Believe the specific heat capacity of water is higher than antifreeze. Would have to dig out one of the old manuals I had in college to be sure. If that is the case, water would carry transfer more heat than antifreeze. If you are having cooling problems, however there are other things that need to be addressed first, as suggested by other posters. And yes, you need antifreeze in order to reduce/prevent corrosion. I would start with a good flushing of the cooling system, maybe several flushes with radiator cleaners and water flushes. If parts of the coolant system can be accessed easily, disassemble and flush however you can.
Can you power wash the engine outsides? A layer of grease and dirt on an old engine (and what old one isn"t covered?) can trap a lot of heat. Is there plenty of air flow off the fan over exterior of the engine?
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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