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Original radiator cap pressure?


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Does anyone know for sure what the radiator cap pressure rating should be? My current cap is an AC type RB11 cap, rated at 15psi. Looking to replace it as one of those easy things to switch out, but noticed that the SJ radiator cap is rated to 10psi (https://www.sjsportscars.com/parts-and-accessories/SJ046K0002.htm). I know there is very little difference, all things remaining the same between cap pressures (other than an increased boiling point of around 9 degrees Celsius), but what was the original cap pressure on the Elite/Eclat?

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I was just going to write I checked the workshop manual, but couldn't find a figure for pressure. Nor in the workshop manual for the Excel. Guess my version is not complete.

I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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