| Asso XI | |
|---|---|
 | |
| Type | V-12 water-cooled piston aircraft engine |
| National origin | Italy |
| Manufacturer | Isotta Fraschini, Milan |
| First run | early 1930s |
| Major applications | CANT Z.501, CANT Z.1007 |
The Asso XI was a family of water-cooled, supercharged V12 piston aeroengines produced in the 1930s by Italian manufacturer Isotta Fraschini, and fitted on a number of aircraft types built by CANT, Caproni and others.
Isotta Fraschini produced a long series of engines with the name Asso (Ace, in English). The Asso XI R.C. was an upright, liquid-cooled V-12 engine with maximum power output in the range 670–725 kW (898–972 hp) depending on the degree of supercharging. There were two variants, differing only in their supercharger speed: the R.C.40 ran at a little over 10 times the crankshaft speed and enabled the engine to maintain a rated power of 623 kW (835 hp) to an altitude of 4,000 m (13,000 ft) whereas the R.2C.15 held 655 kW (878 hp) to 1,500 m (4,900 ft) with a supercharger gearing of 7. [1]
All variants of the R.C.40 had much in common with construction of the earlier Asso 750 R.C., though they had two, rather than three, banks of 6 cylinders and 4 rather than 2 valves per cylinder. Cylinder barrels were machined from carbon steel with flat-topped heads and valve seats. Each barrel had a separate sheet steel water jacket. Cast aluminium head blocks were bolted to each of the two banks of 6 cylinders, providing valve ports, guides, coolant passages and camshaft supports. The pistons were also aluminium castings. The crankshaft was a 6-throw design with 8 plain bearings and a double row ball thrust bearing between the front two. The connecting rods had bronze bush little ends and white metal big ends. The crankcase was cast in two parts, the upper one with the housings for the crankshaft bearings. [1]
Data fromJane's All the World's Aircraft 1938 [1]
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