 Head, tempurature that is. |
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| underthetire |
 Apr 30 2009, 01:18 PM
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#1
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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  |
Does anyone know if a VDO CHT gauge will work with the stock head temp sensor, lets say 74 on?
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| type47 |
Apr 30 2009, 01:24 PM
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#2
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
No. The VDO CHT uses a thermocouple which generates a low voltage to power the gauge whereas the Cylinder head temperature sensor is a variable resistor that changes resistance value with temperature. So, no, one generates V and the other changes R, different things.
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| underthetire |
Apr 30 2009, 01:39 PM
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#3
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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 |
QUOTE(type47 @ Apr 30 2009, 12:24 PM)  No. The VDO CHT uses a thermocouple which generates a low voltage to power the gauge whereas the Cylinder head temperature sensor is a variable resistor that changes resistance value with temperature. So, no, one generates V and the other changes R, different things. Believe it or not, I understand. Installing a mass of thermocouples at work right now. Thank you. |
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| HAM Inc |
May 1 2009, 09:03 AM
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#4
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
It is also important to read CHT's with a probe under the spark plug.
BTW VDO cht guages are not accurate. Try a Dakota Digital. |
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| type47 |
May 1 2009, 10:55 AM
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#5
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
QUOTE(HAM Inc @ May 1 2009, 08:03 AM) BTW VDO cht guages are not accurate. I am so glad to hear this as my VDO CHT gauge reads 475 degrees F under hard use! |
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| mudfoot76 |
May 1 2009, 11:09 AM
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#6
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Currently teenerless :-( Group: Members Posts: 946 Joined: 18-March 04 From: Carmel, IN Member No.: 1,814 Region Association: None |
QUOTE(type47 @ May 1 2009, 12:55 PM) I am so glad to hear this as my VDO CHT gauge reads 475 degrees F under hard use! If you haven't read it yet, our wonderful FAQ section has a great article on cylinder head temperature. http://www.914world.com/specs/JakeRabyHeadTemps.php |
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| HAM Inc |
May 1 2009, 11:13 AM
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#7
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
!
QUOTE I am so glad to hear this as my VDO CHT gauge reads 475 degrees According to my customers, including the racing engineer Kevin Groot, VDO guages read high, but I'm not sure they were 125*high! You better get a real guage and make sure you're not cooking your engine. |
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| underthetire |
May 1 2009, 01:28 PM
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#8
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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 |
on the same subject, anyone know what type of thermocouple VDO uses? K, N, etc.
My meter has a K thermocouple input, also have an Omega thermocouple calibrator. |
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| jimtab |
May 2 2009, 01:41 AM
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#9
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Advanced Member Group: Members Posts: 3,477 Joined: 5-January 03 From: Pacifica, California Member No.: 91 Region Association: Northern California |
Quit doing that with the titles....I'm an old man and I think I have whiplash now.....shit.
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