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FE Power Forums => FE Technical Forum => Topic started by: Qikbbstang on August 01, 2013, 09:30:04 PM

Title: Do piston rings rotate and if so how much? ........ I know 2cycle rings are
Post by: Qikbbstang on August 01, 2013, 09:30:04 PM

prevented by a pin so they will not get an end stuck in a transfer/exhaust port. But on an auto engine not sure how much or even if there is anything that would make em spin

Title: Re: Do piston rings rotate and if so how much? ........ I know 2cycle rings are
Post by: jayb on August 01, 2013, 10:26:47 PM

I assume that they rotate through 360 degrees as the engine is running because they are never in the assembly position when the engine is taken back apart.  How fast would probably depend on ring groove clearance, size and design of the ring, cylinder wall prep, etc.  I don't know of a rate of rotation, if that's what you are asking...

Title: Re: Do piston rings rotate and if so how much? ........ I know 2cycle rings are
Post by: chris401 on August 01, 2013, 10:59:43 PM

That has been mentioned at work. If a compression test (cylinder leak down test) show low in test cell they will run longer and recheck. Rings rotate and give accurate reading.

Title: Re: Do piston rings rotate and if so how much? ........ I know 2cycle rings are
Post by: GJCAT427 on August 02, 2013, 05:16:19 AM

Yrs ago someone did a vidieo about this subject. As I recall they proved that the rings do indeed rotate, It was avery detailed report, showing before and after pictues of the ring location in the clyinder wall.

Title: Re: Do piston rings rotate and if so how much? ........ I know 2cycle rings are
Post by: Barry_R on August 02, 2013, 08:07:54 PM

They do rotate - fairly slowly if things are working properly.  Sealed Power (and others) have run tests on this.  If I recall correctly they only averaged around 12 RPM in the Sealed Power testing with a wide range of variability.