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Old 09-09-2008, 12:29 PM
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Temp sending unit

What place is better for the temp gauge sending unit? in the head, or in the intake, by the thermostat housing? I'm referring to SBC and BBC here.

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Old 09-09-2008, 12:44 PM
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Quote:
Originally Posted by busterwivell
What place is better for the temp gauge sending unit? in the head, or in the intake, by the thermostat housing? I'm referring to SBC and BBC here.
In my opinion, to get the most accurate coolant temperature reading the sending unit (electric or mechanical) should be installed in the intake manifold near the thermostat housing.

NOTE:

Installing the sending unit in the head (passenger or drivers side) will yield a temperature reading roughly 20 degrees higher than the coolant temp because of the close proximity to the exhaust valve.

This location, in the cylinder head, was used by the manufacturer in later (80's and newer and even earlier for vehicles sold first in California) model smog equipped engines. These engines also used higher temp thermostats (195 degree), ported vacuum advance, and reduced timing. All this was done by the manufacturer to increase temps at idle to reduce the hydrocarbons and pass Federal (and some state) guidelines for emissions. They also reduced performance levels because of these changes.
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Old 09-09-2008, 01:46 PM
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temperter sending unit local

Do you want to know the temperature some where in the engine or the hotest point in the engine. I mean water boils at 212 degrees at atmospheric pressure regardless of where its at. A higher pressure rad. cap will let you run a higher temp without boiling over it thats what you want. Personally I want to know how high its getting anywhere. The head is where I build the fire. Closer to the flame, the higher the heat.
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Old 09-09-2008, 04:53 PM
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And that's what lead to my question. My 402 in my 71 1 ton always rans 200 to 210 with the AC running. I noticed the sending unit is in the head. I noticed a plug by the thermostat housing, where I could move it, and I thought that would be a good place and maybe show actual temps down to what I thought would be more reasonable numbers. That said, my wife's 01 Tahoe reads 205 all day long, after it warms up.
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Old 09-15-2008, 09:44 PM
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1st I think you should document the accuracy of the gage.

@ $30 for a complete set up why not buy 2 & install then in both places?

See what you like & how different they are.

You can always plug up the one you don't want.

My 71 LeMans always ran 220* +.

Anti freeze Is anti boil It works on both ends of the spectrum.




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Old 09-16-2008, 08:26 PM
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For accurate coolant temperature, using one of the two ports in the thermostat housing is the best place to go. Now if you are interested in finding out if your motor is getting too hot, then get an oil temperature sending unit and guage. If you do a search, you will find a lot of good information from some older threads that started with the same question you asked.

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