I am impressed with the quality of the tank on your Roadster IvorMog/Bob, I also like that it has a window incorporated to allow monitoring of the coolant lever within the tank.
GoMoG, thanks for the link to the article though as ever seems to be the way, the use of different terms seems to have the possibility to confuse...? Another example of being separated by a common language..? (-:
The base of my limited understanding is that in the case of a Morgan (and other vehicles) is that the requirement for a remote tank, would seem to be down to the lack of room to simply fit a large enough radiator, on which there might be space enough for it`s in-built top tank to contain enough air space for the required amount of expansion of the coolant as the engine rises to normal operating temperature.
In times past before aerodynamics became a primary consideration requiring ever lower bonnet lines, there was room for adequate in-built top tanks on radiators.
Back in time it was the norm was to ensure that the water level in the rad was such that it was not filled to the top, but to a level just above the top of the cores visible through the filler cap, thus ensuring adequate airspace was left within the rad for coolant expansion...?
If one overfilled the rad, then as the engine temperature rose up to normal operating temperature, the expanding coolant would lift the seal in the (two way) rad cap, and blow off the excess down the overflow/vent tube fitted in the neck of the rad.
As the coolant cooled/contracted, the secondary valve in the rad cap would be sucked opened, which would then allow air to be sucked back through the same rad filler neck mounted overflow tube, which had previously provided an escape route for excess coolant..?
The result being that the combination of a normally closed dual valve pressure cap, and a rad with an overflow tube vented to atmosphere, would arrive at creating the systems normal operational water level, from a situation of being over filled.. while avoiding creating vacuum in the system enough to collapse flexible radiator hoses..? The overflow tube normally routed down the side of the rad the end pointing down onto the road surface in a bid to expel the mix of steam and water as safely as possible.
I think I understand the design and operational requirement of a remote expansion tank, though admit to not fully understanding the purpose of a recovery tank... I suspect this terminology may confuse more than just me, perhaps causing some to think that both tanks perform the same purpose...?
It would seem that an expansion tank is just an extension of the radiator, and only required in the system due to the lack of space for a radiator with an adequately sized in-built top tank..? That being the case, the expansion tank and all it`s pipework are exposed to whatever pressures might build up within the rad....With that in mind whatever tubes might be fitted to determine the level of the coolant within an after-market tank, would seem best to be proven to handle a higher pressure than that at which the pressure cap is rated at...? A mix of steam and water escaping under pressure can cause serious burns or worse..
I would be more than happy if someone here might explain the idea behind a recovery tank as different from an expansion tank.... Or is this just another example of fake news...? (-:
