Duke design internal combustion engine.

[Mac]

Wonder if anybody else has seen this? Really interesting!

http://pixelbark.com/13045/how-the-duke-engines-increases-the-efficiency-of-the-internal-combustion-engine

[416Ford]

That is very slick.

[butch27]

That is awesome. Great idea.

[tomslik]

a lot of late model a/c compressors work like that....
not near as durable as an old york


I didn't see any torque readings...

[enjenjo]

Not a particularly new idea, as Tom mentioned a lot of AC compressors work that way, and Sunstrand Hydraulic pumps have used that principal for 50 years. The problem in the past has always been they are dirty pollution-wise. They may have solved that, but it remains to be seen. Below is the Orbital engine from some years back, they could never make it meet US emissions.

[40]

Not a particularly new idea, as Tom mentioned a lot of AC compressors work that way, and Sunstrand Hydraulic pumps have used that principal for 50 years. The problem in the past has always been they are dirty pollution-wise. They may have solved that, but it remains to be seen. Below is the Orbital engine from some years back, they could never make it meet US emissions.

Frank.....What would that engine have been used for?

[enjenjo]

Not a particularly new idea, as Tom mentioned a lot of AC compressors work that way, and Sunstrand Hydraulic pumps have used that principal for 50 years. The problem in the past has always been they are dirty pollution-wise. They may have solved that, but it remains to be seen. Below is the Orbital engine from some years back, they could never make it meet US emissions.

Frank.....What would that engine have been used for?

That is an Orbital engine from Austraila. They built a plant here in Dundee Mi. To build them for cars, but could not overcome the emissions hurdle.

[Mikej]

The one you are showing would be a 12 cylinder?

[wayne petty]

. The problem in the past has always been they are dirty pollution-wise. They may have solved that, but it remains to be seen. Below is the Orbital engine from some years back, they could never make it meet US emissions.

wayne wonders..  if the piston speed is slower in this at mid point in the stroke causing the issue.  this would impede combustion expansion and create more emissions..

that's what i see in the animation..
the engine linked seems to have sliding cylinder tops against a head plate to expose the combustion chambers to the different intake compression ignition and exhaust ports as the cylinders spin like a wankel rotary design..

i just figured a way to vary the what would be valve timing on the sliding cylinder motor.. install the intake and exhaust ports thru rotating plates. that are sealed with zero gap rings thru the top plate.. extreme precision would be needed. as the wiping seals and rings would need to slide across this fraction of a gap..  since there would be only limited  pressure as the cylinders slide across the tiny gaps.. it might work..

by rotating the intake and exhaust ports they could vary the valve timing to compensate for changes in rpm and load..  that might fix the emissions..

each engine head would need to be  ground after test assembly to get the surface perfect for the intake and exhaust port discs.


on the stroke speed issue..

instead of having it fixed firmly to a wobble plate..

have a rotating plate that drives the pistons but is also driven by the pistons..  but have it with a kink in the warp.. so the downward thrust of the pistons on the power stroke is on a steeper ramp  so they move faster downward...

oh that won't work right..   the roller bearing assemblies needed to transfer the thrust from the piston to the drive plate would never fit over the kinked area..  they are right.. but careful math skills could design the  placement of the roller bearings or ball bearings in an offset on the pistons.. and vary the thickness of the wobble plate so the distance between the rollers is always equal..