Installation manual

1-59

90-898305

Air Compressor System

Air from inside the engine cowl is drawn into the compressor through the

flywheel cover or air plenum. This cover acts like a muffler to quiet

compressor noise and contains a filter to prevent the ingestion of debris into

the compressor.

A restrictor is located between the filter and compressor. The restrictor design

lowers the compressor intake noise and should be removed at altitudes above

5000 feet (1997 models)

The compressor is driven by a serpentine belt from a pulley mounted on the

crankshaft, and is automatically self adjusted using a single idler pulley. This

air compressor is a single cylinder unit containing a connecting rod, piston,

rings, bearings, reed valves, and a crankshaft. The compressor is water

cooled to lower the temperature of the air charge and is lubricated by oil from

the engine oil pump assembly.

As the compressor piston moves downward inside the cylinder, air is pulled

through the filter, reed valves and into the cylinder. After the compressor

piston changes direction, the intake reeds close and the exhaust reeds open

allowing compressed air into the hose leading to the air/fuel rails. An orifice is

installed in the line between the compressor and air rail to smooth the pulses

transmitted from the compressor to the air rail.

The air/fuel rails contain two passages; one for fuel, the second is the air

passage. The air passage is common between all the cylinders included in the

rail. A hose connects the starboard rail air passage to the air compressor.

Another hose connects the starboard air rail passage to the port air rail

passage.

An air pressure regulator limits the amount of pressure developed inside the

air passages to approximately 80 psi. Air exiting the pressure regulator is

returned into the exhaust adaptor (intake plenum 2000 3.0L) and exits thru the

propeller.

Notes

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