Best coolant for our 60-70's Mopars?
better...
http://www.lubricationspecialist.com/evans-coolant/evans-npg-c-waterless-coolant/
interesting that is says motors run at higher temps (a property of waterless EG) operate more efficiently and MAY provide more horsepower. The properties of a 100% EG coolant (which are most likely not what Evans markets) need to e boosted with an antifreeze as EG freezes at 10F, but mixed with water sends that down to -49F.
"Pure ethylene glycol has a specific heat capacity about one half that of water. So, while providing freeze protection and an increased boiling point, ethylene glycol lowers the specific heat capacity of water mixtures relative to pure water. A 50/50 mix by mass has a specific heat capacity of about 3140 J/kg C (0.75 BTU/lb F) three quarters that of pure water, thus requiring increased flow rates in same system comparisons with water. Additionally, the increase in boiling point over pure water inhibits nucleate boiling on heat transfer surfaces thus reducing heat transfer efficiency in some cases, such as gasoline engine cylinder walls. Therefore, pure ethylene glycol should not be used as an engine coolant in most cases."
Mopar used to state Distilled water with Mopar anti-corrosion addative, best for heat transfer but offers no antifreeze/boil protection (but would never boil over under normal use). Interesting stuff.
