Agree with the above. Plus keep in mind that when you are riding and get caught in some rain the motor is still running and, therefore, probably really doesn't cool down from the rain. Rapid changes in temperature could really ruin your dayDarque_Bike636 said:It is very different. Heat transfer in fluids is dependent on a number of things, but a big one being the flow rate across the surface. Your hose cranks out probably something like 3-4 gallons per minute. The falling rain in an average shower and subsequent spray off the road is probably more like a couple of cups an hour.Rbeane60 said:Shouldn't be any different than if it starts raining on you in the middle of the ride.
Never spray a hot motor or exhaust with cold water. I always like to have my engined warm just to the point where it isn't too hot to touch.