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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

Description of the Supercharger Inlet, Ignition System, and Combat Power

Supercharger Inlet | Ignition System | Combat Power




Supercharger Inlet Case  

This case attaches to the studs in the rear of the supercharger case (Fig 2-17). It incorporates air inlet passages for both the main and auxiliary impellers. One inlet passage incorporating a rectangular mounting flange for the carburetor, conducts air to the front of the case for the main impeller and two smaller passages, having rectangular ports, conduct the air to the rear of the case for the auxiliary impeller. Two butterfly valves on a single shaft, one in each auxiliary inlet passage, are connected by linkage to the auxiliary supercharger regulator which automatically controls the opening of these valves so that a constant air pressure is maintained at the carburetor entrance. An insert is fitted into the front face of the supercharger inlet case and forms the throat for the main impeller air passage. A steel fuel nozzle is pressed into the center web of this insert, and a drilled passage, running from the outside o the case through the web of the insert to this fuel nozzle, houses the fuel feed valve. In the R-2800-42W engine, internal fuel and water passages are provided for use with a variable water regulator, mounted on the left side of the case. The bottom of two drilled passages, at the top and bottom of the case, accommodates the fuel drain valve, whereas the top passage is plugged. A steel liner, pinned in the center bore of the case, accommodates the front and rear oil seal rings for the auxiliary and main impeller shafts, respectively, and incorporates a steel backed bronze center bearing which supports the accessory drive shaft (Fig 2-17). A mounting pad for the supercharger regulator is located at the center of the right side of the supercharger inlet cast.

Ignition System

Ignition is furnished by a dual magneto and two distributors separately mounted on the front accessory housing. The magneto has two breakers, each of which controls current to one distributor. The left distributor supplies current to the rear sparkplugs in all cylinders, and the right distributor supplies current to the front sparkplugs in all cylinders. The two distributors and the ignition cable assembly, which is of the cast filled types, form a completely shielded unit to carry the current to the sparkplugs. Each distributor incorporates an air pump and is provided with a steel tubing system to pressurize the magneto and the distributors.

Combat Power

Combat power is obtained by means of a water injection system developed to permit the engines to be operated safely on currently prescribed military fuels at powers higher than the present military power ratings. This extra power is gained by leaning the fuel-air mixture to best power mixture strength and by operating at a higher manifold pressure. To prevent detonation, water is injected to cool the intake cage from the engine supercharger and to retard the speed of the flame travel in the combustion chamber. When water injection is applied, the Air Force and Navy have approved a higher power rating called Combat Power, and it is assumed that this rating will be used only as required in combat emergency for attack or evasive action. The model R-2800-42W engines are equipped with a variable water regulator unit which includes a non-hesitating feature to permit operation at powers considerably below normal rated power.

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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