VACUUM GROOVES

[G.E.M.Participant @g-e-m]

HAS ANYBODY ANY INFORMATION ON VACUUM GROOVES IN SMALL VALVE PISTONS.  RATHER THAN FIT O RINGS OR PACKING YARN. ie HOW THEY WORK AND WHAT SPEC, IS REQD.

  REGARDS GORDON MAY

[G.E.M.Participant @g-e-m]

[CirclipParticipant @circlip]

First poin Gordon, KILL THE CAPS LOCK, it don’t arf stab you in the eyes.

 

  Trying to take an objective view of your question with ref. to the “O-Ring” and Packing yarn bit, the “Vacuum” grooves you are reffering to are actually Oil grooves.

 

  When turning a piston, the first two mentioned are recognised methods of obtaining a sliding seal between the piston and bore faces. Another is a metal piston ring.

 

 If you can obtain a “Ploppy” seal to the piston and bore (Essential on a Stirling or hot air engine) then if you turn a couple of grooves in the piston body, when the engine is running it allows an oil film to be dragged onto the bore walls which not only acts as a “Seal” but is pretty effective at lubricating it as well.

 

    Regards  Ian.

Edited By Circlip on 11/09/2009 12:36:44

[G.E.M.Participant @g-e-m]

Thanks for the info, Ian all is now clear

 

  Regards Gordon.

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