Wright R-2600-35

Although the PB4Y was originally fitted with P&W R-1830s, the LSFM's PB4Y was fitted with Wright R-2600-35s to perform its aerial firefighting mission.

Wright R-3350 Turbo Compound

Three Power Recovery Turbines (PRT), one of which is at the extreme left, provided nearly 600 hp at takeoff

Wright R-3350 Turbo Compound

PRT Detail

Wright R-3350 Turbo Compound

PRT (lower left) drives crankshaft through bevel gears and fluid coupling. Also seen are drive trains for the cam ring and secondary counterbalances.

Wright R-3350 Turbo Compound

Crankshaft detail showing center main bearing, connecting rods and clamp joint

Wright R-3350 Turbo Compound

Detail of cylinder head, intake valve and valve train

Pratt & Whitney R-4360

Cutaway

Pratt & Whitney R-4360

Nose case showing propeller reduction gear, front accessory drives and cam drives

Pratt & Whitney R-4360

Rear view showing carburetion, supercharger and rear accessory drives

Pratt & Whitney R-4360

View along a bank of cylinders showing intake tube and low-tension ignition

Pratt & Whitney R-4360

View of master rod, dynamic vibration absorber, cam rings and drives

Pratt & Whitney R-4360

Another view of connecting rods

Pratt & Whitney R-4360

Low-tension magneto cutaway

Pratt & Whitney R-4360

Another view of the nose case and propeller reduction gear

Pratt & Whitney R-4360

Detail of cylinder head, valves and induction passage