Quote:
Originally Posted by cvetter
It was Alan's experience that his air cooled Honda CF 230 severely overheated at 70 mph, into the 30 mph headwinds, sitting upright and comfortable. Even spraying water on the head at speed could not keep the engine head temps within safe range. And that was in 65 degree ambient air!
It is too difficult to get the incoming air routed around the front wheel and fender to the engine.
I strongly suggest that you don't waste your efforts on an air cooled motor. A radiator is much easier to feed with cooling air.
Craig |
what Craig said. I had the same problem with my CB250 air cooled motor getting too hot in the hot summer months down here in the south. My bike had NO FAIRINGS and the cylinder head temps got past 375 degrees. I noticed power dropping when it went past 350. I could not find anyone who could tell me how hot was too hot for the little CB250/rebel 250 engines. I seem to remember VW Beetle air cooled motors were toast after 385 degree F. The hotest ambient air I have been in on a bike has been about 104 degree F
Some of the industrial diesel engines used for bike conversion have fans to blow air over the cylinders, since they are designed for stationary industrial, use. Maybe use a NACA duct to feed the fan end of the motor fresh air if you have your heart set on an air cooled motor?