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Topic: Expansion tank cap (Read 363 times) |
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a900one
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Expansion tank cap
« on: Sep 26th, 2009, 2:11pm » |
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What pressure should the cap be, eg 12psi blow off , mine is only releasing pressure at 18.5 psi  . Is this the reason my radiator is leaking / ballooned.
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Snoopy
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Re: Expansion tank cap
« Reply #1 on: Sep 26th, 2009, 8:25pm » |
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I think THIS will give you the information you require
120kPA equates to 17.4 lbs pSq In the conversion is .145kPA.
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a900one
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Re: Expansion tank cap
« Reply #2 on: Sep 26th, 2009, 10:16pm » |
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Thanks snoopy I saw that but did not know what it was in p s i. The granada v6 had a cap set at 0.8- 1.0 bar so 17.4 seems high, I know thats what Ford set it at but what will that put the boiling point up to, I think 1 bar puts it up to app 110o/c.
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Snoopy
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Re: Expansion tank cap
« Reply #3 on: Sep 27th, 2009, 8:04am » |
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I bar is 15 lbsp sq in from what i remember so that is about the same . As you correctly state puts the BP up to around 110c which is why you have to be Very careful when opening a HOT car filler cap as it can boil vigourously with the sudden reduction of pressure
Actually 1 bar is 14.5037738
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a900one
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Re: Expansion tank cap
« Reply #4 on: Sep 27th, 2009, 8:02pm » |
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Is the 2.3 a lower pressure.
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Snoopy
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Re: Expansion tank cap
« Reply #5 on: Sep 28th, 2009, 8:45am » |
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I think they all work at the same pressure. Ther is only one advice sheet for them on the TIS so I have to presume so .
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a900one
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Re: Expansion tank cap
« Reply #6 on: Sep 28th, 2009, 6:29pm » |
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Just been in to Vospers and its the same cap for both. The top of my rad had ballooned one of the flat tubes had gone into a round tube and had broken the top bar . Now its possible that the cap had stuck shut as I had to put the pressure up past 25psi to get it to open.
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