Any guesses what this is?
It's a Pratt and Whitney WASP 4360. See description from Wikipedia below.
Pratt & Whitney R-4360
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Pratt & Whitney R-4360 Wasp Major (sectioned)
Pratt & Whitney R-4360 Wasp MajorThe Pratt & Whitney R-4360 Wasp Major was a large radial piston aircraft engine designed and built during World War II. It was the last of the Pratt & Whitney Wasp family and the culmination of its maker's piston engine technology, but the war was over before it could power airplanes into combat. It did, however, power the last generation of large piston-engined planes before the jet engine and turboprop took over.
It was a 28 cylinder four-row radial engine with each row slightly offset from the previous, forming a semi-helical arrangement (as can be seen in the photograph), to facilitate cooling of the successive rows of cylinders. A mechanical supercharger geared at 6.374:1 ratio to engine speed provided forced induction, while the propeller was geared at 0.375:1 so that the tips did not reach inefficient supersonic speeds.
Although reliable in flight, the Wasp Major was maintenance intensive. Improper starting technique could foul all 56 spark plugs, which would require hours to clean or replace. As with most piston aircraft engines of the era, the time between overhauls of the Wasp Major was about 600 hours when used in commercial service.
Engine displacement was 4,362.50 in? (71.5 L), hence the model designation. Initial models developed 3,000 hp (2240 kW), but the final models delivered 4,300 hp (3200 kW) using two large turbochargers in addition to the supercharger. Engines weighed 3,482 to 3,870 lb (1,579 to 1,755 kg), heavy but giving a power to weight ratio of 1.11 hp/lb (1.83 kW/kg), matched by very few engines.
