[Healeys] Coolant bypass port in the head - 6-cyl

[Michael Salter]

As Gary points out, and far as I have been able to figure out, the bypass
passage is open when the engine is cold, the idea being that by "short
circuiting" the radiator the coolant in the heater and bypass passage will
warm up more quickly and the heater will produce heat more quickly.
We had a slew of the "shrouded " type thermostats that I bought when Smiths
Canada closed down. The part number was 43570/28 and we used to sell them
to customers who reported overheating problems.
I stopped promoting them as a potential solution to overheating issues
after being taken to task by a customer who did an extensive study of the
issue and proved, at least to my satisfaction,  that they improved cooling
not one iota.

M

On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigrist, <healey.nut at gmail.com>
wrote:

> I don't know if this has ever been answered before, but where does the
> little bypass port begin?
>
> What parts of the head does that bypass come in contact with?
>
> When do you want to cover the port with a sleeve (when coolant is hot or
> cold?)
>
> I ask because the old bellows style thermostat will cover the bypass port
> when the thermostat opens
>
> then I have another wax thermostat and the sleeve actually cover the
> bypass when it is cold, and doesn't cover it when the thermostat opens....
> so it works exact opposite to the old bellows style thermostat.
>
> confused....
>
> Cheers,
>
> Alan
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