@Mag, I apologize, I must of looked over your post on heat transfer. I actually have the same material as you posted and tons of it as I researched and tested coolants well over a year prior to producing XF2. According to my documentation on coolant heat transfer, water-less coolants transfer 25% less heat than pure water, 16% less than a typical 50/50 water glycol mixture.
However, on paper and in field are two totally different measurements. Especially in this case. Not sure what the standard testing is or at what temperature they tested at which would make a big difference. As with any product I produce, I am also prompted to test in my laboratory. I used two heated vessels (graduated beakers), one with water and one with pure water-less coolant. I brought both up to the maximum temperature of 212F as recorded with both my glass thermometers and via laser. I inserted a heat exchanger into both and measured rate of temperature decay. I tested several times with several different water-less coolants, including my current experimental coolant. All of the coolants dropped their temperatures faster than the straight water. I will also like to note that the coolant came up to temperature much faster than the same amount of pure water. Obviously I couldn't recreate atmospheric pressure, but the evidence was well towards water-less coolant, even with my crude experiments.
The biggest difference in an engine with a water-less coolant is the lack of cavitation. Cavitation occurs not only at the pump, but nearly everywhere around the cylinder, hoses and head. It's those little bubbles you see in a pot of water when boiling a few eggs. The bubbles not only form at the heat source, but over the entire surface of your pot. Anytime there is an air bubble between the heated surface and the transfer liquid, there is an insulative barrier. This is why it is extremely important to recreate the heat transfer experiments as closely to engine operating temperatures. Without cavitation, the heat transfer between metal and liquid is much improved. I feel this is the biggest reason to use these coolants.
In Baddrapp's 650, according to thermal documentation, he should be experiencing a 16% rise in coolant temperature over when he was using the 50/50 coolant. A 16% rise from 215°F is to 249. This is clearly not the case, in fact, his cooling fan does not cycle nearly as much as before. As his engine temperature increases from 215F-> the heat transfer ability actually increases due to the higher boiling point and lack of insulative barrier. This is why his fan only remains on momentarily rather than staying on or for longer periods of time like it has before.
I am no longer employed by ZipTy, but it is my honest opinion that all motorcycles and small vehicles should use water-less high temperature coolants, whether it be xf2, Evans or others currently available.
