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Piston length-diameter ratio

Piston length-diameter ratio

Piston length-diameter ratio

(OP)
Could you help in finding an analytical answer or formulas for a proper length-diameter ratio of a piston to prevent it from binding as a function of force or pressure, and piston diameter, and the clearance between the piston and cylinder bore?  The piston can either be connected to a rod or to nothing.  Thanks very much in advance.    

RE: Piston length-diameter ratio

As in a nonguided reciprocating engine piston? Or something similar to a hydraulic cylinder piston? Two very different loadings.

RE: Piston length-diameter ratio

(OP)
It is something similar to a hydraulic cylinder piston.  Sorry for not making my question clear.  Please help.

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