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  #1  
Old 04-16-2021, 02:07 PM
design4p design4p is offline
 
Join Date: Jul 2018
Location: CORWEN
Posts: 59
Default What CHT's and EGT's is normal Range

Hi,

I'm in the process of test flying and my CHT's are in the region of 155 degrees Celsius (310 degrees Fahrenheit) and my EGT's in the region of 680 degrees Celsius (1200 degrees Fahrenheit).

I have the standard RV14A setup Lycoming 390 engine with all Garmin avionics, G3X, Garmin Sensors etc.

It would be good to know the expected range of temperatures as these appear quite low.

Regards John
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  #2  
Old 04-16-2021, 02:16 PM
Aussieflyer Aussieflyer is offline
 
Join Date: Jan 2015
Location: Redcliffe, Queensland, Australia
Posts: 83
Default Same Same

They are the cruise temps I have been getting for the last four years (450 hours) in my RV14A
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  #3  
Old 04-16-2021, 02:23 PM
BH1166 BH1166 is offline
 
Join Date: Nov 2017
Location: Eatonton Georgia
Posts: 409
Default Sorry

Not enough data to say, but generally those numbers are great. You owners manual from lycoming has your CHT params. EGT, used to troubleshoot and in leaning, so really no wrong # ..... depends on many factors. Enjoy your 14.
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  #4  
Old 04-16-2021, 04:42 PM
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DanH DanH is offline
 
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Location: 08A
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Default

The CHTs are fine for cruise. Lower airspeed tells the tale in climb, resulting in higher CHT and oil temperature.

There is no "correct" EGT number. EGT on a non-turbo Lycoming is a reference, not a warning. It indicates mixture via the relationship between peak EGT and the EGT indicated under the given conditions. Best power is found about 65C (150F) on the rich side of peak EGT. Lycoming recommended economy cruise is peak EGT, a setting which offers fuel savings with limited or no airspeed loss. For maximum economy without regard for the airspeed loss, you may go as far as you wish on the lean side of peak, as long as it remains smooth.

Your cruise CHT is so low I'd recommend you try leaning to peak EGT at full throttle above 9500 ft.
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  #5  
Old 04-16-2021, 05:08 PM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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Default

Quote:
Originally Posted by DanH View Post
SNIP

Your cruise CHT is so low I'd recommend you try leaning to peak EGT at full throttle above 9500 ft.
+1. Your EGTs suggest you are flying around at full rich. Not good for your wallet or your engine (plug fouling, stuck exhaust valve, etc.).

If you CHTs remain that low at leaner mixtures it suggests you have excess cooling - so excess engine cooling air drag.

Mike Busch has a video discussing the “Sweet Spot” for CHTs, above 350 but below 400 (Lycoming engines). He explains why cooler CHTs is not always better.

https://www.eaa.org/Videos/Webinars/.../6178810783001

Carl
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  #6  
Old 04-16-2021, 05:14 PM
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jcarne jcarne is offline
 
Join Date: Jul 2016
Location: Worland, Wyoming
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Default

Quote:
Originally Posted by Carl Froehlich View Post
+1. Your EGTs suggest you are flying around at full rich. Not good for your wallet or your engine (plug fouling, stuck exhaust valve, etc.).

If you CHTs remain that low at leaner mixtures it suggests you have excess cooling - so excess engine cooling air drag.

Mike Busch has a video discussing the “Sweet Spot” for CHTs, above 350 but below 400 (Lycoming engines). He explains why cooler CHTs is not always better.

https://www.eaa.org/Videos/Webinars/.../6178810783001

Carl
Also on YouTube here if you don't have a membership. Although I am betting you do. I highly recommend a membership if you don't.
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  #7  
Old 04-16-2021, 05:33 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
+1. Your EGTs suggest you are flying around at full rich. Not good for your wallet or your engine (plug fouling, stuck exhaust valve, etc.).
Not correct as far as I understand. Absolute values mean almost nothing for EGT. They are highly dependent upon probe placement, for example. It could just be that the OP’s probes are a ways down the exhaust. As Dan mentions above, they are important really only in relative terms to where a particular cylinder’s EGT peaks.
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  #8  
Old 04-18-2021, 01:41 PM
Arablenz Arablenz is offline
 
Join Date: Dec 2014
Location: South Island ,New Zealand
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Interesting video with Mike Busch, thanks.
My RV 14 is at 70 hrs and in cruise depending on OAT is often around 300 CHT so quite low relative to Mikes’ 350 to 400.
What have others done to increase CHT’s?
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  #9  
Old 04-18-2021, 02:41 PM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by Arablenz View Post
Interesting video with Mike Busch, thanks.
My RV 14 is at 70 hrs and in cruise depending on OAT is often around 300 CHT so quite low relative to Mikes’ 350 to 400.
What have others done to increase CHT’s?
What kind of ignition do you have? Put an EI on there that advances the timing and it will jump up for sure!
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  #10  
Old 04-19-2021, 02:24 AM
Arablenz Arablenz is offline
 
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Standard mags.
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