Rotating Cummins cylinder sleeve engines ....

Crazy Horse · May 1, 2019

I came across this in a magazine yesterday, interesting stuff. Not sure if anybody has posted anything about it before here at YT. Link below is an article so you know what I am talking about ....
Untitled URL Link

danofarming · May 1, 2019

Interesting

Steve@Advance · May 1, 2019

Well, makes sense, kinda...

But I'm afraid there may be a little exaggeration going on as for efficiency and wear.

That's a lot of pressure to seal around the top of the liner!

I assume they pin the rings in place so they don't turn with the sleeve.

Interesting concept though.

CGID · May 1, 2019

This looks like a variation on the theme of the Knight rotating valve engine of the early 1900's. The Stearn's automobile company (maybe others) used them. During WWII, England's Bristol aircraft engine company made huge, rotating-valve radials used in the Beaufighter, Stirling and Halifax. It appears the new Cummins is an overhead valve engine, using the rotating sleeve as a friction reducing measure. The sleeves on the old engines turned back and forth to alternatley expose the intake and exhaust ports situated in the side of the cylinder. These engines were plagued with high oil consumption. There is a side-port model airplane engine using a gear-driven sleeve that spins similar to the Cummins design.

Crazy Horse · May 1, 2019

CGID ...... yes, the article mentioned what you are referring to, not sure if you read that far. Here's what they have to day ......

"The fundamental basis of the concept is well proven by the historic ?sleeve-valve engines,? in which the cylinder sleeve briefly but rapidly rotated as the engine approached top dead center. The purpose of the fast-moving cylinder was to replace the conventional valves, which had great perceived benefits for high-performance gasoline engines when high-octane fuel was not available. But the unexpected after effect was nearly 10 times less wear, plus better fuel economy. Unfortunately, modern-era pollution regulations prevent the sleeve-valve engine?s resurrection. Thankfully, one significant feature of it, the moving/rotating cylinder and its associated benefits in friction and wear, is about to make a big comeback".

Adirondack case guy · May 1, 2019

I must be pretty thick headed. I can not fathom how rotating sleeves and all the mechanism involved to rotate them could reduce wear, and how they are able to seal off the coolant and combustion areas as they suggest in the article. How can they seal these areas without significant ware???
Loren

Crazy Horse · May 1, 2019

I hear ya Loren ..... but they landed a man on the moon 50 years ago so I suspect they can do what the article says about the engine. Once, men could not imagine how the earth could be spherical, they couldn't get their mind around it somehow.

4520BW · May 1, 2019

I have heard about this but never seen one, next time I am at at the tech center ill see what I can find out. We call those little engines starters around here, they have less displacement then one cylinder of the engines we test.

RBoots · May 1, 2019

Crazy Horse, haven't you heard?!? The earth is flat again! Stupid 'flat-earthers'...

Ross

Crazy Horse · May 1, 2019

I heard something about that RB, probably something worth looking into.

Rotating Cummins cylinder sleeve engines ....

Crazy Horse

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danofarming

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Steve@Advance

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CGID

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Crazy Horse

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Adirondack case guy

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Crazy Horse

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4520BW

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RBoots

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Crazy Horse

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