barfy Posted July 12, 2011 Report Share Posted July 12, 2011 I Quote Link to comment Share on other sites More sharing options...
rockyrider Posted July 12, 2011 Report Share Posted July 12, 2011 That would sound like twice the clearance needed. i.e., 1mm=.039" Quote Link to comment Share on other sites More sharing options...
dombush Posted July 12, 2011 Report Share Posted July 12, 2011 Hi Barfy your suspicion would be correct... i would expect the clearance to be somewhere between .002" and .004"maximum depending on design etc. Converting that to metric, thats .05mm to 0.1mm max. All things considered, the piston to bore clearance 0.58mm is unusable. just checking, are you measuring the piston skirt below and at right angle to the gudgeon pin? Dom Quote Link to comment Share on other sites More sharing options...
fantic303 Posted July 12, 2011 Report Share Posted July 12, 2011 I have done the rebore with a clearence of 0,02 -0,03 mm. Quote Link to comment Share on other sites More sharing options...
barfy Posted July 12, 2011 Author Report Share Posted July 12, 2011 Hi Barfy your suspicion would be correct... i would expect the clearance to be somewhere between .002" and .004"maximum depending on design etc. Converting that to metric, thats .05mm to 0.1mm max. All things considered, the piston to bore clearance 0.58mm is unusable. just checking, are you measuring the piston skirt below and at right angle to the gudgeon pin? Dom Thanks Dom and all, Panic over. Using my callipers the piston is about the same measurement on the skirt below and at right angle to the gudgeon pin. The top of the piston seems to Quote Link to comment Share on other sites More sharing options...
dan williams Posted July 12, 2011 Report Share Posted July 12, 2011 The top of the piston expands more then the skirt when hot. Quote Link to comment Share on other sites More sharing options...
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