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G.E.M.	11/09/2009 11:06:05
7 forum posts	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
Circlip	11/09/2009 12:36:25
1723 forum posts	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.	11/09/2009 17:58:15
7 forum posts	Thanks for the info, Ian all is now clear Regards Gordon.

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