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Old 08-18-2006, 09:45 PM
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water temp sender resistance curve

Hi,

Just put new heads on my 73 l48 350 corvette. did not notice till all assembled that the temp sender hole on the new heads is 1/2NPT - so the old ACDelco G1852 sender won't fit.

I need a new 1/2"NPT sender that will work with my stock 1973 water temp gauge. the old sender measures ~600 ohms at75 F.

any advice or recommendations most welcome.

Thanks,

jp

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Old 08-19-2006, 12:03 AM
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Doc here,

Two things to try, ..

One is take it the the parts house and try and match the resistance range to the thread size..

OR If the sender is smaller..Get a Brass reducing nipple that will fit flush on the bourden tube..(so the sender is still in the water stream)

You didn't say if the sender was smaller or larger..(this assumes smaller)

Are you sure about the measurement on the sender? 600, not 60?

Doc
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Old 08-19-2006, 07:01 AM
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water temp sender r curve

Doc,
Thanks for the reply.

Old sensor from stock 1973 cast iron heads is larger than the hole in my new AFR 180 heads.

The AFR 180's have a 1/2 NPT hole - so I need a sender to fit that that will work with my stock 1973 corvette water temp gauge.

I put the old sender in some hot water on the stove and recorded the following - 'Degrees F' / 'Ohms'

106/435
137/287
164/180
180/155
190/133
200/115
boil/104

so I am looking for a new sender with 1/2NPT that is close to this thermistor curve

Thanks again,
jp57
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Old 06-25-2007, 10:38 AM
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Coolant temperature sender

Hi, IMNOMAD

Did you ever get a part number for the sender? I am in the same situation and until I get a new sender I have no way of knowing the eng temp.

Let me know what you found out if you wouldn't mind.
Thanks
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Old 06-25-2007, 02:12 PM
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There is another way around your problem, given that your original sender (which is compatable with your guage) is larger in dia. than your new hole.

You could insert a steel (chrome) tube into the top rad hose with a weld in boss the correct TPI for your old sender, then plug up the hole in the Cyl head.

Just a thought.
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Old 06-25-2007, 04:33 PM
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Doc here,

IF you had no luck trying to "hand match" them at the parts store, what I would do, Is get some 1/2 NPT plugs, plug the holes off..Then get a Custom Gooseneck for the thermostat with a stock sender hole in it..

That would be the easy way to resolve the problem.

Another source is get a SS "T", Adapter..and a 3/4 SHORT NPT nipple, and a 3/4 NPT hose bib nipple.

Remove the heater hose from the manifold, then the Stock hose bib..install the nipple and "T adapter" here, then install the hose bib on the "T" and heater hose, Then install the sender in the "T" adapter, (1/2 NPT) .. BE sure the sender is in the media Though, or it won't read..(not too shallow).

Doc
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Old 06-26-2007, 12:58 PM
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Is there a threaded hole in your intake manifold near the thermostat housing? I have the stock sending unit connected to my original gauge, and I added a mechanical gauge with the sender mounted in my Edelbrock intake manifold.

Bruce
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Old 09-26-2012, 05:17 PM
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Quote:
Originally Posted by imnomad View Post
Hi, IMNOMAD

Did you ever get a part number for the sender? I am in the same situation and until I get a new sender I have no way of knowing the eng temp.

Let me know what you found out if you wouldn't mind.
Thanks
I need to know too. I have Dart heads on my "71 Vette - thanks
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