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For those who installed a CHT gauge

Did you install CHT with the sensor located under the spark plug? If so, what sensor you used and what did you have to do to make it fit? Seemed there is virtually no room for the sensor in the spark plug hole.

Here is the sensor I am thinking of.

Dakota Digital - Digital Instrumentation and Accessories

thanks,
anthony

Old 10-14-2010, 01:07 PM
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You either bend the tab after slipping it over the plug or attach it to a bolt near the head.
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Old 10-14-2010, 01:13 PM
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Quote:
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You either bend the tab after slipping it over the plug or attach it to a bolt near the head.
Does the sensor (after you bend it) fit into the spark plug hole? Seemed there is virtually no space for the crimp on the sensor in there.
Old 10-14-2010, 01:33 PM
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It did on my 3.6....
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Old 10-14-2010, 02:33 PM
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Quote:
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It did on my 3.6....
What CHT sensor & setup did you use?
Old 10-14-2010, 02:39 PM
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I had a custom Westach CHT/Volt meter made to replace my clock. The termocouple resembled the one you posted a link to.

If YOU can't get it in with the plug, bolt it to something near the head. It will give you close to the reading you need....
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Old 10-14-2010, 02:43 PM
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Search out RoninLB....he has a CHT and EGT both installed....I think he has a serious small aircraft background. Might be able to give good advice on this topic.
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Old 10-14-2010, 03:03 PM
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I think RoninLB (or somebody, anyway) had a CHT gauge in the cabin, and thermocouples under each spark plug. The CHT was switchable, so he could see all six cylinder head temperatures.
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Old 10-14-2010, 03:06 PM
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I like Ronin's setup. I am doing thinking of doing similar with the aircraft MGL TC1.

I am just worried whether the sensor would work.

I am also thinking of mounting the Sensor to the exhaust stud hole. 993s head have 2 extra holes. But don't know if that will give an accurate reading.
Old 10-14-2010, 03:15 PM
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Westach does mostly aircraft gauges. The price was very reasonable.
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Old 10-14-2010, 03:23 PM
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Quote:
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Westach does mostly aircraft gauges. The price was very reasonable.
Look for one made for experimental airplanes. A certified gauge will be too expensive.

I may have one if anyone is interested. Its a single probe unit but works fine. Also have a EGT or two... course being an aircraft mechanic helps!
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Old 10-14-2010, 03:43 PM
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What about this one? Only $40 will give you digital display and user settable alarm.

12V Smart Digital PID Temperature Control Controller - eBay (item 350270131766 end time Oct-20-10 22:17:37 PDT)
Old 10-14-2010, 06:04 PM
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$80 if I recall...


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Old 10-14-2010, 06:34 PM
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Quote:
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$80 if I recall...


THAT'S COOL! And functional.
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Old 10-15-2010, 05:30 AM
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I had them put two "Idjut Lites" in there as well. One for the belt failure sensor and CHT overheat warning. None have ever lit up except at start up.

They were surprisingly accomodating for my needs. The gauge was a little smaller than the clock but an extra gasket filled the hole and it hasn't moved. Not quite the match to the VDO gauges but close.
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Old 10-15-2010, 07:42 AM
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Quote:
Originally Posted by Joe Bob View Post
I had them put two "Idjut Lites" in there as well. One for the belt failure sensor and CHT overheat warning. None have ever lit up except at start up.

They were surprisingly accomodating for my needs. The gauge was a little smaller than the clock but an extra gasket filled the hole and it hasn't moved. Not quite the match to the VDO gauges but close.
Wow!!! How do you wire up the cht overheat warning? User settable warning temperature? Or did they put in the circuitry for you? Do they also do a compensated gauge upon request?
Old 10-15-2010, 07:47 AM
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I installed an inline thermostat that had an adjustable reostat. I have it set at 400F.

It's kinda clunky but it works. I found an online wiring diagram. It's been in for a few years....out of site out of mind.
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Old 10-15-2010, 07:55 AM
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CHT Gauge solution

Here was a way I worked out a CHT gauge for my 66 912. As a sideline, I have been making a system for measuring CHT and other critical engine temperatures. There are many permutations of this "work in process"... some use a small external digital display that can be mounted anywhere on the dash, and for those not against some modification (which can be reversed back to stock) I make a display module that can install in the window of an existing gauge as shown in some of the photos. The "sensor" thermocouple is a ring that goes under the spark plug and indeed this can be a bit difficult to get placed just right as it is hard to "see" down into the recessed area in the cooling fins. But, I found with a little finesse, it is possible to position the sensor just right. I suppose mounting to a suitable bolt on the cylinder head is also a reasonable option. It is pretty interesting to watch cylinder head temps under various driving/load conditions. There's a lot going on in there!!

If you have interest in this approach, you can PM me and I'll send you more detailed info about my measurement system.




Old 10-15-2010, 09:20 AM
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