[Matra et Alpine]

[quote=stian1979]

Originally Posted by Matra et Alpine

DC put in some impresive lap times with the CVT in testing.

You got any actual figures.
All that I remember about it was platitudes.
ANd nobody says theire idea is a dog

To acelerate a famely van it take some power so batterys had to have a size that would ad weight and take away space. A famely car of some size 1500kg from 0-100km/h in 11 secs nead some power and if you got batterys fully loaded and acelerate to 80km/h and a dude runn into the road so you got to brake. Then you step on it again and at 90km/h the car just die because batterys are runn empthy and the stirling stil did not get up too speed yet so you are limited to 50km/h and slovly acelerating until you reatch 100km/h.

You are AGAIN thinking of only one issue at a time>
The problem is only when you first start up. AS SAID, you would size the battery to manage the peak. You dont' accelerate a car for 20 seconds
Sorry but you're missing the whole point by being single-thinking. Build in what the Stirling engien is doing durign the acceleration of the vehicle and what it is doing durign coast and steady speed ?
Nobody's sayign there are NO batteries but it wouldn't need the SHED LOAD that current hybrids are running

I got more belif that it has to be combined with a traditional combustion engine. Maybe a combustion engine only enabled on city driving and aceleration, disabled during freeway. who konw.

Even if allowed to run at optimim efficiency, then an Otto will be WELL short of the efficiency of a Stirling -- or another "imporoved" combustion engien

So with out balance shafts,

First balancer shafts are requried because of the ROTATION rpbblems.
Do you grasp that ?
So it is ONLY reciprocating weight that is the problem and the only part of a Revetec is the PISTON -- no strong conrod or crank out there
So you first recognise that it's a fraction of teh nromal engien weight. So you've done THE MOST IMPORTANT step already which is minimising the mass. Then if necessary they would apply for balance by multiple cylinders -- jstu in teh same way a V8 manages optmimum any paired Revetec piston seupt should.

1/2 of the conrod is considered to be oscilating and the other 1/2 is considered to be rotating. I did my homework on this, probartly the only thing about engine dynamics I still remember.

That's a simplification that only works as long as you're not trygin to maximise the power output or the efficiency. Sadly I believe you've forgotten more than you think
[quote]2-strokes are the moust inviromental engines.[/quote}
BS and you provide the answer yourself - as I had already said.

consumtion of cylinder lube oil is a problem caused by the fact that no syntetic oil is made for this purpose.

Rubbish You can't make an oil have long chains to maxinmise lubrication AND burn efficiently. You are thinking of only one thing at a time again.
let's now jsut save me the hassle. You're wrong.

About cylinder preshure I'm right. Even the preshure drops by 50% I will stil have 50% longer arm than the revetec. It all ends up in the same in the end.

NO it doens't !!!
You are wrong.,
You are NOT thinking of the whole system again>
A crank does not match the optimal piston pressures because of the angles !! This is what the Revetec designer ( and many others over hte decades ) is trying to recover energy better.
Sorry, think about the CRANK positin as well as piston and do the vector force calucaltion and see how much is goin in to provide OUTPUT force.

There is no practical reason for adapting this design. I like it, it's a funn concept, but it's also all it is.

Because you've NOT actually looked at the force vectors in all the components.
Do it, you will learn and understand.

I'm stil concerned about the bearing. Not anny ball bearing is 100% round, maybe it is 99,9999999%, but not 100% ball barings don't handle the same load as a plain baring and if anny contamination in the oil like soot or other particles it will just dig into the plain bearing and do no futher harm.
A ballbearing can more easely get permanent problems witch I'm shure you are avear off.

Yeah but why is a ball bearing coming in to it ?
Do you mean NEEDLE bearings ?
Needle bearings can handle the pressures.
I think you are still thinking of only one thing at a time. Different materials could provide it, perhaps sacrificial. Oil bath coud deliver it at higher speeds onto the mating surface. WOudl still need strong material tho as it won't benefit from pressure build up from rotation the way a crank does.
But as you are not clearly aware the forces beign talked abotu are the SAME as a normal Gudgeon Pin on a piston is handling
So how come it survives there and yet won't here ??
MATERIALS and oil supply -- the challenge will be having ENOUGH pressure to ensure a minium thicnkess of oil to ride on.