Author Topic: Gearbox Oil Temp Sensor Location  (Read 531 times)

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NSharpley

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Gearbox Oil Temp Sensor Location
« on: September 08, 2021, 10:39:50 AM »
Hi All,

Im installing a gearbox oil temperature gauge in my Alfetta track car.

Interested to know the sensor locations people have used.

My first thought was the drain plug but on closer inspection it is very close to the rear discs and may give false readings.

I would prefer a spot further forward but dont fancy drilling a hole in my gearbox when I'm not intimately familiar with the inside of the casing.

Current Alfa:
1975 Alfetta GT 2.0 Race car

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

Colin Edwards

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Re: Gearbox Oil Temp Sensor Location
« Reply #1 on: September 08, 2021, 01:24:57 PM »
Between the drain plug and the case would be perfect.  Given the aluminium gearcase is such a great conductor, any heat radiated from the disks will soak through the gearbox pretty quickly.  Plus when the car is moving forward the airflow will keep most convected heat downstream of the gearbox.  We used the below widgets for years when karting.  Very robust.  It was common to remove the spark plug from a kart engine 10 - 15 times over a race weekend.  The below NTC sensor is available in a ranges of id's.

https://www.alfano.com.au/product/head-temperature-sensor-under-spark-plug-previous-models/
Present
2020 Giulietta Veloce
2018 Abarth 124 Spider
1987 75 3.0

Past
2015 Giulietta QV
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5