Yak 9 engine overheating

[Guest deleted@219798]

Since whatever update the Yak 9 engine is overheating. You have to throttle back to around 80-85%. Yet the Yak 1 which uses the same engine doesn't have this problem.

[ShamrockOneFive]

With what radiator settings?

[TheDome]

While i have not flown the 9 since the last couple of updates i have flown the 9T in a good few different temp ranges and had no issues with it

[the_emperor]

I think from all Yaks/Laggs with the Klimov M-105PF engine, the Yak-9 is the most benign in regards to radiator management.

Since even on 0% the radiator is still not fully closed, you can mostly set it to a very low setting, then you only have to watch the oil temp, but there you can set the rad to ~50% and forgett about it. Just remember to set  fuel mixture to 100% below FTH (~4000m) as the enriched mixture has an additional cooling effect, if you dont have to watch your fuel consumption.

The Engine limitions from the manuals are as followed (they are bit contradicting):

1) Do not allow water and oil temperatures above 110 °C

2) Water: max. 10 min for 110°C

3) Oil: max: 115° for 5min; max 110°C for 10min

4)The recommended water and oil temperature is 90-100 °C

 

Edited January 14, 2022 by the_emperor

[Guest deleted@219798]

Thanks for the replies seems fairly straight forward. At least it run better than P39 and P40.

[I./JG52_Woutwocampe]

Well if its Kuban summer, you'll overheat if its 28 degrees unless you open your rads properly.

 

I never overheat it with oil rad at 50-66%, cooling rad at 66%-75%, 2500-2600 rpms and MAP around 850 or 900 mm hg. No need for 100% mixture, in summer I stick around 75% and will lean it above 3500m or 4000, way into the 2nd supercharger gear.

 

In summer, you just cannot go 2700 rpms and 1050 mm hg for very long even with the rads fully open, you'll still overheat.

[CountZero]

oh look an airplane with no engine timers but player cant just fly max throttle all the time because there is no timers, it makes player do more in engine control and to think about what hes doing to his engine then on airlanes that have 3-4 differant engine timers where you just count seconds and minutes to control your engine like a real pilot do lol.

[Zorkij5601]

On 1/14/2022 at 7:53 AM, the_emperor said:

I think from all Yaks/Laggs with the Klimov M-105PF engine, the Yak-9 is the most benign in regards to radiator management.

Since even on 0% the radiator is still not fully closed, you can mostly set it to a very low setting, then you only have to watch the oil temp, but there you can set the rad to ~50% and forgett about it. Just remember to set  fuel mixture to 100% below FTH (~4000m) as the enriched mixture has an additional cooling effect, if you dont have to watch your fuel consumption.

The Engine limitions from the manuals are as followed (they are bit contradicting):

1) Do not allow water and oil temperatures above 110 °C

2) Water: max. 10 min for 110°C

3) Oil: max: 115° for 5min; max 110°C for 10min

4)The recommended water and oil temperature is 90-100 °C

 

Thanks the_emperor!
by following your advices (couldn't imagine fuel mixture would affect temperature so much!) I finally managed and eliminate what I thought it was a fatal Yak-9s flaw.

 

[the_emperor]

 

1 hour ago, zepset1969 said:

Thanks the_emperor!
by following your advices (couldn't imagine fuel mixture would affect temperature so much!) I finally managed and eliminate what I thought it was a fatal Yak-9s flaw.

 

Your are welcome.

though currently in the game the temp limit for the Yaks and Laggs with the M-105PF engine seems to be 115C instead of the correct 110C. so hopefully that gets corrected in the next patch. 

[GOZR]

On 1/13/2022 at 10:53 PM, the_emperor said:

 

 

On 1/13/2022 at 10:53 PM, the_emperor said:

 water ( 97% ethylene Glycol ) temperatures above take off 85°C ... in flight 105-115°C... maximum 125 °C  

 

 Oil  for Summer ( Grate 1120 AES Spec. N124 ) Winter ( Grate 1100 AES Spec. N127 )

 

On 1/13/2022 at 10:53 PM, the_emperor said:

 

 

Edited July 29, 2023 by GOZR

[RossMarBow]

To fly fast in the yak9

 

You want to be adjusting the water radiator a lot - it provides too much cooling and drag if its even 10% more open than it needs to be

also max level speed at sea level is 84% RPM
if you a traveling faster than max level speed reduce rpm further

Keep checking you six if your boiling coolant your water is too hot

 

Oil I think you can set to 33% and not get any extra drag, but oil heat shouldn't be an issue

 

rpm also saves heat

running rich saves heat