Originally Posted by erniejen
I think Voxmagna has a good point re coolant flow/material about the fins and radiator screen. I have taken both my 07 and 08 GT to Death Valley in July and August without heating problems even though ambient temps were in the 40-45 C (120-122 F) range. Granted, I kept the bike at a good pace, but in the park you are restricted to fairly slow speeds and summer traffic at the center can be numbing.
My current ride (08 GT) has 53K miles and never seems bothered by our So. Cal desert temps that have been fairly high this summer.
Best of luck to you in the investigation. Let us know what you discover.
Ride "coolly" and well
I know I am on a KRS in a relatively cool U.K climate. But I have been all through the BMW cooling system design on my bike.
These bikes are not called sport bikes for no reason. Sport means fast riding when you get plenty of airflow through any size of radiator. What these German designers fail to realize, is cooling problems in high ambients when the bike is hardly moving should be where they set their design brief.
I am afraid the practical improvement solutions are difficult. Some give a small improvement, others a lot of work but big gains. Fundamentally, you have to switch off all those ideas of some magic coolant mix and concentrate on how to get heat away with little speed related airflow and that 'boils' down to radiator design - core size/surface area, electric fan specification and how it operates.
Ideally I would like to have increased the radiator sizes, number of rows and core depth but you can be limited with the space to work with up front. Then there is the Jap solution of a custom curved radiator with the added problem of plastics customization.
I went for the lowest cost option on my KRS. First I learned the open bypass system at low rpm significantly reduces water pump efficiency, so I throttled mine down with an ali insert made from rod and drilled pushed into the bypass hose (8-10mm drilled hole I think).
Then I discovered that the BMW fans only cover half the radiator area. There's another issue in that they do not seal and shroud the radiators, so air can be lost around the sides. Not a lot you can do about that in the space though.
The big bang for the buck in my case was to add two more fans to the front of each radiator, each additional fan being at least as good spec. wise as the oem but they are not nicely ducted out through the plastic. But I did think about and design a cunning control system for them. I was also careful to make a lot of digital temperature measurements to check I was getting real improvements.
The low header tank is not a problem, just something to make life more difficult. Obviously what I did was not your bike model, but the principles may be the same. There is no quick fix if you want to get a decent result.
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