compression ratios?

["John Hertzman" <johnhertzman@domain.elided>]

In AD8-0470 James Tyson writes "I would like to add that euro versions of the
115 series cars came with 10.4 compression pistons vs. 9.0 pistons in the US
versions." In AD8-0471 Chris Sweetapple responded "I don't think this is true.
As far as I know, the only model with a 10.4:1 compression ratio as standard
was the 2000A Berlina, the one with automatic transmission." In AD8-0472 Les
Singh added "Chris is correct. There is often some confusion because 1750s
came with 10+ cr whereas 2000s were lower."

Whoops. What 1750, please? Nothing I have seen with a putative Alfa source -
Alfa sales literature, new product announcements, Fusi, d'Amico & Tabucchi,
other well-connected authors - has listed, for an Alfa I-4 (or "Nord") engine
a compression ratio over 9.7:1 prior to the 10:1 of the injected version of
the 90. The 9.7:1 is given by Fusi for the Sprint Zagato, Sprint Speciale,
1600 Spider Veloce, Giulia T.I.Super, TZ, and GTA, and 9.1:1 for the Giulietta
Veloce, but all of the more production 105/115/116 1300, 1600, 1750/1800, and
2000 carbureted or Spica-injected fours are listed at 9:1 in the sources I
have available (which do not include the 2000A). Fusi lists 10:1 for the 33
Stradale, which is contemporary with the 1750 but in a notably higher state of
tune, and 9.3:1 for the Montreal, which is contemporary with the 2000, but
"10+ cr" for the 1750 is beyond what I find as the usually cited range.
Doublecheck?

Cordially,

John H.

Raleigh, N.C.

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