Quote:
Originally Posted by dmjlambert
I would like to know what each vacuum port is supposed to be used for, and know what size hose to use on each port. Is there an illustrated guide I can buy for that or good place to go on the Internet? I think the hoses may have been hooked up any-which-way with whatever hose may have been laying around. The heat stove was removed from the exhaust manifold during rebuild and the vacuum switch to choose air from the air intake tube or from the hot air pipe is not connected. I'm not sure what is the proper thing to do with that.
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Pretty simple, others can correct me just in case:
Most Q-Jets have a big port on the back at the base for power brakes.
Most Q-Jets have two ports on the front, they are:
- The one ABOVE the baseplate is ported vacuum advance for the distributor
- The one BELOW the baseplate is manifold vacuum (heat stove valve, etc)
Anything on the carb below the throttle plates, or connected to the actual intake manifold (like a brake pipe fitting) are manifold vacuum. Only that ported one above the throttle blades, for the distributor, is in any way "special".
That's about it.