> This topic reminds me of the first time I ran into this. Shelby was
> running the Mustang at the Trans-am races at Riverside raceway in
> Calif. It was the middle of summer and very hot. The motors were over
> heating bad until we installed a blanking plate with a 5/8 hole in the
> water outlet. That cured the problem with over heating. Over the
> years I
> have found that around 5/8 to 3/4 inch works the best in roundy round
> cars. I have heard many different reasons why. All I know is what
> works
> I go with because I have enough other problems to keep me busy. Doug
> Odom in big ditch
> _
I think that the reason for this was likely that that water was
running too fast for the radiator to properly cool it before it got
back to the motor, and it wasn't able to remove as much heat. With a
larger radiator, or multi gallon reservoir for the water, you likely
wouldn't have encountered any problems.
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