Combined swirlpot and expansion tank

[zombeh]

greymrj said:

As I understand it the swirl pot(which is a bit of a misnomer anyway) is there to allow air to escape from the almost boiling water from the heads, which would not be a requirement if the rad was higher than the heads as in most cars. So the air chamber must be above the water in the heads (either physically above it in the swirl pot or accessed as at present through a pipe from the top of the swirlpot, which has the same effect).
But whether arranging this in a single tank would be convenient or a better arrangement in this particular engine bay I am not sure.

I would agree with exactly that, it's done the way it is simply to fit it under the bonnet.

[v8s4me]

greymrj said:

....Now the clever bit would to get that volume of air to the optimum size to keep the system from rising above the optimum level or pressurisation, whatever that is!......

By pure fluke we might have found that to be around 500cc. It will be interesting to see from Paul's sight tube how the level varies between hot and cold. My money is on the level never dropping low enough to allow air into the swirl pot and never getting high enough to vent off.

[Oldred_V8S]

v8s4me said:

greymrj said:

....Now the clever bit would to get that volume of air to the optimum size to keep the system from rising above the optimum level or pressurisation, whatever that is!......

By pure fluke we might have found that to be around 500cc. It will be interesting to see from Paul's sight tube how the level varies between hot and cold. My money is on the level never dropping low enough to allow air into the swirl pot and never getting high enough to vent off.

But I now have twice as much shiny stuff!