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 Post subject: Why Sectional Piston Rings?
PostPosted: Wed Dec 12, 2018 12:58 am 

Joined: Thu Aug 05, 2010 2:06 am
Posts: 186
As a corollary to the Steam Piston Ring thread, I've been asked "Why were sectional rings developed?". I don't know the answer myself and with the good discussion going on I thought I'd pose it to all here..............MLD


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 Post subject: Re: Why Sectional Piston Rings?
PostPosted: Sat Dec 15, 2018 2:32 pm 

Joined: Thu Aug 05, 2010 2:06 am
Posts: 186
No ideas? ...Bump...mld


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 Post subject: Re: Why Sectional Piston Rings?
PostPosted: Sat Dec 15, 2018 2:36 pm 

Joined: Tue Aug 24, 2004 12:13 pm
Posts: 407
Location: Baltimore. MD
Single snap rings wear the bore oval, while sectional rings wear the bore round(er).
Steve


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 Post subject: Re: Why Sectional Piston Rings?
PostPosted: Sun Dec 16, 2018 2:36 pm 

Joined: Mon Aug 23, 2004 12:57 am
Posts: 206
Location: Sandpoint, ID
American Hammered developed a peening machine to provide variable tension around the circumference of one-piece rings in the 1910's. This technique was done by hand considerably earlier than that. The result is that when you look at the unrestrained ring it is egg-shaped being a smaller radius at the splitline and larger opposite from it. It is possible to make a ring with these characteristics by laser cutting/ cnc milling which is what they do today for large ship engine rings.

If you don't have a piston or valve that comes apart at the ring grooves, a sectional ring is the practical solution for a heavy cross-section gray iron ring or a bronze ring.


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