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Old 02-14-2006, 07:47 PM
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Best place to put the temp sensor

I'm installing after market gages in my car. Its a SBC and I was thinking about two gages one for water temp and one for oil temp.
Right now I have the water temp gage in the intake by the water inlet.
Would it be better to install it by the head?
Where would be a good place for oil temp?
Thanks for the help
Jake

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Old 02-14-2006, 09:02 PM
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Putting it by the water neck is easy and provides pretty good results. It will show a more accurate reading as far as the thermostat is concerned. If you have a 195 stat, it will read 195 when it is fully open. If you put it in the head, it will probably read a bit higher but in my opinion is a better choice since it more accurately depicts what the combustion chamber is seeing and that is the more critical parameter. If you put it in the head, don't be alarmed if your gauge reads 210-220 with a 195 stat. It will be a little hotter in the head. Don't worry until that gauge says 235 or more
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Old 02-14-2006, 09:34 PM
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putting it in teh radiator side of the thermostat housing can lead to problems

the first one is that you get a fluctuating reading , while the thermostat is closed, the water in the hose will slowly cool off, and the reading you see will drop, and then will suddenly spike when the thermostat opens

and if your thermostat ever sticks closed and the car starts to overheat, you'll never know, until steam starts to roll out from under the hood

with the sensor in the intakes coolant passage, its constantly exposed to whats going on in your engine, and you wont have to watch your gauge constantly waving hello to you
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Old 02-14-2006, 10:39 PM
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I like putting it in the cylinder head. Its the most expensive part of the engine (especially if you are running aftermarket heads) and the part most likely to be damanged in an overheating situation. As such, I like to know what temperature THAT part is seeing.
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Old 02-15-2006, 04:16 AM
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Quote:
Originally Posted by lowROLLERchevy
putting it in teh radiator side of the thermostat housing can lead to problems
How can you do that? Putting it on the radiator side of the thermostat means putting it in the upper hose. We're talking about putting it in the manifold water passage or the head... both of which are before the thermostat.
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Old 02-15-2006, 04:18 AM
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Thanks!
Its in the intake manifold not the water neck. I was just wondering if there was a better place to put it and where I should hook up one for oil temp.
I have an aftermarket one and I am going to hook up the stock sensor as well. I want to be able to see both.
One for water temp + idiot light and one for oil temp.

Where are you installing the sensor in the head?
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Old 02-15-2006, 04:49 AM
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The oil temp sensors that I have seen replace the oil pan plug. If the motor is out, get a bung welded into the side of the pan.
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Old 02-15-2006, 06:14 AM
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A better place for the oil temp sensor is in a T where the oil pressure gauge connects. I'm not sure it's big enough for a sensor though -- I've never connected an oil temp gauge. You should really use a cross (four way) here as you should have a T already. Even running a gauge you should have the idiot light connected. I've seen a gauge fail before, idiot lights rarely fail. It's a good backup anyway.

If you have an external cooler put a T in the feed line as it comes out of the block, as close to the block as practical. Make sure it's the feed and not return line.
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Old 02-15-2006, 11:33 AM
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What about the plug right above where the oil filter is located?
I have a remote oil filter but I dont want to install any more fittings in the line. If nothing else I will leave it where its at and hook the stock one up as well.
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Old 02-15-2006, 12:12 PM
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[QUOTE=farna]A better place for the oil temp sensor is in a T where the oil pressure gauge connects. I'm not sure it's big enough for a sensor though --

I've never connected an oil temp gauge.

QUOTE]


Why would you measure the oil INLET temperature at the pressure port????
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Old 02-15-2006, 12:49 PM
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Quote:
Originally Posted by curtis73
How can you do that? Putting it on the radiator side of the thermostat means putting it in the upper hose.
woops, shows how tired i was when i responded to your post

i thought you said "in the water neck" ..... which ive seen people do .... and then wonder why they dont get a constant reading ...
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