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Posted by: Charles Freeborn Jan 3 2020, 08:26 PM

Opinions? Thermo couple vs ?? Spark plug sender vs NPT... which cylinder? I've got questions!

Posted by: yeahmag Jan 6 2020, 04:53 PM

#3 is the cylinder to watch using the sender that goes under the plug. A Micro 1000 is what I run because it is temp compensated and looks right on my dash.

https://www.aircraftspruce.com/catalog/inpages/CHT_gauges.php

In the future I may switch to this (link below) due to some additional features, like alerts:

http://thesensorconnection.com/cht-sensors/all-cht-sensors/cht-digital-pyrometer-gauge-cht-cylinder-head-temperature-sensor-kit-fs

Posted by: GregAmy Jan 6 2020, 09:31 PM

If you're into data acq, this guy has one with a 0-5VDC output. Uses any K type thermocouple.

Might add one of those to the race car...

Posted by: Charles Freeborn Jan 7 2020, 03:50 PM

This is the second rec for the aircraft style. One question - thought. How important is the temp compensation aspect in a sea-level vehicle? I understand the need in an aircraft situation where the ambient temps could swing radically, but is that an isusue in a car?
Thanks!

Posted by: jd74914 Jan 7 2020, 04:08 PM

The compensation is actually for the junction block at the back of the unit reading, so in this case you're compensating for cabin (or dash/center console) temperature if mounted there. Without compensation it'll assume something like 68*F temperature, so you could theoretically see errors of +/-30*F depending on cabin temperature. I think it's worth it as that's quite considerable error on a 300*F measurement.

Posted by: jd74914 Jan 7 2020, 04:12 PM

If you don't care about looks there are a bunch of panel mount industrial display options which run on 12VDC and may be cheaper than the "aerospace" stuff. All you need is something that reads Type-K thermocouples.

Posted by: Charles Freeborn Jan 8 2020, 10:53 AM

Excellent. Yes, a 30º error could be fatal to the top end. Thanks!