Morris Minor Owners Club

Ahem,

A liquid in a high pressure environment has a higher boiling point than when the liquid is at atmospheric pressure

From here:http://en.wikipedia.org/wiki/Boiling_point
The laws of physics are really rigid, otherwise blokes in sheds would be building perpetual motion machines on the sly.

Well this all seems interesting (to me anyway) and as a non physics person a little confused, but on looking at the wikipedia link I have to side with Steve as he is talking about reduced pressure not a reduced boiling point and the article quotes

A liquid in a vacuum environment has a lower boiling point than when the liquid is at atmospheric pressure. A liquid in a high pressure environment has a higher boiling point than when the liquid is at atmospheric pressure. In other words, the boiling point of liquids varies with and depends upon the surrounding environmental pressure.

So I see it as saying that the temperature will rise as its not under as much pressure as when its contained but not necessarily to boiling point.

Now I am completly confused.

The TEMPERATURE will not change in the slightest. The BOILING POINT will of course change depending on the pressure! Higher if raised pressure, lower if reduced pressure. Hence tea made on top of a mountain is useless - since you can't get the water up to the correct temperature for good infusion!

I know that without the rad cap the underside of the bonnet gets redecorated

Which is why I said to leave the cap loose, not to remove it.Left loose, the system will not pressurise and therefore will not force water out of said split but will still be contained in system.

Thank You Kevin. I have been using this trick as a "Get you home, But get it sorted fix" for more years than i like to remember. I had to use it once myself when I split the top hose on a 525 beema. It was Sunday hight on the M25. And yes it did run hotter!

8009STEVE wrote:

I know that without the rad cap the underside of the bonnet gets redecorated

Which is why I said to leave the cap loose, not to remove it.Left loose, the system will not pressurise and therefore will not force water out of said split but will still be contained in system.

Aah, me being a numnut agin!

I just stuck a jubilee clip around the split in the end and it held out for a 70 mile round trip. Still need to replace the little sod though!

Glad you got going in the end

Is the leak really that bad Dan? Send me a pic of the hose I might be able to sort something

Is the leak really that bad Dan? Send me a pic of the hose I might be able to sort something