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> CHT Gauge, Suggestions?
sdoolin
post Jun 6 2016, 12:24 PM
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I have searched - cannot find much on aftermarket CHT Gauges.

I am building a 2056 that will run dual Dells - would like to install a quality CHT gauge and wondering what others have used.
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JoeD
post Jun 6 2016, 12:37 PM
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Researched this when I was looking to put one in my car. Most folks weren't too happy with the VDO CHT and many recommended Aircraft Spruce. I bought the following and have installed all but the sensor as I am still waiting on engine; I've included part numbers and what I paid back in November:

aircraftspruce.com

10-01425 2" CHT PYROMETER GAUGE 61.75
10-00823 CHT PROBE 14MM M-1000 23.95
10-01443 15 CHT EXTENSION LEAD 51.25
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BeatNavy
post Jun 6 2016, 01:18 PM
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I'm running a Dakota Digital.

I think there are at least several others here as well. I think it has a good reputation, and I'm generally happy with it.
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era vulgaris
post Jun 6 2016, 01:25 PM
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I'm running the MGL Avionics Stratomaster Velocity TC2.

Digital, 4 channels, you can see the temp of every cylinder.

User manual:
http://www.stratomaster.eu/lignes/mgl/pdf/Vel_EN_TC2.pdf

Might seem excessive to some, but it's been a massive aid in tuning and knowing that each cylinder is right on target. I also had an unexpected vac leak issue a couple months back, and looking at the gauge I knew immediately which cylinder had the problem.

Here it is in my center console...


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Mueller
post Jun 6 2016, 01:28 PM
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QUOTE(era vulgaris @ Jun 6 2016, 12:25 PM) *

I'm running the MGL Avionics Stratomaster Velocity TC2.

Digital, 4 channels, you can see the temp of every cylinder.

User manual:
http://www.stratomaster.eu/lignes/mgl/pdf/Vel_EN_TC2.pdf

Might seem excessive to some, but it's been a massive aid in tuning and knowing that each cylinder is right on target. I also had an unexpected vac leak issue a couple months back, and looking at the gauge I knew immediately which cylinder had the problem.



I like that one, I was just going to ask about it when I saw it on the spruce site!
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Downunderman
post Jun 6 2016, 02:11 PM
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http://www.speedhut.com/gauges/Temperature...id=f232|f10|f70
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Mueller
post Jun 6 2016, 02:41 PM
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For the true DIY guy...

https://learn.adafruit.com/thermocouple/
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sdoolin
post Jun 6 2016, 05:52 PM
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Thanks for the info - I knew y'all would be able to help. Naturally, I have follow up questions...

First - can I assume these CHT gauges utilize the OE sensor in the head (I have brand new HAM heads drilled/tapped for OE sensor at cyl. #3) and also assume they connect to the OE wiring (single lead from sensor)?

Second - era vulgaris what's the story behind that poster in your garage with the police car and the daisy dukes? I think I need one of those.

Thanks as always...
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BeatNavy
post Jun 6 2016, 06:20 PM
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QUOTE(sdoolin @ Jun 6 2016, 07:52 PM) *

First - can I assume these CHT gauges utilize the OE sensor in the head

I don't think so. The Dakota Digital uses a thermocouple with a sensor (14mm?) that goes under the spark plug. No use of the OE sensor. I think others may be similar in some or most cases.
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76-914
post Jun 6 2016, 06:32 PM
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QUOTE(BeatNavy @ Jun 6 2016, 12:18 PM) *

I'm running a Dakota Digital.

I think there are at least several others here as well. I think it has a good reputation, and I'm generally happy with it.

Good stuff. FWIW, I found the VDO to be "somewhat" accurate if coupled to the Dakota sender. Does Dakota still offer the 12' lead, only?
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BeatNavy
post Jun 6 2016, 06:50 PM
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QUOTE(76-914 @ Jun 6 2016, 08:32 PM) *

QUOTE(BeatNavy @ Jun 6 2016, 12:18 PM) *

I'm running a Dakota Digital.

