Thom

http://www.mce-5.com/english/index.html

Duke, how do you rate this in terms of engineering?

JohnKoaWood

http://www.new4stroke.com/

hmmm... interesting....

or even

http://www.sandersonengine.com/

If it's polish, you know it's gotta be good!

Duke

They've probably spent millions designing that engine and I bet us regular people cannot afford to buy it so it cannot possibly be engineering involved

Saab actually presented a working variable compression engine in early 2000:
http://en.wikipedia.org/wiki/Saab_Va...ression_engine

86 951 Driver

Direct injection 2 strokes are the way of the future. Everyone knows this.

Rogue_Ant

IIRC, variable CR engines are what is used to test/determine octane rating of fuel...

Feliks

Hi All,

http://fairdiesel.co.uk/products.htm

They are Poles, who skilled spy on the Porche








Regards Andrew

Black51

The music brings it all together. But I thought VCR's are old technology...

Feliks

Oh yes, you right..

And in a measure of free time with my friends amateurs musicans in 1979

http://www.new4stroke.com/D1979.mp3

In my structure exceptionally it is easy to carry out such a changeable compression ratio. He is carrying out sie it behind the help very of straightforward device for the picture. And most important: this device is changing the compression ratio in all top hats of the given engine(even for example 16 cylinders).
It is very much cheap way, and simultaneous in the reliable way is carrying out all described higher virtues of the changeable compression ratio.



Engine new 4 stroke has changeable compressio ratio.
It's up to the angle of coupling with the main piston .

Graph some varations:







Regards Andrew

theedge

Looks like a really neat design... But a rebuild is gonna be quite something.... Rack gears, etc. Piston engines already confuse some people who are afraid of moving parts (rotary engine fanatics). Imagine this.

Feliks

Oh yes, it certainly will we simply do know some about it, because I did have two prototypes, operating under the idea.

The hardest thing is to make a proper project, because, for example, to calculate the same displacement, it was necessary to use a computer, and it turned out that this structure has a variable compression ratio, which in combination with variable valve timing gives the angles not easy puzzle to solve ..
However, according to the motor execution of the project is much simpler.
Here is an example as flat block that has no flaws of the previous flat block of poped.
It can be cast as a single unit. It did not need the division on the block and head. Because the pistons can be put at the bottom and pistons going down..
Do not need a place in the head as the valve poped.








Andrew

FRporscheman

I like this thread - some new tech I'd never seen before. It really excites me as an engineer!

The first one looks complicated - there's a lot of parts that can wear or fail. The new4stroke is pretty clever. I like it but I'd like to see how large that head will be, and how heavy. I like the idea of putting variocam tensioners on the timing belt though. And that Sanderson looks like the barrel engine taken to the next level... still very cool. I'd love to have a Y-6 or X-8 engine in my car, LOL!

Thom

As far as I have heard they have spent 20M€ so far. As the website suggests it was naturally all done in the prospect of selling it to major manufacturers.
Hopefully this engine will eventually make its way into a real world application, giving the word "engineering" all of its value

Chris White

You guys do know that a turbo engine is basically just a variable compression pressure device?
In theory that is a much better solution – low compression pressure and less pumping loss when power is not needed and high compression pressure when required.

Paulyy

with the engines with the 2 extra pistons, lets say a 4 cyl plus the extra 2 pistons per cyl is 12. 4 of 3 different sized cylinders. okay now who would like to rebuild one.

Im not against it, looks cool. but after you hit that 200,000km (120,000miles) it will need a rebuild.

LS1Porch

Aren't the Mercedes Kompressor engines basically the same design as these?

I don't think it's a terrible idea, but ...why bother? Spending all these R&D dollars on an outdated engine design so it can get another few MPG...big deal. Come up with something new!