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How to calculate the compression / motor compression 4tak

How to calculate the compression of a motorcycle. usually of a new motorcycle brochure've listed how the compression of the motor. as samples motors yamaha jupiter has 1:9.4 compression. how to look for it. formula as follows:

     VB + VC
     VB

     VC = volume of the cylinder

     VB = volume of the combustion chamber

jupiter sample cylinder has a volume of 115 CC. and has a volume of 13.85 CC combustion chamber obtained by using a burette to fill the combustion chamber through the spark plug hole with fluid at the position of the piston is at TDC (top dead center) can also use the injection the doctor who has the size cc. when dihitunng:

     115 + 13.85
     13.85
     = 9.3333

means the compression ratio of the engine jupiter default is 1: 9.3

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