[Healeys] Thermal Switch Hole in Cylinder Head

[m.g.sharp at sympatico.ca]

Others have answered the question, but I have one of the approximately 1500 cars to which that wonderous thermo/electro/mechanical device was fitted so attached pictures.

 

I would prefer a choke, but the novelty factor is too great to remove it.  The “Otter” switch (the thermo-switch) only activates the “auxiliary starting device” under a narrow temperature range  and is either on of off, so you cannot vary the mixture.  To gain more control the PO wisely wired the device to a switch on the dash.  It work reasonably well, but because you can’t vary the mixture, it is “right” for only a few moments as the engine warms up.

 

However, apropos the recent posts on black sooty emissions being directed at unwanted guests, I can activate this and spit a nasty rich mixture containing unburned raw fuel at them when wanted!

 

Cheers, MIrek

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Harold Manifold via Healeys
Sent: April 3, 2021 3:31 PM
To: Ken Fleming via Healeys <healeys at autox.team.net>
Subject: [Healeys] Thermal Switch Hole in Cylinder Head

 

Hello,

 

What is the history for the Thermal Switch Hole in the cylinder head. Item 8 in the attached drawing. Some heads have the hole in the casting and it is blanked off and in some heads the hole was never added.

 

Harold Manifold

 

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