SORTED i need a new radiator cap - quick question

[stuartp]

i kind of did a brian harvey and ran over my own radiator cap

 

checked water level, oil and tyres and somehow forgot to put the radiator cap back on

 

drove away and managed to squash it when it fell to the ground

 

doh!

 

anyway i'm going to get a new one today (i'll probably pop to ratsport in my lunch break) my question is, is there any reason why i might want the 22-24psi one? (it's just a standard pinto rad) or should i (as i suspect) get the 18-20psi

 

http://shop1.actinicexpress.co.uk/shops/Rat_Sport/index.php?cat=Radiator_Caps&ActinicSID=f4fddeb21c26f44a7d40139e961ab504

[MM77]

Higher pressure = higher boiling point.

 

But thats all I know. Have wonderered this myself.

[stuartp]

higher boiling point sounds bad to me

 

i'll stick with the lower pressure one i guess

[Fishtailparka]

Higher boiling point is good. It means the water is still water rather than steam. Having said that, it probably isn't a good idea to increase the pressure in the system to more than it was designed for.

The rad cap works as a pressure relief valve, if that doesn't release the pressure then something else might. (heater matrix for example )

I would replace with the same as you had, but not the flat-pack version.

[stuartp]

just seen the standard 'Chrome Radiator Cap' on the ratsport page is 15psi and that looks very much like the one i have squished so i reckon i'll get that rather than the 18 to 20

[Fishtailparka]

Sounds about right. I haven't got a book of words just handy for a pinto, but xflow and 2.8 are 13lbs/inch2

[stuartp]

old one was 13lb, i just managed to decipher it.

 

i got a nice shiny chrome replacement which is 15lb