I think there are at least several others here as well. I think it has a good reputation, and I'm generally happy with it.

Good stuff. FWIW, I found the VDO to be "somewhat" accurate if coupled to the Dakota sender. Does Dakota still offer the 12' lead, only?

No, in the 14mm spark plug size they only offer 18' lead, I believe. That fits the stock 914 plug, otherwise you're trying to make the other one fit, which is not ideal.
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Porschef
post Jun 6 2016, 07:26 PM
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Like Rob, I've been running a Dakota unit for about 3 years. It's accurate, but I've found that under load the numbers jump around some but then settle back. I've checked grounds, but I'm thinking my alternator might be a bit weak, I'm getting 12.6-12.8 when running.

I think that's a bit low... (IMG:style_emoticons/default/idea.gif)
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ThinAir
post Jun 6 2016, 10:59 PM
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QUOTE(Downunderman @ Jun 6 2016, 01:11 PM) *

http://www.speedhut.com/gauges/Temperature...id=f232|f10|f70

I really like the look of this. It looks like it would work well in the stock center console holes. Does anyone have any experience with how accurate it is?
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Jake Raby
post Jun 7 2016, 06:52 AM
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Never, under any circumstance should the stock CHT sensor boss be used with a CHT gauge.

I have proven over and over again that this position takes too long to see thermal changes, and is 50F lower in temperature, all the time, than the under spark plug location.

The stock CHT location was chosen for the EFI system for many reasons that won't apply to CHT gauge. Primarily, the fact that the location was chosen because it takes longer to warm up, and also longer to cool down than other locations in the head casting.

For a CHT gauge, the ONLY place that the sensor can be located, for any level of response time, and accuracy, is under the spark plug.
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sdoolin
post Jun 7 2016, 07:00 AM
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Under the spark plug it is then. I assume these gauges come with the appropriate sensor(s) and wiring - I'll follow the links provided and do some more learning.

Thanks to all as always...
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Mueller
post Jun 7 2016, 07:16 AM
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Jake, any special prep to the surface where the sensor meets the head?
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jeffdon
post Jun 7 2016, 09:16 AM
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QUOTE(JoeD @ Jun 6 2016, 11:37 AM) *

Researched this when I was looking to put one in my car. Most folks weren't too happy with the VDO CHT and many recommended Aircraft Spruce. I bought the following and have installed all but the sensor as I am still waiting on engine; I've included part numbers and what I paid back in November:

aircraftspruce.com

10-01425 2" CHT PYROMETER GAUGE 61.75
10-00823 CHT PROBE 14MM M-1000 23.95
10-01443 15 CHT EXTENSION LEAD 51.25


That is what I went with. The CHT gauge is also temp compensated, the VDO is not.
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wes
post Jun 8 2016, 12:57 PM
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I have been reading this and was planning to put a VDO head temperature gauge in my consul as I'm installing a triple cluster gauge in the dash. Now hearing so much about the VDO head temperature gauge being so inaccurate looked into it more and have heard that if you use the sensor from the 911 it would turn better results.
Any thoughts or experience and I might add my engine is now a 2056 and will probably be doing a very minor bit of track time though nothing serious?
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tradisrad
post Jun 8 2016, 01:31 PM
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I'm happy with my VDO gauge and sender. I'm not looking for 100% accurate numbers, but more over I'm looking for drastic changes while driving and for that I think the VDO is just fine. Plus the VDO matches the other gauges in my console (except for the wide-band o2 GAUGE)
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Mblizzard
post Aug 27 2016, 08:47 PM
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I just added the Dakota Digtial. I was wondering what would be normal ranges?

Running around see 350 to 375. Running hard it can hit 400. Comes down quickly on normal driving but I was wondering where the sweet spot should be and where the danger zone is?

Also it seems to respond quickly increasing with throttle. Was a bit surprised by the quick changes in temp.
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