[Matra et Alpine]

Originally Posted by stian1979

This revetec has same displasement as a normal engine. so at 1000RPM it's going to do the same work as a convensional engine at 3000RPM

That ignores the problem that the angular conrod has in losses in a"normal engine". The Revetec is one of a number of "new" ideas being explored just now that address that significant loss. It's THAT that makes oval cylinders BTW

But the average Nm output is only 2,9 of what a normal engine can do at the same RPM. Why? ask yourself this....Evidence I find trough experience and reading betwen the lines.

That's the issue "evidence" is from everyone reading between lines and applying "normal" engine layout issues to IT.

how long is the distance around the camprofile on revetec's crank? the bearing on the pistion has to go this distance in case you did not notice.

Wrong. The important point about a bearing is it's "contact" surface area. The actual points that has force applied to it. THAT has to either be on rollers or on pressurised lubricant. The issue the Revetec has is that you cant' build up an oil surface the way a rotating journal does. Bu we have new materials It's "pseduo science" like that that raises the question marks over the comments

Traditional bearings only nead to travle a short distance and then back in the connection at the pistion and the distance round the crank that is short compared to the revetec.

IRRELEVANT.
You need to learn a bit more about bearings See comment above.

This statement say it all.
kW=Nm x RPM
Sorry but it's not posible.

aha, the "ideal" engine>?
And why do engines NOT achieve the "perfect" numbers ?
Why are some engines more "efficient" and get closer than others ?
Yep. Think it out. As I have said the thing the Revetec is trying to deliver is the recovery of the loss in power from the operation of a crank. A significant loss and wear factor in an engine.

I can at least tell you that it's more heavy than a normal crankshaft can be made.

Seriously, You WEIGHED a crank ?
Look at the lobes opposite to the pistons for balance !!
It clearly have to find you the quote rather than taking my word that I'd read an early press release saying the bottom end was lighter Did you search the previous UCP posts ??

Ferrari, meclaren and others make supercars with v engine. Why not the boxer? The disanvantage of space is gone when you have mid engine cars.

Well done --- PACKAGING
NOT the engine per-se --- as I said.

They get a lower center of gravety so why not use it? You can only refear to 1 race car doing good on the track with a boxer?

Reading ? ....... PACKAGING ... the boxer engine prevents a race car from using ground effects and body venturis because it's in the way. It works reasonably well in a WRC rally car but does give problems in locating other things -- and hence the Subarus propensity for tearing intercoolers off being limited on placement

Why was this linkage not posible in the past?

Materials. Computing power to innovators to do EAD and stress analysis.
( See the Polish moving piston valves engine that the guy built in his garage L) )
There are many innovators out there trying the new ideas that in theory address limitation of our current designs.
It goes on all the time. The difference is that thanks to the internet we can see, explore and critique these solutions in a way not possible in the past.

So just because it's build in China it's good? Newer heard that one befour.

Now THAT is just a stupid response, isn't it.
HONDA is the company reputedly in the deal.
Tells a lot on your thinking process that you ignored that it might be a MAJOR PLAYER and instead tried to make it sound negative because it was China
All it did was remove respect for your comments.

Otto and Diesel was engineer's so they knew what they where doing and they did it well.

And modern engineers ARENT for what reason ?
And what about all those hundreds of engineers who were developing engines at the same time ? How much do you know about engine development and history ? Watt, Moorland, Brown, Matteucci, Stirling, the list is HUGE.