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  #1  
Old 11-08-2019, 08:14 AM
ethand ethand is offline
 
Join Date: Mar 2013
Location: San Diego
Posts: 189
Default High CHT and EGT on Cylinder # - Assistance Req'd

I need some assistance from the VAF braintrust regarding an issue on my IO540 powered RV-10

I just finished my phase one and wanted to take my son flying. After completing the 40 hours I landed, turned the airplane around and did my first hot start in the plane. First thing I noticed was low fuel pressure and assumed it was due to vaporization. Running the fuel pump on the ground seemed to fix that. A few of the cylinders got hot during taxi, 420 CHT or so but nothing too high. They came back down with a fast taxi.

Once airborne I noticed both CHT and EGT on cylinder #2 stayed way high. EGT was in the 140-14200 range, a good 200 degrees above any other cylinder. The CHT was in the 405-410 range, again well above others. It leveled there and did not move a lot and di not continue to climb. I cut the flight short. In the pattern and at taxi back (low power settings) the temperatures were back in line with others.

Yesterday I figured I would take a trip or two around the pattern and see what the temps did. All normal on taxi out and run up. As soon as I applied full power #2 spiked again and again leveled around 1400 degrees EGT. I finished the lap in the pattern and shut it down. A few hours later all temps in all cylinders measured the same at ambient.

I assume it is not a sensor as both EGT and CHT's were high for that cylinder.

Did I damage a plug, burn a valve or?

Your thoughts are much appreciated

Thanks
E
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  #2  
Old 11-08-2019, 09:00 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,597
Default

Go LOP and see if #2 peaks at a significantly higher fuel flow than the other cylinders. If so, that cylinder is getting less flow than normal - perhaps a clogged injector.

If you never took data doing a GAMI spread, now is a good time.

Carl
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  #3  
Old 11-08-2019, 09:15 AM
bsvantho bsvantho is offline
 
Join Date: Oct 2012
Location: Rochester Hills, MI
Posts: 58
Default

Quote:
Originally Posted by Carl Froehlich View Post
Go LOP and see if #2 peaks at a significantly higher fuel flow than the other cylinders. If so, that cylinder is getting less flow than normal - perhaps a clogged injector.

If you never took data doing a GAMI spread, now is a good time.

Carl
It may also be a blockage at the flow divider. I had this happen during break-in of my IO-540. If you have Airflow Performance injection the manual covers checking the flow as well as cleaning the flow divider.
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  #4  
Old 11-08-2019, 09:24 AM
ethand ethand is offline
 
Join Date: Mar 2013
Location: San Diego
Posts: 189
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The more I am reading the more I am thinking fuel flow. I do have the AP FL-150 so I will look at that troubleshooting.

E
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RV-10 N77319
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Phase 1 completed Nov 2019
95 hours and counting.....
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  #5  
Old 11-08-2019, 09:39 AM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Sure sounds like fuel flow is restricted to that cylinder.
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Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

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  #6  
Old 11-10-2019, 07:12 PM
ethand ethand is offline
 
Join Date: Mar 2013
Location: San Diego
Posts: 189
Default Closing the Loop

Reporting back the issue has been resolved.

I did the fuel flow testing and found two different cylinders (including the #2 cylinder with the issue) to not have a steady stream but rather a steady drip. From a flow perspective it was very similar to the other injectors over 5 min but obviously not a stream. Removed the nozzles and indeed found debris in both. Cleaned up, put back together and all back to normal.

Thanks for the input

E
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RV-10 N77319
2192 Days of Building
Completed May 2019
Phase 1 completed Nov 2019
95 hours and counting.....
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  #7  
Old 11-10-2019, 09:11 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Debris in two seems like too much of a coincidence. I?d pull the spider ,and the screen on the fuel injection control unit, check for debris.
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