[ihc] questions about older motor designations

[Colin MM Rush <salmineo@xxxxxxxx>]

In my research on the M-5, I have been reading about the older motors IHC
made.  I am hoping some of the IHC cognoscenti can give me some insight
into the letter designations of the older engines.  I understand what RD,
SD, GRD, BD, BG, SV, MV, and LV means.  Does anyone know what FAB, FAC,
FBB, FBC, HD, and FC mean?  I have a little figured out; such as FBB and
FBC:  the second letter refers to the engine size/type, while the last
letter indicates the design, sort of.  For example, the FBC was the newer
design of the FBB, and the RD became the newer design of the FBC.  I do
not know if there was ever an FBA.  The FAB and FAC motors were similar: 
The FAB was an older version of the the FAC, and the FAC was an older
version of the BD.  Again, I do not know if there was ever an FAA motor. 
But what does the F stand for?  Does the B or A in the middle actually
stand for anything?  And I am totally clueless when talking about the FC
and HD.  What do they mean?

FYI, those of you that are into those  older motors may be interested in
a book that I just got from a bookstore that reprints copies of the
Thompson Repair and Tune-Up guide.  It has everything about the motors
used by IHC between 1935 and 1940, with tune up specs, oil flow diagrams.
belt and carb adjustment directions, drawings, and so on.  If anyone is
interested in it, let me know, and I will tell you how to get it.  
-Colin Rush

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