Quote:
Originally Posted by dmac
Vacuum is what sucks gas into your engine. Poor vacuum doesn't allow the engine to fully atomize the fuel and distribute it evenly as well. Low vacuum also slows the airflow. Unless you plan to run only at higher rpm all the time, too low a vacuum isn't going to be as driveable for a street car.
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What is considered low?
Take two 462ci engines one idles with 14" and the other 10", I know the idle will be slightly rougher (most likely anyway) on the engine with 10" of vacuum vs the 14" of vacuum but besides that what else? Once the engine gets off idle you'll never know there was a difference.