Ok, so with a less than ideal start to data logging today (engine temp quite warm to start) temperature dropped until it reached equilibrium at 25.2F above ambient. 41F engine temp at 15.8F ambient temp. Considering how far away the heat source is from the coolant sensor I'm using to measure I think that's a pretty decent result.
I'd like to do a few cold soak tests next. First one with oil pan heater only, then with block heater only, then with oil pan heater and block heater together.
Since I only have one morning a week to do these tests, it will take me 3 weeks to complete. Ha! Delayed gratification.
