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On 12 Jan 99, at 22:26, Steven Ayres wrote: > Since we're in the area, I've often wondered: why do the crankcase > vent gases and gunk go into the air cleaner and tops of the carbs rather > than directly into the manifold? Wouldn't the carbs stay a lot cleaner > that way? If they went directly into the manifold, they would not get mixed with any gas and the resulting mixture would probably be too lean. There's a pretty good vacuum downstream of the throttle plates when they're closed, so this would really suck on the case and would probably suck air/dirt in through the rear around the tail of the crank. Note that 72-3 type 3 FI engines actually DO this, but there is a rather small aperture to limit the airflow and clean air is supplied from the air cleaner to each head to allow for this. Jim - ****************eFÜG ******* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/