Just when you thought every conceivable engine has been tried someone comes up with something different,,,, and extremely weird.


circlecycleice.com - Home

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Pretty damn interesting. Those pistons have to have tight clearances into the cylinders yet they completely disengage from each other. I wonder how long it can last without those tolerances getting far enough out of spec to seize up the engine.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Would be interesting to see a running prototype. Nevermind, theres a vid on page two.

I tend to agree with Kerry, if that gets the slightest bit out of alignment and BAM!!!

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With the ability to manufacture in tighter tolerances than ever before, this is only the beginning. Be prepared to see higher RPM and HP numbers than currently.

pretty cool design

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1987 560SL
85,000 miles

If there was only 1 piston/cylinder on each side the piston could remain in the cylinder. I guess they have the piston exit as a way of exhaust & inlet air.
There is no shaft being driven. would need a gear set up on the rotating drum.

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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
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1968 Ford F750 truck. 6-354 diesel conversion.
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With that arrangement it should be a two stroke. Would be hard to control emissions