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to FAQ. First published 2 November
1999
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Alfa Romeo Spider Frequently
Asked Questions. FAQ!
1300 Spider Junior
The electric system,
engine and transmission
Compared to the 1750, the 1300 Junior’s
alternator was rated at a lower 300 Watts, the same power as
that on the Duetto, but this were the only difference.
The 1300 engine was shorter in both stroke
and bore than either the 1600 or 1750 engines, and with only a
millimetre separating the bore and stroke, it was virtually an
all-square unit. Dubbed type number 00530, it was effectively
the same engine that was fitted to the old 101-series
Giulietta Spider, and the same as the GT Junior’s.
This engine had different specification
carburettors again: twin Weber 40 DCOE 28 specification, or
Dell’Orto DHLA40, or Solex C40 DDH-4, all of them twin-choke
carbs. There was also a different choice of air cleaner/filter.
Unlike the 1750 engine, which had a higher 9.7-litre coolant
capacity, the 1300 engine retained the Duetto’s 7.5-litre
capacity system.
With a 9.0:1 compression ratio, the engine
developed 89bhp at 6000rpm (according to the measuring system,
other sources also quote 87bhp or 88bhp). Its maximum torque
output was 101lb ft at 3200rpm (other sources quote 102lb ft
at 3000rpm).
In broad terms the Junior duplicated the
transmission layout of the larger-engine Spider. However the
top (fifth) gear ratio was slightly shorter than that on the
Duetto and 1750 Spider Veloce, at 0.860 rather than 0.790,
echoing the gear-set of the GT Junior coupe. It also had the
lower Duetto-type 4.555:1 final drive in effort to maintain
acceleration. For reasons of parts standardisation, the same
new-type single-plate hydraulic clutch as the 1750 Veloce was
fitted.
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