Cylinder Head Temperature Gage Not Working? - ED Forums
 


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Old 05-14-2019, 11:17 PM   #1
Balzarog
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Default Cylinder Head Temperature Gage Not Working?

I’ve noticed on startup that the cylinder head temperature (CHT) gage is pegged at 150 before starting the engine, and doesn’t move at all while the engine is running on the ground or in flight. This could be a problem since the specs require we keep the CHT above 125 degrees C during flight. Has anyone else noticed this? I would expect the CHT to be ambient temperature during a cold start and gradually rise to the 150 degrees C as it warms up.
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Old 05-15-2019, 02:07 PM   #2
Ala13_ManOWar
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Nope, moving for me since Start-up and in flight.


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Old 05-15-2019, 02:15 PM   #3
grafspee
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i have no problem hiting red line in temps
it is big engine it take time to warm up
1200rpm is warm up for the engine if you try warmup at low rpm it can take lot of time

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Old 05-15-2019, 11:04 PM   #4
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Before I start up, and all during the warm up, the needle of the CHT gage sits just above 150. Last night, as I was doing an “Instant Action” free flight, my engine died as I was trying to get the hang of a proper controls setup for raising and lowering the gear. When I scanned the gages to figure out why the engine died, I noticed that the CHT needle was below 120 (Caution, do not allow CHT to drop below 125 ....). So, it appears that the gage does in fact work. I posted my original question after having seen it before starting, during warm up and early flight only.

I’ve been a U.S. Federal Aviation Administration licensed airframe and powerplant mechanic for 44 years, and I must say that I have never seen a temperature gage that indicated at the top of it’s range before startup, and that didn’t move during a 30-minute warm up, so I stand by my thought that the CHT gage is bugged.
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Old 05-15-2019, 11:31 PM   #5
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Quote:
Originally Posted by grafspee View Post
i have no problem hiting red line in temps
it is big engine it take time to warm up
1200rpm is warm up for the engine if you try warmup at low rpm it can take lot of time
The I-16 has two gages that show temperature. The gage on the left side of the instrument panel is a triple indicator gage that shows oil temp (the outside register) the oil pressure ( left inside indicator), and fuel pressure (right inside indicator). Oil temp is controlled by the oil cooler lever on the right side of the cockpit. The gage on the right side of the instrument panel is the cylinder head temperature (CHT) that shows the temperature of the cylinder head (obviously) which is regulated by the cowl flap lever above the oil cooler lever. For a true cold start (engine at ambient outside temperature), the oil temp and CHT gages should show the ambient air temp, not the max of the gage. I suspect that you see the oil temp gage changing during warm up, not the CHT since the the CHT is already indicating 150 and has no where to move other than down.
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Old 05-16-2019, 12:40 AM   #6
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It's possible they have working CHT's and you have a busted install or some other DCS weirdness. The fact that 2 separate people say their CHT works (and presumably you are all on the same Build), probably means DCS has DCSed on you.
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Old 05-16-2019, 12:54 AM   #7
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Quote:
Originally Posted by RustBelt View Post
It's possible they have working CHT's and you have a busted install or some other DCS weirdness. The fact that 2 separate people say their CHT works (and presumably you are all on the same Build), probably means DCS has DCSed on you.
It is possible, I will do a repair and test it again to determine if there is an issue.
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Old 05-17-2019, 12:50 PM   #8
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I believe I have the same issue with the CHT gauge.
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Old 05-19-2019, 02:21 PM   #9
fjacobsen
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The gauge that stops at 15 is the fuel gauge. It indicates fuel amount in 10xKg - so 15 is 150 Kg fuel.
Note that the tanks can take more than 150 kg's (~190 kg), so the needle won's start to drop before appr. 20% fuel has been used.

Above the fuel gauge is the CHT gauge, which ends at 350 - and it´s working - i.e indicates OAT when starting from cold and dark and normally settles around 200°C depending on power setting and cowl flap opening.
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Old 05-20-2019, 03:14 AM   #10
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Quote:
Originally Posted by fjacobsen View Post
The gauge that stops at 15 is the fuel gauge. It indicates fuel amount in 10xKg - so 15 is 150 Kg fuel.
Note that the tanks can take more than 150 kg's (~190 kg), so the needle won's start to drop before appr. 20% fuel has been used.

Above the fuel gauge is the CHT gauge, which ends at 350 - and it´s working - i.e indicates OAT when starting from cold and dark and normally settles around 200°C depending on power setting and cowl flap opening.
Ah, thank you very much! That solves the issue. I thought it was the other way around, and that I was looking at the CHT gage. Wouldn’t be the first time this old brain got confused, and it definitely won’ be the last
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Last edited by Balzarog; 05-20-2019 at 03:22 AM.
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