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ring less compressor pistons

coldkeeper1 on Mon July 28, 2008 8:52 PM User is offlineView users profile

I´ve noticed that many currently available automotive a/c compressors lack rings in their pistons. How does the compression takes place once there is some wear between the piston and cylinder? Does the oil film between the two works as a seal ?

chris142 on Mon July 28, 2008 8:53 PM User is offline

I never thought about it. The old .049 Cox model airplane engines didn't have any rings either.

Chick on Mon July 28, 2008 9:08 PM User is offlineView users profile

I haven't seen one without teflon rings, I'd like to see a pic of one if you have it. They don't use rings like a piston engine, rather a band of teflon or other materil like the shed ring in this pic.. Maybe the other guys can shed some light on it..pardon the pun..



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Tue July 29, 2008 12:01 AM User is offline

All the new CVC compresors are ringless- they have teflon coatings that are ground to size- work great as long as there are no aluminum spots showing through-- also the pistons are hollow- imagine that- air inside the compressor that never escapes!!

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Chick on Tue July 29, 2008 6:22 AM User is offlineView users profile

Well, when the teflon wears out, it will be a disaster when the aluminum begins to wear against other parts....But could it possibly be as bad as when these compressors shed a ring and it gets ground up... I doubt it....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Tue July 29, 2008 8:15 AM User is offline

Well- its been going on since 2002-- haven't seen any major disasters yet..



-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

iceman2555 on Tue July 29, 2008 1:12 PM User is offlineView users profile



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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson



Edited: Tue July 29, 2008 at 1:13 PM by iceman2555

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