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

[Elton S]

As a related question, what is the direction of flow through the radiator -
up from the bottom or down from the top?
Elton
BJ7

On Tue, Mar 29, 2022 at 11:44 AM Michael Salter <michaelsalter at gmail.com>
wrote:

> 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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