 multiple CHT installed, to one gauge |
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| malcolm2 |
 Jan 5 2012, 10:49 PM
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Advanced Member  Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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I wonder if anyone has ever tried to connect 1 gauge, CHT that is, to 2 cylinders. I can envision the leads coming from the spark-plugs connected to a toggle switch or some type of selector switch and then on to the gauge. Switch to the right, and I get the temp of the right side, switch to the left and I get the left side temp. Could it work? Did I read somewhere that the length of the wire has something to do with the accuracy?
I know there are gauges out there that will show temps on all 4 cylinders, but I do not want to invest that much. Just looking at the VDO CHT gauge. Any thoughts, Clark |
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Replies(1 - 6)
| FourBlades |
Jan 5 2012, 10:59 PM
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#2
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From Wreck to Rockin Group: Members Posts: 2,055 Joined: 3-December 07 From: Brevard, FL Member No.: 8,414 Region Association: South East States
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Thermocouple leads are sensitive to connections. If you put a switch between the thermocouple sensor and the gauge I think your reading could be way off.
There may be a way to do it using connectors made for extending thermocouple leads but I don't know how it would work. John |
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| aircooledtechguy |
Jan 5 2012, 11:04 PM
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
Westach makes a kit that can use 4 CHT sensors to hook to one gauge. It hooks all the sensors to a 4 position switch and then goes up to a common gauge. Pretty slick and you don't get any more accurate than a Westach set-up.
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| Rleog |
Jan 6 2012, 09:30 AM
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#4
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Senior Member Group: Members Posts: 608 Joined: 12-October 03 From: Middleton, MA Member No.: 1,239 Region Association: North East States
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| jaxdream |
Jan 6 2012, 09:42 AM
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#5
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Senior Member Group: Members Posts: 974 Joined: 8-July 08 From: North Central Tennessee Member No.: 9,270 Region Association: South East States |
QUOTE(malcolm2 @ Jan 5 2012, 08:49 PM)  I wonder if anyone has ever tried to connect 1 gauge, CHT that is, to 2 cylinders. I can envision the leads coming from the spark-plugs connected to a toggle switch or some type of selector switch and then on to the gauge. Switch to the right, and I get the temp of the right side, switch to the left and I get the left side temp. Could it work? Did I read somewhere that the length of the wire has something to do with the accuracy? I know there are gauges out there that will show temps on all 4 cylinders, but I do not want to invest that much. Just looking at the VDO CHT gauge. Any thoughts, Clark Clark you can get the switchable setup , just got to spend the money . You could also get the VDO setup X2 run both gauges and have a left bank / right bank gauge set , but still 2 gauges to look at , it would be the cheaper option to get both bank readings. Your call & $$$ dude. Jack |
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| 76-914 |
Jan 6 2012, 09:59 AM
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#6
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,509 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Here you go, take your pick
http://www.aircraftspruce.com/menus/in/chtgauges.html Westach is good enough for our cars but it was an entry level gage when I was flying. Our CHT thermocouples only produce about 2Mv so any changes to the original loom will result in some crazy readings. Remove resistance (trimming wires) and the indicated temp will be higher than actual temp. Add in resistance (splitting, soldering additional length's) and the indicated temp will be lower (if it even registers). |
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| underthetire |
Jan 6 2012, 10:21 AM
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#7
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
I agree, the thermocouple wire would be more expensive than an additional gauge. Thermocouples generate a small (millivolt) signal from heat, the gauge amplifies that to a decent signal and gives your reading. Any time you have a "cold joint" in a thermocouple system, you loose some of the millivolt signal. A switch not made for thermocouple would basically render the signal useless.
Its covered here http://www.omega.com/temperature/Z/pdf/z004.pdf Omega is generally considered the leaders in temp/force applications. |
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