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Ski-Doo SDI-a quite different and more economical route to low two-stroke emissions and fuel consumption. SDI stands for Semi-Direct Injection, and it describes a system by which fuel is injected, not into the combustion chamber, but into the fast-moving air streams in the rear transfer ports.DI stands for serial digital interference. It is a video interface used within broadcast environments and supports both SD and HD signals. It runs on a single co-ax cable wit â¦ h BNC terminations.
The Strategic Defense Initiative (SDI) was proposed by U.S.  President Ronald Reagan on March 23, 1983 to use ground and  space-based systems to protect the United States frâ¦om attack by  strategic nuclear ballistic missiles. It turned out to be a good  idea, since it spawned research for offshoots of the concept.