Posted by Dean on September 10, 2013 at 20:25:04 from (152.216.3.5):
In Reply to: Re: Detroit Diesels posted by Scott in SF on September 10, 2013 at 19:25:30:
Correct.
The mechanically driven roots blower charges the cylinder when the piston opens the ports. The pressureized charge air also scavanges the cylinder of exhaust gasses when the exhaust valves open. The engine would not run without the blower.
Unlike small two cycle engines, out board motors, etc., that use premixed fuel (lubricating oil in fuel), the Detroits have a crankcase and pressure lubrication so it is not possible to charge the cylinder through transfer ports from pressureized fuel/air mixture in the crankcase.
As with other engines, adding a turbo increases boost at higher RPM, which, in conjunction with increased fuel, increases power at higher RPM.
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