You will also reduce the CFM or flow of air into the cabin using a power
The heat is created through a transfer of heat coming from the exhaust in
the heat exchangers. If you get the exhaust hotter then the heat coming
into the cabin should be hotter too.
IF you can find the original (HEAVY) type of heat exchangers, use a stock
muffler, make sure the engine is not running too rich, make sure the cabin
is pretty air tight, you should find that the heat can be very warm to hot.
I have run several Beetles here in Chicago and my '66 with a 1600 engine
could literally cook my left shoe at the heat outlet in the front.
Now remember that a good heater produces a lot of fogging of the glass when
there is moisture in the air when the heat is kicking! Opening up a window
a little helps reduce the fogging but then makes things cooler.
So I vote NO to the power pulley! ;-)
Once upon a time there was a kit with ducting, hoses, switches, wiring and
electric fans that would recycle the air from the cabin to the heat
exchangers I believe bypassing the main engine fan. That should make the
air hotter, a little drier and the flow would be more constant too.
(One out of many daves)
Click to see the full signature.