Quote:
Originally Posted by wazzz
CHT sensor was first introduced on 911 engines with EFI (Motronic) because oil temp was not a good indicator for fuel/air mixture during warmup.
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I still use the chaincase sensor; I just datalog it as "oil temp", because it most closely resembles what the temp gauge in the car is reading.
Several have mentioned elsewhere that they have good results with a temp sensor in the breather cover for the EFI warmup cycle. Kind of wish I'd seen that before I went with the relatively expensive/sometimes hard to source Bosch CHT sensor (installed via the TK kit as i didn't want to remove a head and get it machined).
There isn't (or doesn't seem to be) a huge selection of short-reach Bosch temperature sensors, other than the VW/914 single-wire and the 911 one.
However, Ducati use, on their air-cooled EFI motors, a short reach temp sensor in the rocker cover (common to many Euro cars, dirt cheap and readily available as Beru ST088; should ideally use the Magneti Marrelli NTC calibration table rather than the Bosch one - but pretty close for this purpose).
With the benefit of 20/20 hindsight, I would probably do that, if I did it over...