Quote:
Originally Posted by bruce71198
..... if I remove the excess heat with the coolant that should alleviate the hot oil, correct?= bigger radiator?
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Sometimes a bigger radiator can help, but the rate of coolant flow should be increased as well. If the specific heat of the coolant is essentially constant and the coolant flow rate is constant at the rated engine speed, the coolant temperature drop through the radiator will be constant.
A cooling system that has a heat load and coolant flow rate that results in a 10 degree F coolant temperature drop through the radiator will have that same coolant temperature drop whether the radiator has a very small face area and flat fins or a very large face area and bigger louvered fins.
In other words a water pump with a higher flow rate maybe needed. (side note* the water pump impellers for the Ninja 250 are different than the Ninja 300, as well as the water pump P/N#'s)
Cooling both the oil and radiator coolant separately can help reduce overall engine temps with the stock flow rates for both oil and water pumps still intact. Also improving airflow to not only to the radiator, but the engine as well, is critical.
Having a really thin crankcase-head oil tube sandwiched between a hot engine and super hot exhaust doesn't help at all. Putting it in front of the heat has enough benefit to potentially drop the temp just enough from being critical. It's a little easier to keep the bike cool when the ambient temps are below 90 degrees fahrenheit, so every little thing counts.
Just my 2 cents.