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> Cylinder head temperature gauge
Geezer914
post Jan 13 2021, 03:53 PM
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VDO no longer makes them, any other gauges out there?
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BeatNavy
post Jan 13 2021, 04:20 PM
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Oh yeah. At least a few of us use this one:

https://www.dakotadigital.com/index.cfm/pag...prod/prd347.htm
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barefoot
post Jan 13 2021, 05:01 PM
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Here's mine
https://www.ebay.com/itm/Digital-DC-Tempera...it/172101324800

And matching TC's
https://www.ebay.com/itm/J-Type-Thermocoupl...HT/172302303136

Cold junction compensated and works quite well (IMG:style_emoticons/default/smile.gif)
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Olympic 914
post Jan 13 2021, 05:26 PM
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QUOTE(BeatNavy @ Jan 13 2021, 05:20 PM) *

Oh yeah. At least a few of us use this one:

https://www.dakotadigital.com/index.cfm/pag...prod/prd347.htm


(IMG:style_emoticons/default/agree.gif)

They also have a nice matching digital oil temp gauge.


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930cabman
post Jan 13 2021, 05:56 PM
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I just ordered a new set of VDO gauges, oil temp, oil pressure, clock and voltmeter from Summit and also found out they are no longer making a cyl head temp gauge. Nuts. I was hoping to fill the console with a 5 gauge cluster. Off to plan B
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jeffdon
post Jan 13 2021, 07:01 PM
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I got mine from https://www.aircraftspruce.com/

They have one that looks super close to VDO gauges, plus they are temperature compensated. VDO are not,
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Mark Henry
post Jan 13 2021, 09:36 PM
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I have a micro1000 from Aircraft Spruce, the small round CHT is real close fit with the aftermarket VDO cockpit gauges.
Con is the numbers are a bit small... but if the needle stays straight up (300F) I'm golden.
Pretty sure it's the same one as Jeff's.
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Charles Freeborn
post Jan 14 2021, 01:03 AM
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http://thesensorconnection.com/category/ch...all-cht-sensors
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Geezer914
post Jan 14 2021, 08:35 AM
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Thanks for the replies, went with a Dakota Digital.
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mate914
post Jan 14 2021, 09:32 AM
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If I may ask? Which spark plug do you install CHT probe on? I would like to know for both the six and four cylinders.
Thank you.
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Mark Henry
post Jan 14 2021, 09:57 AM
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QUOTE(mate914 @ Jan 14 2021, 10:32 AM) *

If I may ask? Which spark plug do you install CHT probe on? I would like to know for both the six and four cylinders.
Thank you.


/4 the #3 cylinder runs the hottest.

/6 it doesn't matter as much, some say #1, some say #6....I used #1 just because it's the easiest to run to.

Edit: For the /6 the #1 cylinder is the easiest for me to get to as I'm twin plug and I have a lift. I have my sensor on the lower #1 plug hole.
On a standard 6 plug engine the 4/5/6 side may be easier to get to.
This is important because you must take care not to twist or cut wires on plug install. On my six I cut/notched the plug hole seal for the CHT sensor wires.
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veltror
post Jan 14 2021, 03:55 PM
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https://kaefertuer.com/produkt/zylinderkopf...ge-1-1-12-volt/
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930cabman
post Jan 14 2021, 04:12 PM
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QUOTE(veltror @ Jan 14 2021, 04:55 PM) *


Just read your rustoration thread, heroic to say the least. Keep the faith and hopefully soon your 914 will be rolling down the road.
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pete000
post Jan 14 2021, 06:23 PM
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I have a NOS MIB VDO CHT stashed away...
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FlacaProductions
post Jan 14 2021, 06:30 PM
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LOL - NOS MIB VDO CHT.

Very cool but not temperature compensated, is it?
Maybe not a big deal but nice not to have to do math in public.
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930cabman
post Jan 14 2021, 07:15 PM
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Can someone educate me with regards to "temperature compensated"
thank you
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davesprinkle
post Jan 14 2021, 08:10 PM
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QUOTE(930cabman @ Jan 14 2021, 05:15 PM) *

Can someone educate me with regards to "temperature compensated"
thank you

There are various types of temperature sensors. The kind called a "thermocouple" uses a very specific alloy of wire. Accurately measuring temperature with one of these sensors requires that the measurement circuit know the temperature at the point that this alloy is connected to copper. (This is misleadingly called the "cold-junction" temperature.) Cheap devices omit this cold-junction temp measurement and are less accurate as a result.
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FlacaProductions
post Jan 14 2021, 09:07 PM
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as i understand it - and i could be wrong - non-temperature compensated gauges will read out higher as the ambient temperature goes up and lower as it goes down. ie: if your engine temp is (for example) 250 at 72 degrees, a non-compensated display will show 260 at 82.

temp-compensated will show 250 no matter the ambient temp.
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Highland
post Jan 14 2021, 10:15 PM
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I think Ratwell has a pretty good explanation:

https://www.ratwell.com/technical/VDOGauges.html#cht

It almost seems VDO assumed if your head temps got high the engine compartment temperatures would also be high so they compensated with the scale.

I have a VDO gauge and still trying to figure out how to interpret the information based on the outside air temperature that day. Any recommendations would be appreciated.
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aharder
post Jan 14 2021, 10:29 PM
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I had a VDO for years and then it failed. I ended up with this one and I've been
pleased with it so far.
https://discountegauges.com/deg-cylinder-he...10-901-12-12ft/
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