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Ideally, the venting tube should be located on the outside of the filter so any gases/fumes/particulates/gunk get filtered before getting sucked into the combustion chamber. Now, if you have a non-stock set up (carbed, like me) and you would rather have the crankcase gases get recycled rather than spewed to the ground the only place to do this is by tapping into the top of the carb cover. Trying to drill a hole into the manifold and tap a thread is too risky for a novice (plus all the disassembly required just to remove it) and, more importantly, using the manifold isn't safe due to the fuel mixture rushing through it. A backfire could travel into the engine case (think about the unfortunate fellow who has gas in their oil...)and the pressure that is vented varies and can really screw up the fuel metering which is why it's best to have it go through like the rest of the air and given the proper amount of fuel for the air entering. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member '95 VW Jetta GL 2.0L, boringly bone-stock Portland, Oregon, http://www.pobox.com/~toby_erkson/ -----Original Message----- 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? ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe