Hello Brian, Thank you for the information. I now understand why the 009 stumbles. I enjoyed reading the articles and I now have a greater understanding of how the two types of advances differ in performance. Another plus is that I now know what is wrong with my Dad's 72 Super Beetle. He also has a 009 distributor. I do not understand why anyone would put the 009 on the car if it has so many problems. By what I read it is more of a step backwards in perfomance rather than enhancing performance. take care, Greg
Brian wrote: > Greg, > > The vacuum advance works to advance the ignition timing based on > engine load > (the more load (vacuum), the more ignition advance). The centrifical > advance > distributor (009) advances based on RPM. There are weights attached > that advance > the timing at increasing RPM. With the 009 you may notice flat spots > on acceleration > because the timing does not advance at low RPM. Here's a good > description of the > distributors: > > http://www.vw-resource.com/009_history.html > > There are a few of things you can easily check on a used vacuum > advance distributor > to determine it's condition. > 1) The lobes on the distributor shaft should not be too worn. > With the distributor cap removed, try to wiggle the distributor > shaft side to side; > there should be very little noticeable movement. > 2) With a hose attached to the vacuum canister, suck on the hose and > watch the advance > plate inside the distributor rotate (advance) slightly. > 3) There should be a small braided wire (ground) attached to the > advance plate on one end and a > nut on the other. The nut is held to the inside of the distributor > by a screw from the outside. > If you need a picture of this, let me know. > > Here's more good information regarding different distributors. > http://www.type2.com/~keen/ignition.html > > Brian _______________________________________________ vintagvw site list [email protected] http://lists.sjsu.edu/mailman/listinfo/vintagvw
