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Reader Comments (Page 1 of 1)
Leviat 10:24PM (4/18/2008)
I wonder just how much more effiecient it is running off the air tank since it still has to move the compression cylinder.
Reply
Jim 6:22PM (6/10/2009)
Leviat, when the engine is running on stored air, the valves would remain open on the compression cylinder to eliminate drag. There is no expectation to maintain compressed air levels in the storage tank when using it as a power source. The tank would be re-pressurized when the engine is running in combustion mode and could even use the compression stroke for braking/slowing, as well.
Tony K 12:01PM (4/19/2008)
Seems like the frictional losses will be the real challenge to overcome with this design, or any new engine design. I'm always a little skeptical of fancy promotional videos showcasing a nice computer model of revolutionary new technology that hasn't been tested yet. Granted, it could work quite well, and I'll be very impressed, but I'll believe it when a real engine is in a dyno cell putting out real numbers.
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Ray 11:58AM (4/25/2008)
Ingenious design; I just wish it didn't require twice the cylinder count (more weight, more space) than a conventional engine. The air-hybrid version, though, is an interesting possibility compared to electric hybrids.
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Jason 11:49AM (6/10/2008)
It doesn't require twice the cylinder count. With a standard 4 cylinder engine each of the 4 cylinders fires with every two revolutions of the crank. With the Split cycle design 4 cylinder the two firing cylinders fire with each revolution. So with 2 revolutions of a conventional engine you'd get 4 fires. with 2 revolutions of the split cycle you'd also have the same 4 fires since the 2 cylinders will have fired twice.
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crossom 8:49PM (12/17/2008)
I just read a same article in GreenBizSite.
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Jim 6:14PM (6/10/2009)
As for the space/weight argument, they are predicting somewhere in the neighborhood of 130-140hp per liter. That said, a 2L 4cyl scuderi could possibly put out between 260-280hp... without all the added weight of the batteries required by a petrol/electric hybrid. Additional tanks to store pressurized-air may add weight, but not as much as the batteries and are much more environment friendly when it comes time for disposal. Made of carbon-fiber, the storage tanks would be safer in a collision too.
Reply