Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Broken EGT probe

Matronics Email Lists Forum Index -> Kitfox-List

View previous topic :: View next topic

Author Message

wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Sun Nov 04, 2007 2:55 pm Post subject: Broken EGT probe

I lost my EGT readings on my last flight. Checking the probe, I noticed that it seems to have come apart near the point where it enters the pipe. I have Westach combination gage and I was wondering if I need to replace the probe with a Westach probe or if any EGT probe will do.

_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

kitfoxpilot(at)msn.com
Guest

Posted: Sun Nov 04, 2007 4:08 pm Post subject: Broken EGT probe

I don't know if this is true or not, but I read someplace that the rotax 912 does not need an EGT, but you do need the CHT, oil temp and oil pressure!  I'm no expert!!

  

 Ray



 	  Quote: 	
		   Subject: Broken EGT probe

 From: wingnut(at)spamarrest.com

 Date: Sun, 4 Nov 2007 14:55:11 -0800

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "wingnut" <wingnut(at)spamarrest.com>

 

 I lost my EGT readings on my last flight. Checking the probe, I noticed that it seems to have come apart near the point where it enters the pipe. I have Westach combination gage and I was wondering if I need to replace the probe with a Westach probe or if any EGT probe will do.

 

 --------

 Luis Rodriguez

 Model IV 1200

 Rotax 912UL

 Flying Weekly

 Laurens, SC (34A)

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=143849#143849

 

 

 

 

 ====

 

 

 


	


Climb to the top of the charts!  Play Star Shuffle:  the word scramble challenge with star power. Play Now!  [quote][b]

wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Sun Nov 04, 2007 4:39 pm Post subject: Re: Broken EGT probe

 	  Quote: 	
		  I don't know if this is true or not, but I read someplace that the rotax 912 does not need an EGT, but you do need the CHT, oil temp and oil pressure! I'm no expert!! 	




Hmm. That would be interesting. I don't have CHT but I have EGT...  Anyone else running with no CHT?

_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

Sbennett3(at)aol.com
Guest

Posted: Sun Nov 04, 2007 4:52 pm Post subject: Broken EGT probe

Isn't CHT water temp for a 912 ???  I heard  the same about egt... Not necessary for a 4 stroke.  Although mine has it  too.  Steve Bennett  Durham NC





  [quote][b]

kitfoxpilot(at)msn.com
Guest

Posted: Sun Nov 04, 2007 5:03 pm Post subject: Broken EGT probe

As far as I know you don't need the EGT probe! I have one because the original builder installed one.  However, CHT which monitors the temps on the cylinder head is important.  I remember viewing the rotax dvd I got a few months ago.

  

 Ray



 	  Quote: 	
		   Subject: Re: Broken EGT probe

 From: wingnut(at)spamarrest.com

 Date: Sun, 4 Nov 2007 16:39:26 -0800

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "wingnut" <wingnut(at)spamarrest.com>

 

 

 > I don't know if this is true or not, but I read someplace that the rotax 912 does not need an EGT, but you do need the CHT, oil temp and oil pressure! I'm no expert!! 

 

 

 Hmm. That would be interesting. I don't have CHT but I have EGT... Anyone else running with no CHT?

 

 --------

 Luis Rodriguez

 Model IV 1200

 Rotax 912UL

 Flying Weekly

 Laurens, SC (34A)

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=143863#143863

 > 

 

 


	


Climb to the top of the charts!  Play Star Shuffle:  the word scramble challenge with star power. Play Now!  [quote][b]

Vic Baker

Joined: 11 Jan 2006
Posts: 71
Location: Carson City, Nevada

Posted: Sun Nov 04, 2007 5:05 pm Post subject: Broken EGT probe

Interesting topic.  Six months ago, when I was  designing my panel, I ask Lockwood about EGT.  He said "forget that".   And so I did.

  

  

 Vic Baker

S7 912S Warp 95%

Carson City, Nv

 [quote]   ---

_________________
Vic Baker
Series 7
Carson City, Nevada

runwayrex(at)juno.com
Guest

Posted: Sun Nov 04, 2007 5:27 pm Post subject: Broken EGT probe

Another viewpoint.............I have four EGT probes on my 912 feeding into a four position switch that feeds the gauge. I don't concern myself too much with it during normal conditions, but it sure comes in handy when troubleshooting a problem. Being able to switch to each cylinder's EGT individually narrows things down quite quickly. 

