maximum engine temp

freshayr said

i just spoke with a local radiator man. He said it sounds like a typical situation where the fan is not big enough. In other words, when I am doing 70 mph the fan is actually reducing the air flow beacuse it is not aggressive enough. Makes sense to me, I have a little stock fan on it. Going to try an more aggressive fan.

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Sorry, but the rad. man makes no sense to me. You say you got a 4 pass aluminum, shrouded rad, which is the ultimate, you shouldn't have a heating problem going down the highway. You would need an aggressive fan for tooling around town but you'll sacrifice some horsepower. Another caution is to be careful using an infra red temp. gun. Don't point it at shiney surfaces like stainless steel cause it'll give you a faulty reading, unless you can adjust the emissibility setting. One thing that will cause the engine to overheat is if the water pump impellor has a lot of corrosion on the impeller blades. At high RPM the pump is being asked to increase the cooling flow and can't hence try overheating.You'd think the opposite would occur but I've had this happen to me. :evil2: