carbs popping, and bonus clutch question Options

[vitaminC]

In my quest to drive every 914 I can, yesterday I drove a 73 1.7 that has recently been refitted with a 2056 with Weber 40's. The car started and idled fine, and overall drove quite nice. However, when I was on the freeway there was some popping happening in the carbs. It seemed to occur more at a steady throttle vs accel or decel. Any thoughts what might cause that?

And on an unrelated topic, where is the 'typical' clutch engagement point? The '73 seemed okay, but the '71 I drove earlier engaged right at the top of the travel (i.e., I hardly needed to push the pedal) and that didn't seem quite right.

Thanks.

[rhodyguy]

LOUD snapping or light sneezing? at 60ish on the fw your right in the transition between main and idle circuitry and the series of progression ports. the sneezing may be solved (low speed, but with the throttle plates not above progression ports) with the air by-pass on the offending barrel. the idle/air mixture screws are just that. they allow more FUEL to be drawn in when the throttle plates are CLOSED. once the throttle plates start to raise above the prog ports the draw on the idle air mixture screws lessens and fuel is drawn directly into interior carb wall. the ports are drilled into the well that feeds the iams.

with the tops off of the filters you can usually note the the offending barrel when you increase the engine speed by hand with the linkage. listen and watch from aside. with a sneeze you may see a momentary puff of atomized fuel or a flame with a bang. DON'T BE LOOKING DOWN THE BARRELS during your observations.

k