|
The vacuum guage serves mostly as a load indicator.
I always installed a vacuum gauge in all my carburetor equipped vehicles. It was most effective in our big 78' Dodge van with a 360 cubic inch V8 and a large spread bore ThermoQuad carburetor.
By fooling with various springs, we could delay the opening of the huge vacuum secondaries and drive around mostly with the tiny primaries. Only when the vacuum gauge hit a set reading would the secondaries open. A piece of tape indicated this point on the dial. It was great fun to putter around trying to keep out of the secondaries. The 8000 pound van was capable of 8-10 MPG factory. Just putting in the vacuum gauge and carburetor springs jumped us up to 12-14 MPG.
|