Re: 190 degree water temp in 1935 Packard Eight

Posted by Owen_Dyneto On 2015/3/9 11:11:45

If your gauge is accurate, you won't do any harm and in fact might have better combustion, etc. But I'd use a quality thermometer (or a heat measuring gun if you're into more modern technology) in the top radiator tank and verify the gauge is accurate. IMO the only issue with running at 190 deg. F is, as a non-pressurized system, you don't have a lot of margin to the boiling point. Are you shutters fully open at just above 160 deg. F.?

That said, assuming your Pines shutter-stat is functioning properly (they are 160 degree units) and unless the car is under stress or has some minor overheating issues, the running temperature should be much closer to 160 deg. F. except perhaps on a hard uphill pull or stop-and-go traffic on a hot day.

Just for comparison to my 34 Eight which has essentially the same engine and cooling system, on normal cruising at 40-45 mph of summer days (80-85 deg) my temperature will be just at the set point of the shutter stat, about 160 deg. On a long, hard uphill climb of a mile or more it can rise to 180 or so but when coasting the far side it will almost immediately drop back to 160, sometimes even less. If I push it (which I don't willing do) to 50-55 mph or so it will run hotter, about 170.