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Quote:
Originally Posted by BobR35
So over the past 2 months I've been dealing with and trying to figure out the problem with coolant running out the overflow at the top of the radiator. The problem is that after the engine warmed up to operating temp and being in traffic, the coolant would push out the overflow tube. If I were moving, regardless of speed, everything is good. I replaced the water pumps with new high flow pumps just as a maintenance and peace of mind thing. I then replaced the 160 tt with 180, no change. I even tried running two thermostats on each side, the 180 at the bottom and 160 at the top, just to see if this would regulate/slow up the flow. Boy, that was a waste of time. The temp ggs went nuts, up - down-up-down. So then I decided to pull the radiator and have it reconditioned. Yesterday I installed the "new" radiator and decided to install washers inside and at the top of each hose, where the radiator attaches to slow down the flow. I used 3/4" I.D. washers and drove the car on a short 80 mile trip to test this out. I used hose clamps just below the washers to hold them in place. The outside temp reached 78* and the engine ran at 180* steady. I also engaged traffic in town. This is where the problem was, after a run and then in traffic at idle, the TT's would be wide open and coolant would spew out the tube. Well, problem solved!! No water loss all day. It seem that the flow going into the radiator over took the tank and pushed out the water. I do believe that the radiator being in good health did help a small amount. The inside condition of the radiator wasn't bad, 6 tubes were restricted and one totally closed. But it works as it should now and I'm happy!
So just my input after researching and trying to figure this mystery out I wanted to share with anyone experiencing similar issues. Hope it helps someone....
2200 miles in 7 weeks so far and lovin the ride!!
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You need to let as MUCH coolant flow though the radiator as possible.
Why did you put on high flow pumps and want to slow the flow? You
need a pressure cap and a recovery bottle. As the engine cools and as
the temperature gets to 170 a vacume is formed and sucks the coolant
from the bottle back into the radiator this where the pressure cap comes
in. The overflow tube needs come out of the filler neck. Take a look at
the top plate in my radiator and the tubes, I did not polish them this was
done by the pressure and flow of the non restricted Skips high flow turbine
impeller pumps over a period of time. Don't use stats until it runs cool.
Stats do nothing to cool an engine just make it run hotter. Make sure you
get stats with large flow openings or they will restrict the flow.
Robertshaw stats have large flow openings. A better fan and even a shrould
do even better. My 39 pickup ran at slightly high Idle at a V/8 show a
number of years ago on a day that was over 100 degrees for over 6
hours and never got to 180 degrees. I went to lunch and let it run and
Ken from Conneticut watched it for me. If I raced it up a little the temp
came down. G.M.