Lotus Elan

Possible oil temperature sensor location

PostPost by: madmaxsiegl » Wed Jun 03, 2020 12:40 pm

Hello,

I would like to fit an oil temp sensor and was wondering if I could use the port on the exhaust side, I marked in the picture. Or do I have to mount a sandwich adapter?

Thanks in advance for your input!

Cheers,

Max
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PostPost by: Foxie » Wed Jun 03, 2020 4:11 pm

A temperature sensor in this position will give you mainly the block temperature.

As the block is water cooled, it may not represent the actual oil temperature.

I brazed a threaded nipple to the sump.

When I went to dry sump, I fitted the temp sensor to the oil tank.

:)
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PostPost by: 1owner69Elan » Wed Jun 03, 2020 6:23 pm

There are also sump plugs that are drilled and threaded to accept an oil temperature sensor. No additional port needed. That's what I have.

Sensor connected to a gauge in the glove compartment as I didn't want to impact the stock look of my dash or interior by having it hang down underneath.
IMG_0452.jpeg and


It's a "smart" gauge that is connected to a warning light on my dash which is a hidden tri-color LED inside a dash bolt (Blue: cold / Green: warm / Red: Hot). With varying intensity. Green for normal running is at a low intensity level to not be annoying while driving.

IMG_8214.jpeg and


Only negative is that the location of the temp sender seems to be a bit vulnerable to be banged by being at a low point on the car. But, no problems so far.
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PostPost by: Quart Meg Miles » Wed Jun 03, 2020 8:57 pm

1owner69Elan wrote:There are also sump plugs that are drilled and threaded to accept an oil temperature sensor. No additional port needed.

I made one and fitted a contemporary capillary gauge through it. It worked fine for 35 years but when I moved it to a thread fitting brazed into the sump opposite the drain plug it read higher, even after I wrapped insulation around it as a shield from the exhausts. I assumed it was due to deeper penetration.

I agree with Foxie concerning your original proposal.
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PostPost by: Foxie » Wed Jun 03, 2020 10:45 pm

1owner69Elan wrote:There are also sump plugs that are drilled and threaded to accept an oil temperature sensor. No additional port needed. That's what I have.


Great idea, and a new one on me !

Very much in line with that great Chapman philosophy " Every component should have least three functions"

:)
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PostPost by: geni » Thu Jun 04, 2020 7:04 am

super and efficient, very interesting! would like to know the references and supplier (address) of this installation integrated into the dashboard screw
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PostPost by: 1owner69Elan » Thu Jun 04, 2020 6:50 pm

geni wrote:super and efficient, very interesting! would like to know the references and supplier (address) of this installation integrated into the dashboard screw


The "smart" oll temperature gauge is from Autometer:

https://www.autometer.com/2-1-16-oil-te ... elite.html
autometer.jpg and

Using standard features I programmed three ranges of oil temperature. Depending on oil temperature the gauge then sends signals to the tri-color LED in the dash through some logic circuitry, adapted from the included instructions, using relays to switch between the LED colors.

More info here in previous post:

viewtopic.php?f=38&t=39988&p=279711&hilit=+dash+screw#p279711
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