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Engine basics => Engine set up tips => Topic started by: frank mccune on April 28, 2015, 09:23:07 AM

Title: How tightly should a cylinder fit into a crankcase?
Post by: frank mccune on April 28, 2015, 09:23:07 AM

     Hi:

     I just assembled a Fox .35 Stunt from assorted parts and I find that the cylinder is a shrink fit in the crankcase.  The piston is a very tight fit in the cylinder.  I used a p&c that I new was  great fit into a new crankcase. I cleaned all of the burned on residue from the outside of the cylinder to aid fitting it to the case.  I left the burned on castor residue on the piston.  Perhaps I should remove the p&c and remove the castor residue from the piston.  I left it on to help form a good seal. Perhaps, it should be removed as he fit of the p&c is vey tight. I have been running the engine in a rich mode hoping that it would form a good p&c fit.

     Any suggestions?

                                                                                                              Tia,

                                                                                                              Frank McCune

Title: Re: How tightly should a cylinder fit into a crankcase?
Post by: RandySmith on April 28, 2015, 01:01:31 PM

None of the stunt 35s are a pressed fit, and all should be able to be installed with finger pressure, if it is tighter than that, look close to see why...

Randy

Title: Re: How tightly should a cylinder fit into a crankcase?
Post by: Chris Wilson on May 02, 2015, 05:36:42 PM

Possible muffler clamp distortion going on here.