Second part:
This booklet is titled "Manuale d'uso", so it would loosely translate as "user manual". It contains both instruction on how to operate the engine and how to service it.
The date on the booklet is November 1943 although this seems to be a second edition of sort, the first print being dated August 1942
The first pages contain a detailed description of the engine specs and performance. Let's review them:
The A.82 is an 18 cylinders radial engine, with bore and stroke of 140 x 170 mm (5 mm longer than the A.80) for a total displacement of 47.1 liters. Weight including accessories is stated to be 870 Kg. On page 7 there is a detailed description, with weight, of the accessories. Their total weight is 46 Kg, so it follows that the net weight of the engine is 824 Kg.
The second half of page 5 and page 6 contains the detailed specs of the engine (power, rated altitude, manifold pressure [absolute, in mm Hg], specific fuel consumption). Here's a summary:
Max power at altitude: 1250 Hp - Alt: 4200 m - Rpm: 2300 - Manifold: 850 mm Hg - SFC: 280 gr/CVh
Max power at sea level: 1090 Hp - Alt: 0 m - Rpm 2300 - Manifold: 850 mm Hg - SFC: not stated
The A.82 engine still employs a single stage, single speed centrifugal supercharger spinning 8.6 times faster than the crankshaft.
Take off power (time limited): 1400 Hp - Alt: 0 m - Rpm 2400 - Manifold 1040 mm Hg - SFC: 330 gr/Cvh
It's interesting to note that there is a foot note regarding take off and military power: It says: "
Ottenuti usando combustibile normale con numero di ottano 87; usando invece combustibile B4 con numero di ottano 90 si può avere al decollo 1500CV" - Translated, it says: "Obtained using normal fuel with an octane number of 87; by using instead B4 fuel with octane number 90 it's possible to achieve 1500HP". This is interesting because it tells to us something about how the Italians measured Octane number. The Germans considered their B4 fuel to be 87 octanes; the Italians, instead, rated it 90 (though I've seen other Italian engines service manuals rating it even higher, at 91-92). Italian fuel was truly worse compared to what was available at the time to Germans and Japanese and, on top of that, it didn't contain a lot of antiknock addictive. The standard formulation was distilled gasoline + 0.08% in volume of Ethyl which was a mixture of TEL + Bromoethane. By contrast, in Italy in the '30s, there was already available a special gasoline for sports cars, called 'Dynamin', which was composed of 49% distilled gasoline, 30% Benzol (a distillate of coal tar rich in BTX aromatics), 20% anydrous alchool and 1% ricin oil. It's octane rating was 95-100 so, at least in theory, the Italians knew how to make a better fuel. Too bad they used it for sports cars and not for the war effort
The rest of the claimed specs are the following:
'Economic cruise' setting: 750 Hp - Alt: 5500 m - Rpm 2000 - Manifold : 575 mm Hg - SFC: 240 gr/Cvh
'Fast cruise' setting: 1100 Hp - Alt: 5500 m - Rpm 2300 - Manifold: 770 mm Hg - SFC: 260 gr/Cvh
'Emergency rating': 1400 Hp - Alt: 4000m - Rpm 2400 - Manifold: 1040 mm Hg - SFC: 330 gr/Cvh
Last, at the bottom of page 7, there are the valve and ignition timing:
Intake opens 9°48' before top dead center and closes 68°52' after bottom dead center
Exhaust opens 67° before bottom dead center and closes 21° after top dead center (a lot of overlap, it seems)
Ignition timing was fixed at 26° before top dead center
That's all for the moment. If anybody is interested in more info, drop a few lines here and I will answer the best I can. The manual is also full of interesting drawings of the engine and of its parts.