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Originally Posted by jojoegen
hey El,Don't forget,this engine is a furnace.
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Well the reason I am posting here is I have some experience trying to cool a furnace of my own: An all-cast iron 427 (block AND heads) inside Hurricane's body (quite thick fiberglass) in the fiery hell of Houston TX, where the temps have been at or above 100 every single day I have been in the car in July.
Quote:
Originally Posted by jojoegen
If the pump is too slow and the heat is generated too much,then at idle ,the water can't cool enough.This is evidenced by the fact that on a cooler day , no problem.You dig? Does it make sense now?Also don't forget that when looking in the expansion tank,there is very little flow at higher rpm's.
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I get that, same condition as I see in my car when I look into my tank, very little noticeable circulation, not what you would expect. So I swapped out the Ebrock water pump, made no difference.
Assuming your engine is fine, your radiator is sufficient (may not be) this is likely just a heat exchange issue. This is why on cool days, and down the highway you run cool. But on hot days, sitting idle, you run hot. The radiator/fan combo is not dissipating enough heat from the coolant as it passes through the radiator. It doesn't look like it would, but proper shrouding and more fan muscle makes a HUGE difference in cooling these big engines.
Now one thing to consider is that both of your pulleys are both 5.2" and stock pulleys like mine are 6.5", so your water pump is turning 20% slower at a comparable idle (I think I got that right.) That could be contributing.