Posted by Alan Bowes on January 29, 1998 at 15:19:31:
In Reply to: M37 Heat - Water Temp posted by Larry Kutz on January 29, 1998 at 14:20:28:
Here are a couple of thoughts:
What is the ambient temperature where you are using your M37? It can make a big difference, since engines are cooled not only by the coolant circulating through the radiator, but also by cold air rushing over the engine, cold air entering the intake manifold, and by the heater, which in some cases is capable of keeping the engine cool without any help from the radiator whatsoever.
For example, if it's say, 20 degrees below zero F. outside and you aren't heavily loading the engine, it is VERY possible that the combination of the heater and the cold air is more than capable of cooling the engine and it may never reach full operating temperature, even with a good thermostat. The 230-inch six is not a high-output engine and it has a lot of external surface (read "cooling") area per horsepower. In addition, the fender-mount hot-water heater is no slouch, either.
The original fender-mount heater kits came with a canvas "winter front" for the grille to keep the temperature higher inside the engine compartment. So your approach in putting a cover over the radiator is spot on and is considered normal procedure in cold climates.
As to proper thermostat temperature, I'd have to check my manuals when I get home tonight, but you should have, as an absolute minimum, a 160-degree thermostat. I prefer a 180- or 190-degree F. thermostat for most applications. Many newer cars have thermostats rated over 200 degrees F.
Alan