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High EGT on #2 Cylinder

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tgesele(at)optonline.net
Guest

Posted: Fri Oct 16, 2009 6:43 am Post subject: High EGT on #2 Cylinder

During flight testing, the EGT on the #2 cylinder is running consistently higher (~75-90 deg) than the others. I've flown the plane with / without the wheel pants and noticed temperature jumped with them on at the same power setting. Based on this, I'm assuming that it has something to do with the vent in the injector port (I'm running the AFP unit) leaning the mixture in that cylinder more than the others. Has anyone else run into this? Any suggestions on how to even them out? 

 Thanks,

  Tom Gesele N629RV - Phase I

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Fri Oct 16, 2009 7:12 am Post subject: High EGT on #2 Cylinder

That's what all that talk was a few weeks ago about putting a

blocking plate in front of the injector, to block the air.

This is especially a concern with the James Cowl.



Tim Olson - RV-10 N104CD



tgesele(at)optonline.net wrote:

 	  Quote: 	
		   During flight testing, the EGT on the #2 cylinder is running 

 consistently higher (~75-90 deg) than the others. I've flown the plane 

 with / without the wheel pants and noticed temperature jumped with them 

 on at the same power setting. Based on this, I'm assuming that it has 

 something to do with the vent in the injector port (I'm running the AFP 

 unit) leaning the mixture in that cylinder more than the others. Has 

 anyone else run into this? Any suggestions on how to even them out? 

 Thanks,

   Tom Gesele N629RV - Phase I

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ricksked(at)embarqmail.co
Guest

Posted: Fri Oct 16, 2009 7:15 am Post subject: High EGT on #2 Cylinder

Are you running the front cylinder baffels at the stock size? I had to trim mine down a little at a time, made a big difference.

---

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ricksked(at)embarqmail.co
Guest

Posted: Fri Oct 16, 2009 7:15 am Post subject: High EGT on #2 Cylinder

Give Don a call at Airflow, He will want some flight data (temps) on all your cylinders along with answer your questions. They hold a class on how to tune them I think once a year I hear is VERY good.

---

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Fri Oct 16, 2009 7:40 am Post subject: High EGT on #2 Cylinder

I had some wierd readings on my sensors when I started flying. If the engine is running smoothly, my first suspicion would be to check the sensor itself. Swap the sensor from #2 to #4 and then fly. If the high reading persisits - it is a defective sensor. Also as the prior post said - cut down the wind dam in front.

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_________________
See you OSH '18
Q/B - sold.

carl.froehlich(at)verizon
Guest

Posted: Fri Oct 16, 2009 8:20 am Post subject: High EGT on #2 Cylinder

Remember that EGT is only a relative indication of exhaust temperature.  Since the actual reading is highly dependent on the probe and probe location, comparing EGTs between cylinders should only be done for specific operating aspects, such as comparing fuel flow between each cylinder as each cylinder reaches peak.  The absolute EGT readings between cylinders is only useful for gross problems such as a cylinder not firing.  More important is the CHT readings between cylinders and where each cylinder is operating related to peak EGT for that cylinder.  

   

Recommend you take data (fuel flow, CHTs) on when each cylinder peaks.  If you get cylinder EGTs between 20-40 degrees ROP or LOP, then you should be in good shape.  A LOP example is the last cylinder to peak being at 20 degrees below its highest temperature with the first cylinder to peak being 40 degrees below its highest temperature.  

   

On my 8A, #4 cylinder is always the last to peak – being about 0.1 - 0.2 gals/hr lower at peak than the first cylinder to peak but still in the 20-40 degree range.  I replaced the injector (Air Flow Performance) on that cylinder with one that is .001” smaller, but it made that cylinder peak very early.  I’ll need to call AFP to see if they have another size perhaps only .0005” smaller.  

   

If you end up with CHTs being much different but fuel flow at EGT peaks are about the same, then it is time to look at air damns and such.  

   

Carl Froehlich  

RV-8A (525 hrs)  

RV-10 (still doing fuselage “make it pretty” fiberglass stuff)  

   

   

     

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of tgesele(at)optonline.net

 Sent: Friday, October 16, 2009 10:11 AM

 To: rv10-list(at)matronics.com

 Subject: High EGT on #2 Cylinder  

  

     

During flight testing, the EGT on the #2 cylinder is running consistently higher (~75-90 deg) than the others. I've flown the plane with / without the wheel pants and noticed temperature jumped with them on at the same power setting. Based on this, I'm assuming that it has something to do with the vent in the injector port (I'm running the AFP unit) leaning the mixture in that cylinder more than the others. Has anyone else run into this? Any suggestions on how to even them out?   

    

Thanks,

   Tom Gesele N629RV - Phase I  

  

        [quote][b]

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Fri Oct 16, 2009 2:10 pm Post subject: High EGT on #2 Cylinder

Twice a year - May and November.Â  Next class is in three weeks (Friday/Saturday/Sunday).Â  I will be there.  

   

John   

#600 of 1,000  

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Rick Sked

 Sent: Friday, October 16, 2009 8:06 AM

 To: rv10-list(at)matronics.com

 Subject: Re: RV10-List: High EGT on #2 Cylinder  

  

  

     

Give Don a call at Airflow, He will want some flight data (temps) on all your cylinders along with answer your questions. They hold a class on how to tune them I think once a year I hear is VERY good.

 ---

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