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Engine | R-2800 Overhaul Manual

Auxilliary Supercharger Section
Supercharger Section
Power Section
Front Section
Supercharge Inlet
R-2800 Overhaul Manual Illustrations

Supercharger Section, Carburetor and Fuel Feed Guide, and Propellers

Supercharger Case | Main Impeller Drive Support Plate | Main Impeller Assembly | Carburetor and Fuel Feed Guide | Propellers



Supercharger Case  

The supercharger case is attached to the crankshaft rear section by studs, washers, and nuts. This case supports the engine in the airplane through six integral steel lined, angular bosses which accommodate six engine mounting flexible bracket assemblies (Fig 2-16). Nine outlet ports are located around the periphery of the case, and the "y" shaped cylinder intake pipes attach to these ports. The center wall of this case is bowl shaped and forms an annulus under the outlet ports. The front face of the center wall supports the shafts for the main impeller intermediate spring drive gears, and a steel liner is pressed into the center to accommodate the four main impeller front oil seal rings. The main impeller diffuser is supported on studs which project from the rear face of the center wall. 

Main Impeller Drive Support Plate:  The support plate attaches to studs on a shoulder in the front recess of the supercharger case (Fig 2-16). Four steel bushings in this plate support the front ends of the two main impeller spring drive gear shafts and the two dummy shafts anchored in the supercharger case. A fifth steel bushing in the front face of the plate supports the rear en of the rear secondary counterweight intermediate drive gear shaft. A steel backed bearing, in the center of the plate, supports the main accessory splined drive sleeve. The front of this sleeve mates with the internal spline in the rear of the crankshaft, and the main impeller spring drive gear locks onto the external spline at the rear of the sleeve. An internal spline in the center of the sleeve accommodates the front end of the accessory drive shaft.

Main Impeller Assembly:  The main impeller assembly is housed between the supercharger and supercharger inlet cases. The main impeller shaft is of hollow steel with two bronze bearings pinned in the I.D. These bearings support the assembly on the accessory drive shaft. Splines for the main impeller and the impeller drive gear, as well as lands for the four front oil seal rings, are machined on the O.D. of the shaft. The main impeller drive gear is locked onto the front spline and the main impeller, fuel slinger, rear oil seal ring carrier, and the two locknuts are installed on the rear of the shaft. Power is supplied from the crankshaft through the main accessory splined drive sleeve, the main impeller spring drive gear, and the two main impeller intermediate spring drive gears to the main impeller drive gear.

Carburetor and Fuel Feed Guide

These engines are equipped with an injection type carburetor which meters fuel in proportion to the mass air flow to the engine. The mass air flow to the engine is determined by the throttle opening. After being metered by the carburetor, the fuel is carried through the fuel transfer tube to the fuel valve in the supercharger inlet case. The fuel feed valve opening is controlled by boost venturi suction from the carburetor acting on the outboard side of the fuel feed valve diaphragm through a small bleed to the carburetor and by metered fuel pressure from the carburetor acting on the inboard side of the diaphragm. A spring on the outboard side of the diaphragm acts to oppose these forces and holds the valve on its seat until the metered fuel pressure is 3 to 5 pounds per square inch. The fuel is discharged from the fuel feed valve at the supercharger throat, where it is mixed with the air and vaporized by the impeller, passed through the diffuser to the supercharger rim, and then distributed to the cylinders through the intake pipes and inlet valves.


Oil is supplied to the central tube in the propeller shaft from the crankshaft and to the interior of the propeller shaft from the governor to operate a hydromatic propeller. In the model R-2800-42W engine, engine high pressure oil is boosted by a double acting governor an then transmitted through the two oil transfer tubes and the oil transfer bearing into the propeller shaft, where it is carried forward to the inboard and outboard sides of the propeller piston to operate a hydromatic propeller. By the addition of special propeller control parts at the thrust bearing cover plate, the engines may be readily adapted for the use of electrically operated propellers.

Up ] Auxilliary Supercharger Section ] [ Supercharger Section ] Power Section ] Front Section ] Supercharge Inlet ] R-2800 Overhaul Manual Illustrations ]


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Last modified: September 18, 2012

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