addenda on final drive gear ratios

[JHertzman@domain.elided]

In AD7-640 Godfrey DiGiorgi, responding to a question "For US spec 105, 115 
models, does someone know what years had 4.56 and which years had 4.11? 
writes " According to the best info I can find, all US delivery 105/115 
Spiders from '69 to '81 (1750 and 2000 engines) had the 4.56:1 gearing, and 
all '82 and later cars had 4.11:1 gearing. The changeover point seems to have 
been the introduction of the Bosch L-Jet engine in '82"

One added data point, a 1980 Road & Track test for their "Sports & GT Cars" 
annual (reprinted in The Brooklands Books Spider Gold Portfolio) gives the 
rear end ratio as 4.10 and in the text links this to the introduction of the 
single butterfly induction, breakerless ignition, variable valve timing last 
iteration of the Spica engine.

Godfrey states further "Some of the european road tests in my Spider road 
test collections seem to indicate that the standard european delivery cars 
were fitted with the taller rear, but it's not entirely clear whether the 
1750s were or whether it was only the 2000s."

A "Motor" (British) road test of the 1750, May 24 1969 reprinted in the 
non-gold (silver?) Brooklands Spider compilation gives the final drive ratio 
as 4.1-1. A 1750 GT Veloce test by John Bolster in "Autosport", August 16 
1968 (in Brooklands' Giulia Coupes) also gives 4.1-1, as does a 1750 GT 
Veloce test by "Motor", incorrectly dated in the table of contents (and 
sequenced in the book) as July 1966 but apparently 1968. "Autocar" in 
September '68 gave the same 4.1 for the 1750 GT Veloce.

Cordially, 

John H. 
Raleigh, N.C.

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