[TR] Apologies for the mail filter, and a question about carbs

[Randall]

> http://www.geocities.com/tucson_british_car_register/tr4-five.html
> 
> Which shows a "breather" on the side.
> 
> What exactly is the purpose of such a breather?

As you surmise, this was the first version of crankcase emission control; a
replacement for the "road draft tube" used in previous years.  In theory,
instead of being released into the atmosphere, any crankcase fumes would be
directed back into the carburetor intakes and burned.  Thereby greatly
reducing hydrocarbon emissions, a major component of smog.

> Originally I had thought I
> would just connect them together to help maintain some sort of
> vacuum balance, but I'm probably wrong on that..

No need for that, IMO.  Just close off the holes somehow so no unfiltered
air gets into the engine (although running a hose between them would be one
way to close them off).

Randall