Quote:
Originally Posted by Tyler Townsley
Lane Goldstein (Fastlane) used a switch in the cockpit to turn on his fans with engine off to cool down his motor between runs. You can do the same thing by turning off the motor but leave the ignition on and turning on the A/C both fans should come on.
Tyler
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Fascinating thread!
Whenever this topic comes up (not just with LT5s exclusively) it occurs to me that unless one also had an electric water pump, there wouldn't be much (or any) significant water circulation thru the radiator when the engine was not running. So, running the fans would only cool that slug of water in the radiator, and except possibly for miniscule(?) flow due to convection currents (cold sinking, hot rising, etc), there would be little cooling of the engine itself, no? And, once the temp of the thermostat was reached, even convection current would be cut off when it closes.
Just thinking out loud here -- I suppose with continued cooling, the slug in the radiator could eventually sink to ambient temp, so when the engine is re-fired, there would be a sudden overall temp drop as the cool slug from the radiator is mixed with the water that remained in the engine's water jacket; how much the temp would drop would depend on the temp differentials (radiator vs. block) and the proportions of hot and "cold" water being mixed.
Ignorance is bliss, or in my case, makes me dubious; re cooling fans significantly cooling the engine at shut-down, especially w/o an electric water pump. But, then again...I could be "all wet".
If time is of the essence, every little bit (of cooling) helps, I suppose.
I think I'm saying that unless there is a water pump involved, running the fans is not going to be nearly very effective in a short time. In the absence of an electric pump, I suppose the engine could be fired for a few seconds to force an new slug of (hot) water from the jacket into the radiator, thus expediting the cooling.
(Kinda makes one ponder getting an electric water pump, huh?)
P.