Engine Stops

[Thorns]

Take off ok, flying around with temps all good, and the engine just stops. Happened two times in a row...Alright Gurus...Why? What has changed and what am I doing wrong? Thx.

[-Rudel-]

Give more details, post a video, post a log, post a track.

Wee don't know what you did wrong just because temps are good.

[HotTom]

SAME PROBLEM

 

[-Rudel-]

Give more details, post a video, post a log, post a track.

Wee don't know what you did wrong just because temps are good.

[Rudel_chw]

55 minutes ago, Thorns said:

what am I doing wrong?

 

how could anyone answer that if you don't care enough to post a track? 

[Saxman]

Make sure you're switching from Reserve tank to Main and setting mixture to Auto-Lean once you're in the air. Also, watch your cylinder head temperatures and oil temperatures. The engine may die if it's run too hot for too long.

[HotTom]

May come as a shock to Rudel (who has helped me too many times to count) but I have never, in 15 years of flying DCS, made a track file. I had to find a lesson 

Here is my track file. It now happens every time both with and without wingmen.

Thanks!

LastMissionTrack.trk

[MIDWAY]

Perhaps its engine knock from to high of MP without the water injection?  I'm hearing a knocking sound now if I don't have the master WEP button on and am into the MP pressures where its needed.    Working just like the P47 for me.  

 

Edit:  Just tested.  Confirmed that engine knock from excessive MP WITHOUT WEP will cause engine seizures.  

Edit 2:  With WEP engaged, you can still exceed WEP MP pressures and knock the engine into a seizure.  Follow the manual...or listen for the knock.  The sound is pretty handy and nicely done.  

Edited 16 hours ago by MIDWAY

[Thorns]

Thanks Midway for the reply. Will see if that works. Cheers! 

3 hours ago, Rudel_chw said:

 

how could anyone answer that if you don't care enough to post a track? 

Rudel, this is DCS right after an update. Enough said…IYKYK…I’ve been flying this sim for a long time!

Edited 15 hours ago by Thorns

[Saxman]

1 hour ago, MIDWAY said:

Perhaps its engine knock from to high of MP without the water injection?  I'm hearing a knocking sound now if I don't have the master WEP button on and am into the MP pressures where its needed.    Working just like the P47 for me.  

So how does this work with the master switch now? Especially considering the Corsair didn't HAVE a master switch and it was all done through throttle position.

[Nealius]

With the MP needle spastically bouncing around up to 5" on the gauage how do we know precisely where we need WEP?

[-Rudel-]

38 minutes ago, Saxman said:

So how does this work with the master switch now? Especially considering the Corsair didn't HAVE a master switch and it was all done through throttle position.

[HotTom]

I tried again with a smaller ordnance load and no problems. Stuck to two 500lb bombs and four HVARs and the engine did not seize. Although the load of two 500-lb bombs and eight HVARS was within limits on the accompanying chart (98 percent) it seemed to overstrain the engine. I think that was my problem.

In other news: I still can't find a WEP switch or the A6M5. I have the latest update but don't see them. Strange.

[Nealius]

I don't recall seeing an A6M5 mentioned in the changelog.

[MIDWAY]

I did some more testing.

Oil temp definitely will cause the engine to seize now too.  Seems to only be a problem down low.  I bet this becomes a big problem for a lot of new people since the gauge is small and it changes quickly, especially carrier ops.  

Misuse of the supercharger handle caused issues as well.  Sometimes you'd get the knocking noise, sometimes the cockpit shakes quite a bit.  

Cylinder head temps cause issues.  Nothing new here.  

 

Overall its a lot to manage.  But I think its well done and nothing is surprising or sudden so long as you do normal instrument sweeps.  

Edited 12 hours ago by MIDWAY

[Saxman]

11 minutes ago, MIDWAY said:

I did some more testing.

Oil temp definitely will cause the engine to seize now too.  Seems to only be a problem down low.  I bet this becomes a big problem for a lot of new people since the gauge is small and it changes quickly, especially carrier ops.  

Misuse of the supercharger handle caused issues as well.  Sometimes you'd get the knocking noise, sometimes the cockpit shakes quite a bit.  

Cylinder head temps cause issues.  Nothing new here.  

 

Overall its a lot to manage.  But I think its well done and nothing is surprising or sudden so long as you do normal instrument sweeps.  

Carburetor temperatures appear to be VERY aggressive. It seems to take very little time under WEP for the carb temperature warning light to come on, at least at middle altitudes, forcing you to shift to Low or Neutral (even in the Low Blower band) and lose a good chunk of your power in the process. And your engine WILL seize if you don't. Personally I've never been a fan of this sort of engine temp modeling, as it just feels like an artificial limit on the player.

[MIDWAY]

Exceeding WEP time limits also causes gradual loss of power followed by a seizure.  No cockpit shaking or engine temps outside of limits on this failure.    More testing needed to see the time limits.  

Edit:  Military power (no wep) also has a time limit.  Follow the manual/ kneeboard data. 

I found max cruise MP/RPM pretty easily in my testing.  I'm keeping that to myself tho.  

32 minutes ago, Saxman said:

Carburetor temperatures appear to be VERY aggressive. It seems to take very little time under WEP for the carb temperature warning light to come on, at least at middle altitudes, forcing you to shift to Low or Neutral (even in the Low Blower band) and lose a good chunk of your power in the process. And your engine WILL seize if you don't. Personally I've never been a fan of this sort of engine temp modeling, as it just feels like an artificial limit on the player.

Intercooler flap are the key here.  Half open usually prevents issues unless your in the high blower too soon.  

Edited 11 hours ago by MIDWAY
More testing.

[C_casber]

same here engine quits after a while but only with to much wingload 

i start from the carrier fly 3 to 5 minutes in max continues 2550rpm 44mp

all theperatur are in the blue sector 

i watch the gauges the whole flight 

an when i fly witout any wing load nothing happens to the engine 

 

and when i start in the air with full wing loads also nithing happens to the engine 

i can fly max continues all time till my fuel runs out 

 

im not at home and cant provide a log file 

 

i think its a bug 

before the update nothing happen to the engine under the same conditions but after the update engine dies and i cant explain why 

i start in hot start on the carrier 

[Dallenbach]

I also have problems after this update. The engine stops after approx. 3-5 minutes, even under different conditions (taxiing with take-off on airfield, in flight, and on landing after approx. 5 min. flight) and this while maintaining the specifications. That's why no track file helps, I think.

[motoadve]

I doubt a big radial engine like this would be so fragile, seems overdone.

[Saxman]

10 hours ago, MIDWAY said:

I found max cruise MP/RPM pretty easily in my testing.  I'm keeping that to myself tho. 

Or you could just...open up the pilot's manual (standard cruise was on the order of 36in MAP @ 2150RPM).

10 hours ago, MIDWAY said:

Intercooler flap are the key here.  Half open usually prevents issues unless your in the high blower too soon.

I haven't done any flying up at nose bleed altitude yet, everything has been in Low Blower range. I'll try making sure the cooler is open next time I fly.

  

2 hours ago, motoadve said:

I doubt a big radial engine like this would be so fragile, seems overdone.

This has been an issue in flight sims for decades. I usually end up turning off engine overheats because the time for engines to cook off is almost always far too short, and the consequences much more severe. Like I'd said elsewhere, it almost always feels like it's an artificial/arbitrary player limiter, rather than a natural limit of the machinery itself.

Edited 1 hour ago by Saxman