Quote:
Originally Posted by Porchdog
Are you running a thermostat and a pressure cap? Do you know the thermostat setting and the pressure cap setting? Do you have a temperature gage?
You can run with just water, for a while. Long term, you won't have the lubricity for your water pump seals, you will tend to have more corrosion and you will be more prone to overheating.
If you have a pressure cap I can supply a boiling temp for pure water at that pressure. Then, if you have a temperature gage, you will know your "safe" temperature.
I don't know of a good substitute for antifreeze.
If I were you, I'd run it for a week or so on straight water, watching for overhheating or leaks. If it doesn't leak in a week you should be OK.
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My cap is 13PSI and brand new and my thermostat is 180* and also brand new. I don't have a temp gauge but the engine doesn't "overheat" so if my boiling point is above 200-215* I won't run anything but water at first.