[chrismorse]

How “fine” is the temp controll on the stock, or mocal thermostat. Aren’t. Both water and oil thermostats controlled by a melting wax pellet?? My water cooled stuff goes from cold to a rock steady “normal” very quickly and stays there consistently, even in traffic or when driven hard.
It seems that the 911 thermostat does the same, except that it would appear that it reaches max thermal capacity fairly quickly, then the temp starts to rise, as in sitting in traffic, or hammering it in the hills and watching the needle rise.

This begs the question, why not put in a bigger cooler, or another one as well???

Given the eye watering cost of pulled head studs and worn guides, I submit that this would be cheap insurance?? When was the last time you overheated a water cooled car?

Interested,
Chris

Ps, as a side note, I have a 308 that has a ducted oil cooler, but no thermostat - it would take forever to get the oil up to temp for spirited driving. When the stock cooler sprang a leak, I sourced a mocal cooler, thermostat and -12 aeroquip lines, bingo, car warms up much quicker.