temp gauge accuracy
Posted: Sun Apr 22, 2012 1:21 pm
I have been plagued with a hot running engine since the completion of my +2 restoration years ago. A larger capacity electric fan did help a bit but I was unhappy with the 90 deg. C (and up) operating temperature.
I purchased temperature recording strips. They will record the highest temperature of a surface by changing color and are single use.
I placed the strip on the top tank of the alloy radiator just above the weld joint and adjacent to the radiator fan sender. What I discovered is that the radiator temperature never exceeded 200 F. The gauge (in deg C) reads between 10 and 12 degrees higher than actual temperature. So when the gauge reads 90 C it is actually around 80. This is where the temperature usually stays. The fan turned on around 190 F.
I wonder if the instrument voltage stabilizer is not functioning properly or do I need to add a resistor in line with the temperature sender to calibrate the gauge. I can just run it the way it is and consider 90 C a normal operating temperature.
Some more servicing a wash and wax and the +2 will be ready for a long trip.
Bob
1969 Elan +2
1968 TVR Vixen
1963 Jaguar MK2
coming 1960 Lancia Flaminia Berlina
I purchased temperature recording strips. They will record the highest temperature of a surface by changing color and are single use.
I placed the strip on the top tank of the alloy radiator just above the weld joint and adjacent to the radiator fan sender. What I discovered is that the radiator temperature never exceeded 200 F. The gauge (in deg C) reads between 10 and 12 degrees higher than actual temperature. So when the gauge reads 90 C it is actually around 80. This is where the temperature usually stays. The fan turned on around 190 F.
I wonder if the instrument voltage stabilizer is not functioning properly or do I need to add a resistor in line with the temperature sender to calibrate the gauge. I can just run it the way it is and consider 90 C a normal operating temperature.
Some more servicing a wash and wax and the +2 will be ready for a long trip.
Bob
1969 Elan +2
1968 TVR Vixen
1963 Jaguar MK2
coming 1960 Lancia Flaminia Berlina