cylinder head temp gauge

[gleep_54]

What is out there now that VDO seems to no longer be available? I'd like a set up where I can check all the cylinders on one read out.

thanks!
Pat

[gereonb]

I bought a 4-channel K-Type Digital Thermometer and then bought 4 K-Type thermocouples, they have the spark plug ring and are 10-12ft long.
Total cost was about $60 on amazon.

The meter is ugly as hell but I am thinking of taking out the internals and making it glove-box mountable or similar.

Meter:
https://www.amazon.com/gp/product/B01CNLX9M4/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

Thermocouples:
https://www.amazon.com/gp/product/B00V1XXU52/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

[gleep_54]

thanks! that helps alot!

Pat

[bpritchert87]

gereob,

Thank you also for the tip!

Did you happen to find a thermocouple that works for 12mm spark plugs?
I did a quick search but couldn't find anything.

Thanks again!
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[DerekC]

[gereonb]

Keep in mind also that some of the newer Third party cylinder heads and even OEM FI heads have a threaded socket on the head (usually only one per head) for screwing in a CHT sensor. There are a lot of cheaper K-Types that would screw right into that hole, it is far easier then using the Spark plug ones.

[W1K1]

aircraft spruce has westach cht gauges and does a 4 cyl kit.

http://www.aircraftspruce.ca/categories/avionics_instruments/av/menus/in/westach_cht.html
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far easier and far less accurate. That location was used by VW to determine if the engine "wasn't cold". Temp readings there move very slowly, and are not nearly as useful as beneath the plug.

[gleep_54]

geronb-

after installation, how accurate do you feel this setup was? I got them (ad to modify the plug boss to get the ring on there) , have the meter kinda strapped on so I can see it. Only installed on #3 since that ought to give me an idea of what's going on.

What were the readings you got going down the road?

thanks!

[mikedjames]

I recently siliconed a Chinese type-K sensor into that hole in the cylinder head on my T1. And although it is not 'instant' it has been enough to inform me of what was going on.

So far - normal driving including up hill 210-270F. And worst of all was when I switched off immediately after running hard at 70mph in a supermarket car park off a motorway junction was 300F through heat soak without any cooling.

The chip I am using does not like the fact the Chinese sensor is grounded to the bolt that screws into the hole in the head - just as well the silicone insulates it, and I was able to put insulating sleeving on the cable to the computer.

I homebrewed the computers and software so the choice is mine on how many sensors I fit...

This is displaying Celsius...
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[Clatter]

Thanks for illustrating what John said above;
The CHT censor located in the boss reads quite a bit lower for the same measured beneath the plug.

The fact that the head heat soaked when you shut off the motor,
And your sensor mounted a bit away, in a cooler part of the head,
Started reading a temp closer to what the plug area would see,

Those cast-in bosses are just to tell the computer "cold or not cold",
And won't provide good info as as to how hot your heads are running..

Maybe one day enough people will have sensors in both locations,
And we'll start getting solid info on how exactly what the difference is between the two..
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[Dogo]

Forgive the noob question, but... the washer style installs under the spark plug? The spark plug’s washer stays, or does the sensor take its place? There are no issues with the plug sealing properly or displacing the spark plug away from its ideal location (I don’t know how thick these washers are)?
Thanks in advance

[SRP1]

These work excellent-

Click on the round gauge once on the page, it's 2-1/4"
http://m.aircraftspruce.com/catalog/inpages/westcht1.php

12mm ring J type thermocouple
http://m.aircraftspruce.com/catalog/inpages/integra6724_0SH2.php?clickkey=81717

[saw2]

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

These are also from Air Craft Spruce and work excellent also. The Micro 1000 cht gauge is temperature compensated which a lot of cht gauges are not. The benefit is the the Micro 1000 gauge reads the same no matter what the ambient air temperature is.

They also come in square or round face gauges.

[tattooed_pariah]

I installed this gauge in my car late last year. with 4 K-types (one under each plug) I have near instant readings on all four cylinders.

http://thesensorconnection.com/gauges-pyrometers/a...eter-gauge
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[Multi69s]

One thing I like to do is make sure that that the thermo coupler ring is held in a permanent position. I've seen a few engines where the sparkplug threads get buggered up when the ring gets cocked when the sparkplug is being installed, granted, this is a Type 4 head, but the same principle can be used on a Type 1. Yes that's JB Weld it can handle temps to 550 deg. I also made damn sure that there is none between the ring and the head.

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[Dogo]

[Multi69s]

removed
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73 Squareback - 2L, T4, Automatic W/ AC
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Gone but not forgotten 72 Baja Bug 2010
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[Wreck]

I'm also using a MGL TC-1 as well , also on a Type4 , I didn't want to remove any material from the plug boss so I JB Weld/devconed the thermocouple to the side of the plug boss.
The Thermocouples are pad type from omega . they are long enough to run under the back seat where I've a joiner to the cable from the gauge .

Try and get multi strand thermocouples as the single wire ones are prone to braking after a time due vibrations etc .

[harrywt]

This is in regard to keeping or removing the sparkplug seal. What is your reasoning regarding removing them?

cheers,
Harry