Thread: Choosing a radiator cap?

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Your cap pressure is going to be limited by your radiator. If you're running one of the aluminum core units like PRC or Walker I believe 15 to 16 pounds is your limit - PRC sells 16# and Walker sells 7# & 15#. You may need to check with your radiator supplier to see what they recommend as an upper limit. Do you have a coolant recovery tank? I would think one would be necessary in your FL heat.

Originally Posted by rspears

Your cap pressure is going to be limited by your radiator. If you're running one of the aluminum core units like PRC or Walker I believe 15 to 16 pounds is your limit - PRC sells 16# and Walker sells 7# & 15#. You may need to check with your radiator supplier to see what they recommend as an upper limit. Do you have a coolant recovery tank? I would think one would be necessary in your FL heat.

I don't have a clue what radiator it is, but I'll check when I get back to the shop in the morning.

It has a small overflow tank on the side (I think 2"x15")

I was thinking about getting one of these thermometer caps since I'm not quite sure about the accuracy of my temp gauge

http://www.jegs.com/p/Mr-Gasket/Mr-G...74786/10002/-1

Debating between the 16 and the 20

Originally Posted by 98 SNAKE EATER

I don't have a clue what radiator it is, but I'll check when I get back to the shop in the morning.

It has a small overflow tank on the side (I think 2"x15")

I was thinking about getting one of these thermometer caps since I'm not quite sure about the accuracy of my temp gauge

http://www.jegs.com/p/Mr-Gasket/Mr-G...74786/10002/-1

Debating between the 16 and the 20

Another way is to use an infra red temperature gun to shoot your block, heads, radiator, etc when at operating temperature to see what you really have through the system. On the cap, you really need to know what your radiator is good for before you boost the pressure over 16psig, IMO.