This question was raied by working on my brther' Dodge 2.2 turbo, but lingers in mind non-the-less and I thought maybe one of you bright guys out here would have an enlightne opinion. On his engie, the are four vacuum lines that all goto the same general area of the engine compartment. Why didn't Mopar run just one line, and then put a series of "t"s in the line. Would this approach have changed they way the vacuum signal would change, and thus hinder the reponse time of the device being regulated. AND, does the size of the vacuum line effect the way the signl reponds? I thought maybe a largeline would act somewhat as a vacuum resevoir and keep the signalfrom fluctuating enough. I also thought the multimple tubes was to keep the various devices from effecting each other. In the case of the 2.2 turbo, he lines in question o to a series of vacuum solenoids. These are switches that shut off or open the vacuum source to another accessory. For instance, one of them controls the turbo waste gate, and another controls the, EGR valve. Apparently the computer can over-ride thevacuum signal, and cut it off at times., suchas when the enine is cold for instance.
I do't know how prctical this topic seems, but sometimes theortical threads can lead to some interesting thought povoking discussion.
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