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just wondering?

Discussion in 'The Garage' started by bigbadchev84, Aug 2, 2006.

  1. bigbadchev84

    bigbadchev84 1/2 ton status

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    i was going to replace my crappy old radiator cap with all the other stuff i gotta get done on my car, i went to buy a new one today and seen that there are 13psi and 16psi caps..... why are there different ones?
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

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    more pressure= higher boiling point..

    The higher the cap is rated for,the higher the temparature of the coolant gets before it will boil....water boils at 212 degrees in open air,but pressurize it to 15 psi and it will not boil until 258 degrees or so...a 7 pound cap is often used on older radiators that might pop a leak under the higher pressure of a 16 lb cap--but the coolant will boil quicker..I've used a lot of 7 lb caps without troubles though..:crazy:
     

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