Thermosiphon Cooling Systems

[Mudgey]

Hello people,

I have spoken with a number of customers whom have enquired about fitting electric water pumps to their thermosiphon cooled cars, mostly the idea is to prevent steam pockets forming preventing coolant flow. I am looking to offer a billet hose joiner which can be installed into a straight section of lower radiator hose with a blank in the middle and hose connectors to allow the fitment of a remote electric pump. This should make installation a breeze and look more professional than trying to adapt up a load of reducers together. I'll also add a threaded hole for a rad fan switch should the customer wish to add this at a later date.

I was wondering if owners could measure their hoses, I imagine the following sizes are used but it would be great if a few owners could confirm this:


1.5"
1.75"
2"
2.25"
2.5"

[Allan L]

That's an interesting theory about steam pockets. Is there any evidence that there is a problem of that sort, or is this a solution looking for a problem?
I presume you expect the electric pump to run all the time - with it stopped, you may find the thermosyphon doesn't work as the pump would add blockage to impede what is, at best, a very small circulating force.

[Mudgey]

Some engines are renowned for developing steam pockets around exhaust ports in high output low vehicle speed situations, especially in car trials where on some occasions the vehicles aren't moving. Fitting a pump isn't a perfect fix but it stops overheating issues.