Scuderi files patent for 'split-cycle' engine

[LeanBurn]

Scuderi files patent for 'split-cycle' engine | Fox News

Thoughts?

[Frank Lee]

Faux seemed remarkably objective for a change.

Scuderi Engine - Wikipedia, the free encyclopedia

I've read about this before; it was all the rage 3 years ago; supposedly they have a fistful of patents already; don't know why this last one is any different.

I've read about how it supposedly works several times and I have to admit, I don't get it. What makes a piston supercharger any better than any other sort of supercharger? On top of that, it's turbocompounded- that's nothing new. So then there's firing at ATDC, which I think is neat, but I don't understand what makes it work in this layout; why couldn't any ol' ICE have that?

[mechman600]

I agree.
Different? Yes. Neat? Yes. Revolutionary? Nnnooooo.

[CigaR007]

Originally Posted by Frank Lee

What makes a piston supercharger any better than any other sort of supercharger?

A mechanically-driven (belt, gear, chain) supercharger robs power from the engine. Perhaps a piston-powered supercharger provides gains in efficiency ?

[Frank Lee]

And a piston is....

mechanically driven.

I don't know how the various types compare re: compressing efficiency.

[markweatherill]

Originally Posted by Frank Lee

they have a fistful of patents already; don't know why this last one is any different.

Maybe it isn't much more than an excuse for a press release ie they need some more investment.

[Frank Lee]

That's probably it. There's supposedly "millions" sunk into it already... it would make a good Aptera engine.

[mechman600]

A piston compressor doesn't give you a chance to cool it down with an intercooler first. That can't be good.

[ProDarwin]

I've talked with these guys at length at the DC auto show. They do already have a fistful of patents. I'm wondering if they keep filing for new and improved patents to keep the technology from becoming openly available when patents expire. I'm wondering if they just want too much $$ to license the engine.

Some of the efficiency comes from:

A) Super high compression. Like 15:1 or greater in the second cylinder. And different comp. ratios for compression stroke and power stroke (like atkinson)
B) Firing ATDC (don't have to compress during combustion)
C) The potential of an Air-hybrid. You can actually store the energy created under compression braking into a large tank (and feed it back into cyl #2 at a later time).

[drmiller100]

Originally Posted by ProDarwin

A) Super high compression. Like 15:1 or greater in the second cylinder. And different comp. ratios for compression stroke and power stroke (like atkinson)
B) Firing ATDC (don't have to compress during combustion)
C) The potential of an Air-hybrid. You can actually store the energy created under compression braking into a large tank (and feed it back into cyl #2 at a later time).

I don't see where 25 percent more efficiency is going to come from.

a. you can run 15:1 in a traditional engine. same problems, same solutions. variable cam timing is a pretty known technology on an Otto engine, which gives pseudo atkinson already.

b. This one is REALLY weak. you can fire ATDC on an Otto. But in any case, your mean average cylinder pressures will be lower, and mileage will suffer. There is spark advance for a reason.

c. Even weaker. You can do an air hybrid using the main pistons, and you can do an air hybrid with an Otto engine. In either case all you have to is completely change the cam timing - not a trivial matter.


This new revolutionary engine looks a whole lot like a Detroit 2 stroke diesel to me.