> The TR3s and early TR4s had Fahrenheit temp gauges with a mid point of
> 185 degrees... which I think is pretty much normal operating temp for
> their engines.
>
> The later TR4s went with a Celsius gauge with a mid-point of 70 degrees C
> which is 158 degrees F. Did they expect that engine to now operate at 158
> degrees?
>
> What has me thinking is that using the 'F to C' conversion formula yields:
> (185-32)(5/9)=85C but if you get the operations out of order it can
> incorrectly yield: 185(5/9)-32=70.8C.
>
> Do you suppose they just goofed on the conversion and ordered gauges with
> 70C as the mid-point? Or was there some other reason for this?
Geo,
There was a discussion about this on the list a couple of years ago. At
that time I stuck a candy thermometer in my open radiator and read the
temperatures as the car heated up and compared them to the gauge readings.
Not the most accurate experiment I admit... however, based on my readings,
the 70C on my Celsius gauge corresponds to about 185F.
I think they goofed.
Kurtis Jones
Russellville, Arkansas
1963 TR4 - CT19389L
1959 AH Bugeye - AN5L23250
www.geocities.com/tr4_1963
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