Join Date: Aug 2009
Location: Washington, the state
I need to see a diagram of the oil system in the bikes. Is there a thermostatic valve anywhere to divert oil away from the old air-cooled or new water-cooled cooler when the oil is cold? At what point in the coolant system does the coolant go to the new oil cooler?
Normal engine oil temperature in the sump is above 200°F, maybe up to 220°, and a max of something like 250°F. Aftermarket thermostatic valves for add-on oil coolers usually begin to open at 180°F; I don't know about OEM valves. Sending the hot coolant to the oil cooler before that coolant goes to the radiator is one common way to do it--many large diesels are set up that way, and my Volvo turbo car engine had its oil cooler in the hot tank of the radiator along with a thermostatic valve to bypass the cooler until the oil was hot.
The early pics of the '14 DL1000 showed an air-cooled oil cooler. Later pics showed a water-cooled oil cooler.
Also keep in mind that the air passing over the outside of the engine and around the sump is a major source of oil cooling, as is heat transfer through the engine metal to the coolant. Cold weather riding will have much cooler oil, and very hot weather riding will have hotter oil. I like an xW-50 oil in our engines in very hot climates to help ensure good protection at the hottest points inside the engine.
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