vairjer at comcast.net vairjer at comcast.net
Thu Jul 29 17:36:52 EDT 2010

Regarding the rotating weight of the rotor of a 10 DN or 10SI Delcotron, the formed steel fingers/shell around the wound copper core and the steel shaft provide most of the weight and are identical INSFAIK. The windings in the copper coil did vary to provide differing numbers of turns and resistance. The stator (stationary winding) varied the the number of turns from one output version to another. I wouldn't sweat the rotor weight as they are basically all the same in the same size frame, except for a few ounces of copper. The 15SI is another matter.....I am not sure about the 12 SI... 

Jerry McKenzie 
Delco Remy QC test engineer in a previous life 

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