The end of piston rings?

[bob10]

Got this from the NBC news site. Never heard of them, but sounds interesting, Bob






Aussie invention eliminates piston rings - motoring.com.au (http://www.motoring.com.au/news/2013/aussie-invention-eliminates-piston-rings-40773?WT.z_csource=Outbrain&WT.seg_4=Outbrain)

[ramblingboy42]

A lot of these "inventions" are absorbed by large corporations , never to see the light of day again.

The Brabhams were involved in an engine concept a few years in a top secret venue at a "technology park" on the Gold Coast. Don't hear a thing now.

When oil is not contaminated by combustion and wear particles it virtually doesn't need changing.

Think how much oil would be saved....or not purchased.....hmmm.... might be a good idea to bury this one too.

But the concept.....although not really new.....put into production , sounds good.

[alittlebitconcerned]

Australian inventor has come up a piston ring free design for engines.
Less friction, less heat, less wear and runs more efficiently and increases performance. Interesting stuff.

Aussie invention eliminates piston rings - motoring.com.au (http://www.motoring.com.au/news/2013/aussie-invention-eliminates-piston-rings-40773?WT.z_csource=Outbrain&WT.seg_4=Outbrain)

[BMKal]

Saw something about that on the idiot box recently. Very clever.

[Homestar]

Now, that is interesting.:). It will be interesting to see how far and how quickly this moves if their proof of concept works as planned.

Reduced heat output and smaller cooling packages - maybe we can leave the cooling package on some old Landies the same size, and fit a set of these wizz bang pistons and actually keep the engines cool on a warm day...:D

[Phil HH]

It will be interesting to see how Dynex addresses the problems associated with piston blow-by, which causes crankcase oil dilution and pressurisation.
As the owner of a motorcycle with horizontal cylinders, I can see that their boxer test engine will also be subject to having oil run past the pistons when at rest, with the attendant cloud of smoke on startup. On the bike that I have, later models have pinned rings so that the ring gaps are never on the bottom.
The suggestion that eliminating rings will eliminate the heat caused by friction is a spurious one, as the heat generated by hot combustion gases being forced through a narrow gap will be considerable, and may surpass that generated by ring friction.
I love innovation, especially when it is achieved by simplification, but in the final analysis it has to work.


However, I'm sure that none of these problems will occur, as they have created a Virtual Model.

[ramblingboy42]

there is already thread running on this but I cant find it right now

[Homestar]

However, I'm sure that none of these problems will occur, as they have created a Virtual Model.

:Rolling::Rolling::Rolling:

Yeah, what could possibly go wrong...

[TeamFA]

First thing I thought of was how they were going to keep the piston centred in the bore? You'd have to run a solid rod down from underneath the piston, with the rod kept centre by a guide or similar. Then another rod connected with a pivoting pin, that then connects to your bottom end?

[incisor]

just needs more than 200psi and it should be fine in a virtual world with no carbon buildup or soot deposits :p

[Hoges]

:Rolling::Rolling::Rolling:

Yeah, what could possibly go wrong...

virtually anything or virtually nothing...:angel: I guess they could promote it on one of those virtual reality shows or fund it with bitcoins ... as an example of lateral thinking it's very clever... so was the Sarich engine..which led to a real gem in advanced two-stroke fuel injection technology... just never know where these things will end up....

[Dougal]

It will be interesting to see how Dynex addresses the problems associated with piston blow-by, which causes crankcase oil dilution and pressurisation.
As the owner of a motorcycle with horizontal cylinders, I can see that their boxer test engine will also be subject to having oil run past the pistons when at rest, with the attendant cloud of smoke on startup. On the bike that I have, later models have pinned rings so that the ring gaps are never on the bottom.
The suggestion that eliminating rings will eliminate the heat caused by friction is a spurious one, as the heat generated by hot combustion gases being forced through a narrow gap will be considerable, and may surpass that generated by ring friction.
I love innovation, especially when it is achieved by simplification, but in the final analysis it has to work.


However, I'm sure that none of these problems will occur, as they have created a Virtual Model.

Indeed. I can't see the tolerances required being economic for mass production either. Especially with the wildly varying temperatures of pistons.

Oh well, nothing to see here boys. Back to work.