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I don't think you can just slap a blower onto a diesel engine; there are many parts that would need to be specific to a diesel running a blower to accommodate it. The clearance in the piston wall might not be correct; the size of the rod journals and main bearings may need to be larger; the injection pump may need modification and it's timing may need adjustment to provide the correct amount of fuel and prevent pre-combustion. The exhaust valves and manifold may need to be larger. The base compression ratio would need to be lower so you don't end up with too high of a CR once the blower is installed. These are the things I can think of off the top of my head; not saying that they all would need to be done but certainly it would be a big project that might only yield 20-30% more HP.
I don't think you would improve efficiency; most turbo/blower applications tend to decrease efficiency to achieve more HP in the same size engine.
JMHO...
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