reported 'Engine Degraded' with WEP usage

[peachmonkey]

On 12/25/2024 at 11:55 AM, SloppyDog said:

In the December 24th, 2024 update, they said they fixed it:

DCS 2.9.11.4686 

DCS: P-47D Thunderbolt by Eagle Dynamics

• Fixed. Engine degraded with WEP usage

I have to test it though.

I had a "engine degraded" failure couple of days ago, and that was already on the ground after landing. I've used water injection prior to that for maybe 45-60 seconds, all engine temps were within their limits. Sounds like the issue may still be there...

[Cool-Hand]

On 1/5/2025 at 10:54 AM, peachmonkey said:

I had a "engine degraded" failure couple of days ago, and that was already on the ground after landing. I've used water injection prior to that for maybe 45-60 seconds, all engine temps were within their limits. Sounds like the issue may still be there...

Yeesh yeah if that's happening it sure sounds like the issue isn't resolved. I haven't tested extensively since the patch but a squadron mate of mine reported a similar thing on Project Overlord server.

[Cool-Hand]

Just some testing done in the same manner as previously reported after the 'fix' was included in the patch.

@NineLine

@BIGNEWY

New Patch WEP 5 mins then degraded 29 Mins .trk

Edited January 7 by Cool-Hand

[Cool-Hand]

     

@NineLine

@BIGNEWY

The engine problem with the P-47 is still active even after shutdown

New Patch Engine Degraded after shutdown.trk

[PawlaczGMD]

Same, I got engine degraded after cruising below max continuous settings on RTB after a long mission. Temps were normal, then suddenly Engine degraded, than a minute later oil temp spikes and the engine seizes.

Water injection was used in combat 15-20 minutes prior to the failure.

Edited February 9 by PawlaczGMD

[Cool-Hand]

Engine Degrades in 3 mins WEP All radiators and shutters open.trk

 

I did some testing finally after the fixes on the P-47 and I'm still getting the 'Engine Degraded' failure. This happened 3 minutes after running WEP with all the oil radiators and inlet shutters wide open and no temperature exceedances. I'm not really sure what all was fixed the past couple of times but all the limits and temperatures are being abided by and the failure is so non descriptive in the log as to what happened that its completely unhelpful in trying to diagnose what is going on to cause this. 

Edited March 21 by Cool-Hand

[PawlaczGMD]

12 hours ago, Cool-Hand said:

Engine Degrades in 3 mins WEP All radiators and shutters open.trk 3.02 MB · 2 downloads

 

I did some testing finally after the fixes on the P-47 and I'm still getting the 'Engine Degraded' failure. This happened 3 minutes after running WEP with all the oil radiators and inlet shutters wide open and no temperature exceedances. I'm not really sure what all was fixed the past couple of times but all the limits and temperatures are being abided by and the failure is so non descriptive in the log as to what happened that its completely unhelpful in trying to diagnose what is going on to cause this. 

Did you not warm up the engine? 1 min after takeoff seems like a different failure. I was getting it after an hour of flying and at low power settings.

[Cool-Hand]

3 hours ago, PawlaczGMD said:

Did you not warm up the engine? 1 min after takeoff seems like a different failure. I was getting it after an hour of flying and at low power settings.

Buddy it's an airstart from the quick missions menu, no warm up needed. Why not just take the roughly 3 mins and watch the track file. Yeah I've got over a years worth of tracks in this thread showing what you are talking about as well.

[ShuRugal]

17 hours ago, Cool-Hand said:

Engine Degrades in 3 mins WEP All radiators and shutters open.trk 3.02 MB · 3 downloads

 

I did some testing finally after the fixes on the P-47 and I'm still getting the 'Engine Degraded' failure. This happened 3 minutes after running WEP with all the oil radiators and inlet shutters wide open and no temperature exceedances. I'm not really sure what all was fixed the past couple of times but all the limits and temperatures are being abided by and the failure is so non descriptive in the log as to what happened that its completely unhelpful in trying to diagnose what is going on to cause this. 

In this image here, it shows a hair over 250 MPH IAS?  Is that the speed you were flying with WEP engaged?

 

I know that the Mustang will overheat at max power if you're below about 300 MPH for more than a few minutes. 

 

I haven't gone through your tracks, but is the failure rate of WEP usage in any way coupled with airspeed?  You mentioned that opening the radiators full mitigates failure risk, which makes me suspect WEP is being used at too slow an airspeed for effective cooling.

[Art-J]

Err..... Read again. He clearly mentions that despite having radiators full open and temps within limits, he got an engine failure. I watched the track and he also stayed within rated limit of 64" even though the plane can be overboosted much more.

@Cool-Hand ever tried to repeat the test at combat RPM of 2550 instead of 2700? I haven't "torture-tested" P-47 in recent patches, but last year one could fly at 71" until water ran dry and the engine would take it no problem (well, minus oil getting a bit hot) as long as I kept it at 2550.

[Cool-Hand]

1 hour ago, Art-J said:

Err..... Read again. He clearly mentions that despite having radiators full open and temps within limits, he got an engine failure. I watched the track and he also stayed within rated limit of 64" even though the plane can be overboosted much more.

@Cool-Hand ever tried to repeat the test at combat RPM of 2550 instead of 2700? I haven't "torture-tested" P-47 in recent patches, but last year one could fly at 71" until water ran dry and the engine would take it no problem (well, minus oil getting a bit hot) as long as I kept it at 2550.

Yeah I haven't tried that in this latest patch. I was really testing to see if the engine died after shutdown like it did several patches back but the first trial run I did this happened, previously it was pretty random if the engine would die from 1 minute to an 1 hour later after using 5 mins WEP and then max continuous or cruise.  I'll see about the reduced RPM, when I get a chance but I do recall trying that previously it would pack up and be 'degraded' later on in the flight which is the problem that I usually see mentioned.  Thanks for watching the track, like I say its not very long and pretty well shows the engine isn't being red-lined at all.

 

@ShuRugal I know its hard to see but the current time is almost a minute and a half after the engine degrades from the timelog, it has slowed down that much from 300+mph IAS with the engine degraded.

Edited March 21 by Cool-Hand

[ShuRugal]

4 minutes ago, Cool-Hand said:

@ShuRugal I know its hard to see but the current time is almost a minute and a half after the engine degrades from the timelog, it has slowed down that much from 300+mph IAS with the engine degraded.

thanks, that answers my question!

[PawlaczGMD]

On 3/21/2025 at 12:52 PM, Art-J said:

Err..... Read again. He clearly mentions that despite having radiators full open and temps within limits, he got an engine failure. I watched the track and he also stayed within rated limit of 64" even though the plane can be overboosted much more.

@Cool-Hand ever tried to repeat the test at combat RPM of 2550 instead of 2700? I haven't "torture-tested" P-47 in recent patches, but last year one could fly at 71" until water ran dry and the engine would take it no problem (well, minus oil getting a bit hot) as long as I kept it at 2550.

I went back to Reflected's P-47 campaign after the engine degraded patch, and did not run into any issues with the engine dying long after WEP use so far.

Testing in some difficult dogfights VS the 109, the engine will die after about 5 minutes of WEP despite all temps being in range. This is a reasonable wear limit I guess, but not really in line with how other planes are modelled, where the engine will be fine as long as the temps stay good.

I've only tested running 2550 RPM once so far, and it indeed seems to survive much longer. More testing is needed, but there might be something to it. I just wonder what the logic here is. RPM itself is not the issue, because the engine can run at 2700 at lower boost no problem. Temperatures are not exceeded. AFAIK, higher RPM at high boost = lower engine stress. 

Edited April 14 by PawlaczGMD