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Message: [QUOTE="superpsd, post: 1341155, member: 15821"] As far as having a turbo blow into a blower. It's has been done. For example a Detroit 2 stroke. I own a few of the green beasts. They have a roots blower and will not run without one. They are Naturally Aspirated as the blower is only scavenging the cylinders by pushing out the exhaust and replacing it with fresh air charge. So there is no positive pressure due to the port to valve timing events. Some are turbocharged by feeding a turbo into a blower. These do create boost not because of the turbo itself but due to the exhaust back pressure of the turbine allowing positive pressure to build. In the 80s Detroit Diesel improved the 2 strokes and released the Silver Series. The silver's had many improvement sto reduce sound and effeciency one of which was a blower bypass so once the turbo was flowing air to a certain pressure ratio it forced a spring loaded bypass to even the pressure differential of the roots blower. This reduced the load on the blower and improved effeciency. So you see even if I had a turbo feeding a blower...Once the turbo is lit you would want a bypass to route around the blower to maintain effeciency and unload the blower. Also to note a the blower on a NA 2 stroke is geared to turn faster than a turbo Model blower. You can see the bypass in the end of the blower below. [ATTACH=full]161743[/ATTACH] [/QUOTE]

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