TVS switch on '74 Spit

[tom.omalley@channel1.com (Tom Omalley)]

>There is one part on this car that remains a mystery to me.  What is
>purpose/function of the Thermostatic Vacuum Switch?  This switch is
>the EGR system and is located on the lower radiator hose.  It has
>vacuum lines running to/from it to the carb, EGR valve and the 3 vapor
>separators.

>Barry H. Adams
>74 Spitfire

This part of my '74 has been removed by the P.O. so I can't tell you
anything specific I'm afraid.

Conceptually though, the TVS is intended to delay the deployment of the
emissions gear until the engine has reached operating temperature. I
think the vacuum retard line for the dizzy might pass through this
puppy too.

Regards...
Tom O'Malley
'74, '77 Spits