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E-glycol and P-glycol based "coolants" may not be as efficient as plain water at transferring heat at normal operating temps, but BEWARE! Once water approaches its boiling point and steam emminates from the hot spots of the heads, effectively shielding those surfaces from the water, very rapid loss of ability to soak heat from the hot spots will allow over-heated areas to become larger and extremely hot in very short order.

The pressure of our systems does add a bit to the boiling point of water, but a GL1800 in parade mode would, in my opinion, easily overcome even that enhanced heat tolerance of water alone. The glycol coolants not only lower the freezing temp of the mix, they also extend the boiling point upward. Some coolants are available that eliminate the water alltogether, thus providing a very high heat tolerace (resistance to steam or boiling). The bike's temp will be a little higher if the system is stressed beyond the range provided by just water, but the harmful head warping temps are then very unlikely to be approached. Plus, up in that range beyond water's toleracnes, the higher contrast between the glycol based coolants and the outside ambient temperature will more than overcome any advantage in heat transfer efficiency that water had over the coolant at lower temps.


Thanks for referring to it as "coolant", which is the correct nomenclature, and not antifreeze. :eek:4: What do the ones that call it the latter refer to it in the Summer? Antiboil? :lol::lol:

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