bumping clearance is the clearance between piston and head ,piston and crank endside
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Drumming, Bumping, Pushing
In the context of a compressor, "cc" typically refers to the displacement volume of the compressor's cylinders, measured in cubic centimeters (cc). This value represents the total volume swept by the piston in the compressor during one complete cycle. It is a crucial factor in determining the compressor's capacity and efficiency, as a higher cc value generally indicates a larger compressor with greater output potential.
My paper work/owners manual states 1969
Efficiency is nothing but calculating how the machine is performing for what it has been made for, Efficiency is usually calculated in % as (output/input )X100. for Eg. the Thermal efficiency of an reciprocating gasoline engine can be calculated as follows, Let, the input for an reciprocating engine is 12MJ and its out put is 4MJ then Efficiency is (4/12)X100 = 33%
The approximate loaded speed of a 3600 RPM compressor is between 2500 and 3000 RPM. Because the load puts additional strain on the motor, it reduces its rotational speed.