biosehnsucht wrote:As long as you've got a big / working radiator, there's no need for a cooler thermostat, it'll just make warmups more of a ***** and cold weather suckier.
I'm running a new, stock radiator, with a 160-165* thermo. My car has NEVER been over 180 degrees since I rebuilt the motor. But anytime the ambient temps get below 60*, the car never breaks 150*. This is actually a bad thing because below that temp, the fuel doesn't atomize very well, hence the need to richen the mixture when it's cold. I'm now switching up to a hotter thermo, not just because it's winter, but because I didn't really see any improvement in the running of the motor with a colder thermo.