Cold Cylinder

Pablo Canales

Pablo Canales

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Dec 31, 2021
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Pablo
Hi Guys!
I’m flying a Cessna 205 with a Continental IO-550 in it.

My CHT’s readings are similar except Cylinder 6

c1 390°F
c2 380°F
c3 365°F
c4 350°F
c5 370°F
c6 214°F

Is this something I should be worried about?
Is 200°F too cold for a Cylinder?

The airplane just came out of the last 200hours inspection.
Compressions and spark plugs are in good shape.

I live in Cancun, Mexico where temperatures are always above 80°F

Also JPI CHT probes are reasonably new
 
Had similar in my O-360, turned out to be a loose probe.
 
Probably a probe that isn't reading correctly. I'd be a little concerned with a couple of those higher temps. But that's just me ...
 
That front cylinder gets a lot more cooling than the rest. However, I had to replace a JPI probe after install due to a faulty reading. check those first.
 
To answer part of your question, yes, 200 degrees is too cold for a cylinder.

You may want to look at the Savvy Aviation website and read some of the articles/webinars on low cht's.
 
Shooting it with an IR gun and comparing all jugsmay help.
 
That definitely sounds like a good idea, I’ll go get an IR gun to check them out

Could faulty valves be the cause?


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At 80F OAT with the cylinder firing, I'm not sure the CHT could get that low. I suspect the probe. Swap as suggested by kyleb in post #2.
 
Please let us know the results of the probe swap.
 
Good news guys!

I found a New CHT probe in my garage, which I proceeded to install immediately.

And the results are great, everything is back to normal

All Temps are now indicating around 380°F (which I know are hot, but at least they make sense)


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Thanks for the update.
 
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