Quote:
Originally Posted by UKjohnnycobra
Hi all, I'm looking for some advice on engine cooling.
I have a stock Ford 302 in my Cobra which I currently run with a 160F thermostat. The engine runs at around 180F when moving, but the minute I stop at traffic lights or in slow moving traffic, the temperature rises very quickly (less than a minute) to 200F or greater and the elecric fans can just about stop it going above 200F but cant get it back down to close to 180. When I get moving at speed again the temperature comes back down to 180F after a couple of minutes. The car is not boiling over but this is very annoying as it means that the fans are on any time I am stopped and for several minutes after I drive away
I have a new Griffin two row aluminium rad which is more than enough cooling. I have two 12 inch fans which are definitely blowing in the right direction. The themostat is new and drilled at 12 oclock. I have swapped out the stat and the problem persist with different temperature stats. The water pump is new. The problem existed with the old pump too. I have a bypass hose in place. There is no air in the system; it has been filled and burped multiple times an I can check the head fluid level through a fitting on the manifold. The block, heads and rad are completely filled. I use a 50/50 mix. I have flushed the system multiple times.
I am thinking that maybe the pulley ratio is wrong and the pump is not turning quickly enough at idle. I have a 6inch crank pulley and a 5.5 inch water pump pulley. Any thoughts on this? What are the correct pulley sizes/ratios?
Thanks in advance
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fan shroud? are there spaces around the rad' that air can get thru without going thru the core? it takes quite a bit of cfm to pull the air from the nose to the rad'. sometimes two fans is more restrictive than one large one.
post some pics....maybe we can see something your missing....
Fred