Quote:
I’m a bunch confused here.
Thermac controls inlet air temperature into the intake and cylinders.
Not into the crankcase.
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Well, it does both on systems from maybe '79 and up. Closed PCV system connects to the manifold or carb base at one end and the air cleaner at the other. Under most conditions the carb end makes vacuum and draws air from the air cleaner into the valve cover, through the engine, then into the carb base. In this system air temp in the air cleaner is warmed through thermac so air going into the PCV is thermac air.
It's up to the builder of course and ultimately it likely makes only a small difference. My '36 Plymouth hasn't gotten a PCV even though Mopar offered a "Vacuumatic Crankcase Ventilator" modification for those engines. I keep thinking about it and it's likely I'm going to do it eventually. The garbage the builds up in that block is incredible, even running detergent oils.
For closed type PCV look at the bottom half of this drawing...