Rex in S.E Michigan / 912 UL / Warp / Model 3 / 628 Hours 

-- "Vic Baker" <vr_baker(at)nvbell.net> wrote:

 Interesting topic.  Six months ago, when I was designing my panel, I ask Lockwood about EGT.  He said "forget that".  And so I did.

  

  

 Vic Baker

S7 912S Warp 95%

Carson City, Nv

 [quote] ---

kerrjohna(at)comcast.net
Guest

Posted: Sun Nov 04, 2007 5:59 pm Post subject: Broken EGT probe

I don't know if this is true or not, but I read someplace that the rotax 912 does not need an EGT, but you do need the CHT, oil temp and oil pressure!  I'm no expert!! 

Luis, I rely heavily on the relative EGT readings to guide the seasonal changes to the main jets on my 912.  I can not imagine flying without. I check it every flight every time I change the throttle setting to be aware of how the engine is operating.

 

I would recommend going with the westach probe to maintain and "apples" comparison. 

John Kerr, approaching 800 hours.   

 [quote]  

  

  	  Quote: 	
		  -------------- Original message -------------- 

From: RAY Gignac <kitfoxpilot(at)msn.com> 

  .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma }  I don't know if this is true or not, but I read someplace that the rotax 912 does not need an EGT, but you do need the CHT, oil temp and oil pressure!  I'm no expert!!

 

Ray



 	  Quote: 	
		   Subject: Broken EGT probe

 From: wingnut(at)spamarrest.com

 Date: Sun, 4 Nov 2007 14:55:11 -0800

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "wingnut" <wingnut(at)spamarrest.com>

 

 I lost my EGT readings on my last flight. Checking the probe, I noticed that it seems to have come apart near the point where it enters the pipe. I have Westach combination gage and I was wondering if I need to replace the probe with a Westach probe or if any EGT probe will do.

 

 --------

 Luis Rodriguez

 Model IV 1200

 Rotax 912UL

 Flying Weekly

 Laurens, SC (34A)

 

 

 

 

 Read this topic online here:

 

 http://f  orums. matronics.com/viewtopic.php?p=143849#143849

 

 

 

 

 ====

 

 

 


	




  Climb to the top of the charts! Play Star Shuffle: the word scramble challenge with star power. Play Now!  	  Quote: 	
		  

	
	
[b]

wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Sun Nov 04, 2007 6:18 pm Post subject: Re: Broken EGT probe

 	  Quote: 	
		  Interesting topic. Six months ago, when I was designing my panel, I ask Lockwood about EGT. He said "forget that". And so I did. 	




I guess things just got more complicated for me then. The gage I have is a combo gage with EGT, Water Temp, Oil Temp and Oil pressure. There's no room in my panel for a new gage so I guess I'd have to find a similar gage with CHT instead of EGT.  That's going to pinch a bit more than a new probe. Bummer.

_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

lcfitt(at)sbcglobal.net
Guest

Posted: Sun Nov 04, 2007 7:15 pm Post subject: Broken EGT probe

Luis,



The water temp is equivalent to the CHT since the cylinders are water 

cooled.  You are fine.  I had the EGT as well, but seldom looked at it.  I 

didn't have the convenience John has with one on each exhaust stack.  My 

thought is, and consider that my airplane is sitting in a salvage yard 

somewhere. is that rather than having a dead gauge staring you in the face 

every flight.  I'd pony up for the new sender and then the needle would be 

in the proper range on the gauge face.  I sure liked the look of all the 

needles in the middle of the green.  Until the last flight, I mean.



Lowell



---

john(at)leptron.com
Guest

Posted: Sun Nov 04, 2007 8:17 pm Post subject: Broken EGT probe

Luis I may have a spare probe for the westac, give me a day to look at the

hanger.... its free



John Oakley



--

Jim Shumaker

Joined: 09 Jan 2006
Posts: 106

Posted: Sun Nov 04, 2007 9:58 pm Post subject: Broken EGT probe

Luis

  

