[Healeys] Thermal Switch Hole in Cylinder Head

[Alan Seigrist]

The aux carb works well if connected straight to a switch on the dash
rather than using the thermoswitch.  I have a Jag Mk IX with the aux carb
and it does work well, although I would say a standard choke probably uses
less fuel, when the aux carb is on it is thirsty, that's for sure.
Thankfully on the Jag it has so much pull that as soon as I get going I can
turn it off... yes and you are correct the 3.8L doesn't cough back into the
HD6 carbs at all....



On Sun, Apr 11, 2021 at 4:45 AM wwycoffbn7--- via Healeys <
healeys at autox.team.net> wrote:

>
> Mirek,
>
> I am also a caretaker of one of the few cars that came equipped with the
> auxiliary carburetor instead of a mechanical choke.  The car came to us in
> 1982 and I fairly quickly got the hang of managing it.
>
> However, it did seem a bit worrisome because the engine would occasionally
> cough before it was properly warmed up.  When that occurred the back
> pressure would cause a fine mist of gasoline to blow out of the thermo carb
> and spray throughout the engine compartment.
>
> During a freshening up in 2009, Tom Kovacs related to me that this
> situation caused a lot of these thermo carb equipped cars to burn and often
> be destroyed.  This was apparently one of the reasons this feature did not
> last long in production.  Interesting in that it seemed to work well on
> Jaguars.   He changed out the system to  mechanical choke.
>
> The cylinder head with the otter switch, intake manifold and other parts
> are stored in the garage in case a future owner wants to retrofit.
>
> Best Regards,
>
> Bill
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