15 psi radiator cap

bsharp · Post by **bsharp** » Tue Jul 08, 2014 2:00 pm

Have a 78 fiat 124 spider. my AutoZone book calls for a 15 psi cap, but I can only find a 13 PSI and it keeps pushing the water out--. I can get a 16 psi and would that make a difference --anyone got an idea if a 15 psi is really required

So Cal Mark · Post by **So Cal Mark** » Wed Jul 09, 2014 1:54 am

each lb of pressure raises the boiling point 3 degrees

RRoller123 · Post by **RRoller123** » Wed Jul 09, 2014 5:07 am

Mark, that is interesting, Do I assume then that a 15psi cap raises the boiling point from 212 to ~257? I.e. is the relationship roughly linear?

Pete

So Cal Mark · Post by **So Cal Mark** » Wed Jul 09, 2014 9:48 am

yes, each lb of added pressure raises the boiling point 3 degrees. Remember, as soon as you loosen the cap and release the pressure the water will boil. If the cap keeps blowing off pressure, I'd look into a potential head gasket leak or lack of circulation

15 psi radiator cap

15 psi radiator cap

Re: 15 psi radiator cap

Re: 15 psi radiator cap

Re: 15 psi radiator cap