Quote:
Originally Posted by Old Mechanic
When you have a manifold reading of 14 inches, you are only allowing the remaining inches of measured air into the cylinders, so to say that the same amount of air always passes through and engine is incorrect. You can confirm this by just considering the exhaust exiting the tailpipe. At idle it is a very small amount, Rev the engine up and the amount vastly increases.
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There is a significant flaw in this statement, RPM increases exhaust volume significantly.
But I have also been looking at this >
Vacuum and Flow Measurement
And I have more questions than answers.... I was under the impression that real air consumption 'actual volume flow' would go up as vacuum was decreased, towards positive pressure... but now I'm just confusing myself.
