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1. 05:00 AM - Re: CHT (Anthony Savarese)
2. 10:12 AM - Re: CHT (Mark Bitterlich)
Message 1
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Split the CHT probes between cylinders 3 & 4. With both probes on the same spark
plug, the spark plug firing tip is significantly pulled out of the combustion
chamber. Also, regardless of whether youre using a Russian/Chinese or automotive
spark plug, the plug with the CHT prob should not have a washer on it as
that exasperates the issue just mentioned.
Dennis
Sent from my iPhone
> On Jul 8, 2023, at 9:42 PM, Snazpappy <snazman1@hotmail.com> wrote:
>
>
> I have a Yak 52 TW. The CHT in the back cockpit is mostly inop indicating zero.
After engine startup I noticed the CHT in the rear cockpit would indicate
normally up through about 200 degrees then the gauge would appear to fail and
indicate bottom of the scale. I did a little troubleshooting today and put both
CHT probes in my dewalt heat gun which can be set in 50 degree increments.
Both gauges read normal up to about 200 degrees F. When the heat was increased
beyond 200 degrees, the rear gauge appeared to fail and the front gauge read
normally. I decided to isolate the rear CHT probe so I put just one probe
in the heat gun to find which was the rear and found the rear gauge continued
working when it was isolated but would read 50-100 degrees lower then the set
heat, when set above 200 degrees, but the gauge continued to function. I then
tried to put the front probe back in the gun, with the rear probe and as soon
as I put the two probes together the rear gauge again!
> appeared to fail.
>
> Both CHT thermocouple are pancaked together and put on the same spark plug on
the back of the engine. I have decided for now to replace both thermocouples
to see if this fixes the problem, not sure what the problem may be, and was wondering
if anyone has any ideas why my gauges are acting this way. I checked
the wiring diagram and both thermocouples are totally isolated from each other
other than be pancaked on the same plug. Both thermocouple s wiring are running
through their own protective sleeves.
>
> Any ideas or suggestions are appreciated.
>
> Thanks
>
> Todd
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=511077#511077
>
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>
Message 2
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