Topic: Pressurized Radiator for 1940


khaysb    -- 08-12-2015 @ 8:30 AM
  I have a rebuilt split core" radiator in my 1940 convertible club coupe and want to know if I can pressurize the system with a 4 lb radiator cap without harming the cooling system. I have new Bob Drake water pumps and 170 degree thermostats. My intent is to further insulate myself from overheating situations by increasing the boiling point. Is a 4 lb cap safe for my car?


joe b    -- 08-12-2015 @ 10:12 AM
  I have a 1941 with a split radiator. I have been running a 4 lb. cap for 10 years with no problem. I have 160 degree thermostats and no overheating.


TomO    -- 08-13-2015 @ 7:51 AM
  The 40 radiator has the overflow coming out of the top of the tank and the cap is below it on the slanted portion of the top tank. A pressure cap will not provide pressure unless the overflow is modified or you use a pressure relief valve like the one from Skip Haney in the over flow.

I have been using the pressure relief valve and a 4 lb pressure cap for about 15 years now and it has worked fine for me. I installed the pressure relief valve at the bottom of the overflow tube using flexible fuel line.

Tom


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