Posted by Popinjohn on September 23, 2012 at 17:51:44 from (24.168.43.43):
In Reply to: Re: 53 series Detroit posted by bob7337 on September 23, 2012 at 16:32:27:
Naturally aspirated refers to the action of atmospheric pressure filling the cylinder of a four cycle engine when the piston moves to the bottom of the cylinder on the intake stroke causing a low pressure situation in the cylinder. People refer to this as vacuum, but it really isn't, it's simply pressure lower than atmospheric, 14.7 psi. This doesn't happen on a Detroit two-cycle because when the piston reaches the bottom both the ports in the bottom of the cylinder and the exhaust valves are open at the same time. A blower is required, not to pressurize the cylinder like a turbo charger does, but is required to scavenge the spent exhaust gases from the cylinder and introduce fresh air for the next combustion event. Without a blower, atmospheric pressure in the air box and the exhaust manifold remain the same at 14.7, so no cylinder filling can occur. In other words, a Detroit won't run without a blower supplying pressure to the air box. For lack of better wording, Detroit simply designates the two-cycle engines as NA (naturally aspirated).
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