Hello All:

             Anybody have any ideas or suggestions as to how tightly the cylinder liner should fit the crankcase for the best performance?

                                                                          Tia,

                                                                           Frank McCune

yes  I do, depends on the material used, al. case steel liner, very tight press fit, al case brass or  alum  liner finger press drop fit,  what are you  fitting?  and use extreme care  fitting  al. sleeve to al.  case

Randy

      Hi Walter and Randy:

       Thanks for the prompt replies.

       I am fitting two at the moment:

       Steel liner to an aluminum case iron piston.

       Brass liner to an aluminum case with Dykes ring

       Brass liner ABC no ring to an aluminum case.

        I guess that I am stating  a$$ news when I report that these liners are being used in aluminum cases. Lol


                                                                                        Be well,

                                                                                        Frank McCune

The brass liners  have a much closer  expansion rate  so you can fit them finger push in,  the  steel liner needs to be tighter and should be a press fit,  you can push it in a hot case with cool liner
what brand engines?  most will be sized right by the factory  unless  someone has messed  with them

Randy

Randy

       Hello Dan et. al.:

       I asked the question due to the reason that I aint very smart and I have to learn from others. Sometimes I get good information and sometimes I am not so fortunate.  I have had engines reworked by "experts" where the results ranged from less than useable. same as stock prior to reworking, to an engine that was better than stock.  Was the overall effort worth the extra time and cost?

      I have noticed that some engines are a loose fit, some a slight press fit and some a shrink fit.  I am assuming the designer of the engine gave a great deal of thought, well a bit, concerning this matter.  I have been taught the different rates of expansion/contraction of various materials but the question that keeps me awake at night is, what was the designer's considerations when the engine was designed.  Of course the more precise the dimensions, the higher the cost of the engine.  Close fits cost money!  Often the laws of dimensioning returns raises its ugly head and dictates what the designer wises to accomplish with his design at what price point. Expensive engine are more satisfying to use than less expensive engines.

     Getting back on topic, I have learned that it is best to duplicate the fits that the engine was designed to have from the factory.  I think that they know what was required to be best with their product. 

                                                                                               Best to all,

                                                                                                Frank McCune


     

       Hello Dan et. al.:

       I asked the question due to the reason that I aint very smart and I have to learn from others. Sometimes I get good information and sometimes I am not so fortunate.  I have had engines reworked by "experts" where the results ranged from less than useable. same as stock prior to reworking, to an engine that was better than stock.  Was the overall effort worth the extra time and cost?

      I have noticed that some engines are a loose fit, some a slight press fit and some a shrink fit.  I am assuming the designer of the engine gave a great deal of thought, well a bit, concerning this matter.  I have been taught the different rates of expansion/contraction of various materials but the question that keeps me awake at night is, what was the designer's considerations when the engine was designed.  Of course the more precise the dimensions, the higher the cost of the engine.  Close fits cost money!  Often the laws of dimensioning returns raises its ugly head and dictates what the designer wises to accomplish with his design at what price point. Expensive engine are more satisfying to use than less expensive engines.

     Getting back on topic, I have learned that it is best to duplicate the fits that the engine was designed to have from the factory.  I think that they know what was required to be best with their product. 

                                                                                               Best to all,

                                                                                                Frank McCune


     

Frank   as  I wrote earlier in the  thread, steel liners  need  to be fitted  TIGHT , so they can still transmit  the heat into  the case and run stable with power, if they are loose  the case expansion makes for a  gap between the case and sleeve, this causes loss of power, loss of stability, loss of the sleeve and ring staying round, and loss of engine life
the ones with brass  or aluminum liners  will be OK fit with a finger press or drop fit, because of the fact they will expand at about the same rate as the case, but even with Alum liner  you   NEVER want a loose  fit.
Most every engine  maker knows this and makes  them right at the factory, and with todays   cnc made parts,  there  is  no reason  not to do it right

Randy

Are you determing what the fit should be by using a used liner?

Because sometimes a used liner can be barrelled and belled or blown out in the top, giving you the wrong impression as to what it 'should' be.

Castor build up can be misleading too.