Carb vacuum port ID
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==='''ROCHESTER Q-JET'''=== | ==='''ROCHESTER Q-JET'''=== | ||
| + | (Other carbs to follow) | ||
You will want to be able to identify a '''ported''' vacuum source from a '''manifold''' vacuum source. A ported vacuum source will be either absent or nearly so at idle, and will register vacuum only when the throttle blades are opened. A manifold vacuum source will be there all the time- at idle and when the throttle blades are opened. Then decide- either by prior knowledge or by trial and retrial- which type of vacuum (ported or manifold) you want to use for the distributor vacuum advance. | You will want to be able to identify a '''ported''' vacuum source from a '''manifold''' vacuum source. A ported vacuum source will be either absent or nearly so at idle, and will register vacuum only when the throttle blades are opened. A manifold vacuum source will be there all the time- at idle and when the throttle blades are opened. Then decide- either by prior knowledge or by trial and retrial- which type of vacuum (ported or manifold) you want to use for the distributor vacuum advance. | ||
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