 The water temperature is the cylinder head temperature.  Rotax engines come with a sensor (or two) already installed in the cylinder head.  That is correct location to take a temperature reading that you can call a cylinder head reading.  There is actually not enough room to install a standard cylinder head temp sensor under the spark plug.  When I built my plane, the water temperature gauge was installed in the spyder tank.  This is a pretty accurate reading for the water temperature and thus the cylinder head temperature.  It is actually more accurate to use the sensor in the cylinder head for those rare instances when the cylinder boils the coolant and then with the sensor in the head you will get a warning of a problem.  The instructions that came with the engine (1994 era) actually had the water temp in the spyder and the oil temp in  the dry sump.  The dry sump oil sensor is a measure of the bypass gases and is not even close to the oil temp so that sensor was relocated.  Then an oil cooler had to be installed because the actual oil temps were much higher than recorded in the dry sump.  The point is that the water temp sensor you have will be fine, especially if it is connected to the sensor in the cylinder head.

  

 Jim Shumaker

 Salinas, CA

 Kitfox III, 912ul, 835 hours

 ---

_________________
Jim Shumaker

wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Mon Nov 05, 2007 5:03 am Post subject: Re: Broken EGT probe

Wow. Problem solved. Thanks guys

_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

Fox5flyer
Guest

Posted: Mon Nov 05, 2007 5:22 am Post subject: Broken EGT probe

Personally, one can get along without EGT, CHT, oil temp, fuel pressure,  oil pressure, fuel flow, and even fuel gauges, but I find them very nice to have  for reference.   We know what is normal for our airplanes and when any  one of them begins to change it gives us early warning that something isn't  right.  

 Deke Morisse

 S5, NE Michigan

  

 [quote]   ---

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Nov 05, 2007 2:59 pm Post subject: Broken EGT probe

I would expect both instruments have advantages and  are worth having.



CHT tells you how hard your engine is working and when  it is working too hard.



EGT tells you how the tune of your engine  is.  Whether it is too lean or too rich.



 Most of the  instruments used in amateur built planes really need some calibration and that's  where the fun comes in. 



The EGT can be calibrated by looking at the  spark plugs...  Once the plugs are giving a nice tan colouration what ever  the EGT has been reading is optimal for you.



When flying you keep an eye  on the CHT too.  If it unexpectedly starts to climb you may have a  problem.... Land and get it checked out.  Obviously when you are climbing  WOT or close to WOT then you will be generating a bit more heat and you should  be able to see this in your CHT.  Remember the cylinder heads are liquid  cooled so a noticeable increase in CHT can mean a problem with your liquid  cooling system.



Personally, a little off topic, I hate idiot  lights.  Gauges tell the whole story at a glance the thing to remember is  not to fixate on the EGT, or any instrument for that matter, and fly de  plane!  There are few idiot lights on planes, they're called enunciator  panels.  They will draw your attention to a problem.   The gauges  will tell the story of the problem.  I once had someone take the oil light  out of a car because it was glaring in their eyes.  The engine ran through  a ten hour road rally with no oil in the base.  Some how I didn't lose the  engine!



 

[img]cid:207294722(at)05112007-079B[/img]  

 Noel Loveys, RPP, AME intern

 Campbellton, Newfoundland, 

 Canada

 Kitfox Mod III-A, 582, B box, Ivo IFA

 Aerocet 1100s

 noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)

 

 

  

 

[quote] --

Signature1.jpg

Description:

Filesize:

19.77 KB

Viewed:

363 Time(s)

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Nov 05, 2007 3:11 pm Post subject: Broken EGT probe

In your case the Water Temp is your cylinder head temp.... The hear is

liquid (water) cooled.  Temp is the temp of the liquid leaving the heads.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Mon Nov 05, 2007 5:05 pm Post subject: Re: Broken EGT probe

One issue I've always had with the EGT readings is that during normal cruise on a cold day, it normally reads near the top of the gage (around 1450). The gage only reads to 1500 so there's not much movement there for me to pick out a problem. Is this consistent with what others are reading?

 	  Quote: 	
		  When flying you keep an eye on the CHT too. If it unexpectedly starts to climb you may have a problem.... Land and get it checked out. Obviously when you are climbing WOT or close to WOT then you will be generating a bit more heat and you should be able to see this in your CHT. Remember the cylinder heads are liquid cooled so a noticeable increase in CHT can mean a problem with your liquid cooling system.

_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

Display posts from previous:

	Matronics Email Lists Forum Index -> Kitfox-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum