temperature and another for "outgoing" temperature. What exactly is the difference between the two?

Maybe it has something to do with exhaust, like the outgoing temperature is what's coming out the exhausts, and the incoming is what the oil is being heated to? That's just a guess though, and I don't know that much about engines, so sorry if my last sentence made no sense at all

[LukeFF]

Are you sure?

For Lagg, Yak and Pe2 I see 1 oil temperature gauge, 1 coolant  temperature gauge, 1 oil pressure and 1 carburant pressure gauge.

Maybe with a screenshot we can find.

 

In the Il-2, there are two oil temperature gauges. Sorry, I should've been more clear in my first post.

[Cybermat47]

In the Il-2, there are two oil temperature gauges. Sorry, I should've been more clear in my first post.

Maybe it's something unique to aircraft with the same engine as the IL-2 (if any aircraft used it other than the IL-2). I could look up pictures of cockpits on the internet to see if any other aircraft had the two oil temperature gauges if you like

[FTC_Cule]

The IL2 was a heavy plane that used multiple cooling devices. It is possible that the cooling apparatus indicators were positioned in different areas of the engine to ensure an accurate reading of oil temperature, or that there is a second gauge for a different part of the engine oiling device.

 

I'm only experienced with Luftwaffe aircraft, so possibly I'm wrong! please correct me if so.

[MiloMorai]

maybe this will help (translation required)

 

[NZTyphoon]

maybe this will help (translation required)

 

 

Looking at the dials marked 3, 4 & 5:

 

 

Is this a rough enough translation?

 

воды = water не ниже = not below 80°

 

ВХОДЯЩеГО = incoming масла = oil - not below 40°

выходящего = outgoing oil not below 70°  

[Venturi]

The outgoing (to rad) temp tells you how hard you are pushing the motor, the incoming (to engine), or rather the delta between the two, tells you how effective the cooling at that speed, altitude, ambient temperature, and rad setting. It's important because oil is designed to operate at a specific temperature range to achieve the designed viscosity. An important value to know, when ambient temp (Russia, Winter) can cool so effectively, it makes the oil exceedingly thick and impede return flow, overpressurize oil lines, blow seals, etc. Oil has a much lower specific heat than water.

Edited April 17, 2014 by Venturi

[Mastermariner]

Absolutely correct Venturi, but why was it deemed necessary on IL-2 and not on other airplanes?

Is it the engine? In that case do we see the same setup in Mig-1, Mig-2 and Pe-8 (if my memory serves me right)?

 

Master

[LukeFF]

The outgoing (to rad) temp tells you how hard you are pushing the motor, the incoming (to engine), or rather the delta between the two, tells you how effective the cooling at that speed, altitude, ambient temperature, and rad setting. It's important because oil is designed to operate at a specific temperature range to achieve the designed viscosity. An important value to know, when ambient temp (Russia, Winter) can cool so effectively, it makes the oil exceedingly thick and impede return flow, overpressurize oil lines, blow seals, etc. Oil has a much lower specific heat than water.

 

Thank you, I appreciate the explanation.

[Rama]

Absolutely correct Venturi, but why was it deemed necessary on IL-2 and not on other airplanes?

Is it the engine? In that case do we see the same setup in Mig-1, Mig-2 and Pe-8 (if my memory serves me right)?

Maybe because on IL-2 cooling was more a problem with the specific configuration of the water and oil radiators? (just trying to guess)

[NZTyphoon]

Absolutely correct Venturi, but why was it deemed necessary on IL-2 and not on other airplanes?

Is it the engine? In that case do we see the same setup in Mig-1, Mig-2 and Pe-8 (if my memory serves me right)?

 

Master

 

According to this http://wiki.sturmovik.de/index.php?title=MiG-3  there were two oil temperature gauges on the MiG-3's instrument panel:

 

[Rama]

According to this http://wiki.sturmovik.de/index.php?title=MiG-3  there were two oil temperature gauges on the MiG-3's instrument panel:

Not sure.... I don't think the oil temperature will ever be in the -5°/15° range while the engine is running...

[Venturi]

*10 perhaps but there are two identical guages

Edited April 19, 2014 by Venturi

[Rama]

*10 perhaps but there are two identical guages

What are the two identical gauges??

[NZTyphoon]

Not sure.... I don't think the oil temperature will ever be in the -5°/15° range while the engine is running...

Good point: the gauges outlined in blue and yellow are identical

 

ummm inscription under blue gauge масла = maslo = oil

yellow gauge вода = voda = water

 

can anyone translate the other words?

Edited April 19, 2014 by NZTyphoon

[Rama]

Good point: the gauges outlined in blue and yellow are identical

 

ummm inscription under blue gauge масла = maslo = oil

yellow gauge вода = voda = water

 

can anyone translate the other words?

 

For the yellow, it's "вода выход" (water exit)

... and the graduation are -5 0 10 15

I don't catch the meaning

 

If it's a temperature, then the only way I could understand it is a delta (Water temperature at engine exit - water temperature at engine entry)... but it's probably a bad guess.

Then maybe you're right and it's the same for the Blue one who could be a temperature delta gauge.

[Venturi]

Water rad and oil rad exit temps ??

Edited April 19, 2014 by Venturi

[Venturi]

Gotta be a delta if that's what they are. Could also be pressures at rad, hard to say. Strange with -5 markings.

Edited April 24, 2014 by Venturi

[FTC_Frederf]

Bf-110 also has split-needle type oil temperature readings for pre and post engine temp.