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How important is the PSI rating on a radiator cap on a drag only car? What PSI is everyone running? Thanks Chuck



I think its very important. A high PSI cap on a race car is extra insurance to prevent a boil over blow out. Most of us who race deal with heat issues.

Dont run a cap that puts you on the edge of a boil over. With a cap 1 psi short of preventing a boil over, the water vapor pressures can double

I run a 16# cap, it should be good for around 240* before it blows.







You are suppose to have a over flow can... watch it
to determine if a higher cap is warranted... on my
car I have 2 caps on the system... yes 2... one is
on the radiator basically as a plug and then I have
a small reservoir that my return lines from the heads
goes to... that is the highest point so I made it
so a cap is there... I believe thats a 7# cap...
the over flow is empty except when I had a bad seal
on the old cap





Im not sure I understand your head return line system resevoir 7# cap system. Whats your cap psi on the rad?


Yes, all cars are required to have a overflow can. Ive got one too.


A boil over is a violent event in terms of pressure. Preventing this with a stronger psi cap from the get go is a good idea adding extra safety insurance.

Once a boil over occurs the Vapor pressures skyrocket. Prevent that boil over with a few extra pounds at the cap . Priceless ,