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Re: Dumb Question of the day!!
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Posted by F14 on March 05, 2001 at 04:53:19 from (216.252.28.188):
In Reply to: Dumb Question of the day!! posted by TJ on March 05, 2001 at 04:33:50:
"naturally aspirated" means there is no mechanical device, such as a turbo or supercharger, to increase intake manifold pressure. On a NA engine, the fuel charge is drawn in by the vacuum created when the pistons are on the down stroke, and the entire intake tract is under a vacuum, usually 17-20 inches of mercury at idle. A turbo or supercharged engine puts the intake under positive pressure (8-10 PSI on a street engine at full boost) which crams more air into the cylinder, increasing power.
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