Carven Motor Really Works?

Impossible to tell. It would be nice to see something beyond an animation on the web site. Anybody can create a cartoon of something working.

http://www.carvenmotors.com/carven/

From:

AlibrePowered - Carven Motor

"In each revolution, the previous exhaust phase overlaps with the next work phase cycle so the actual working phase per revolution is nearly all the rotation of the shaft loosing only a small dead angle. More info at carvenmotors.com"

Color me skeptical. I can see it working as a means of turning hydraulic fluid energy into rotary motion, not accounting for all the conversion losses. But as an IC engine? Nope.

I don't think so either. Lots of surface area, lots of friction, no bearings........

Your link looks like a site for people to try to sell their designs.

I am looking forward to the day we can see the Doyle rotary actually running, now that's gonna be exciting.

Me too. I hope those guys can pull it off.

_{Congrats on #100.}

http://www.alibre.com/

One could achieve the same thing with a double valved reciprocating piston connected to a wheel - like a locomotive. The big difference would be that the locomotive mechanism has been improved by experience to be fairly efficient - although not great either. The Carven is a reinvention of all the problems of the Wankel - many of which were never really solved satisfactorily. The Wankel does not appear in any vehicle made today. For those conspiracy theorists, it isn't because anyone except the consumer killed it.

Mazda is still selling the rotary RX8 in 2011

You really should check B4 U type

Also to STILL ERE and YOSEMIT3: The point apparently missed is that the friction joint is a difficult thing to master. I stand corrected in that the Wankel is still used to race. When our little crew raced, we used engines until they failed - sometimes only a race or two. We were not interested in longevity, nor efficiency per se. Racing engines are a poor example of either, in general. The point further was that it took Wankel many generations of engine to get to the power and fuel efficiency it finally has apparently achieved. But this is not about the Wankel. You all agree that the Carven is probably not viable.

http://en.wikipedia.org/wiki/Mazda_Wankel_engine

looks like sealing would be a challenge.

a lot of surface area, makes efficiency a challenge as well

1. 1 Crescent Moon type piston, Mazda's Rotary has 3 lobes.

2. Carver looks to have a tremendous amount of frictional forces to even think about building. Even the prototype would fail with the lubrication requirements involved would be a nightmare for the journals and plates.

3. Std piston 3.5" dia, stroke 3.0" nice volume X 6, 8, 10 and 12, limited amount of lubrication required.

I can't see this single crescent moon making enough power in it's rotation to develop enough power to do much work with all the frictional losses at the end of the rotational stroke path.

The Carven engine does not seem to be viable. If the animation depicts its actual operation, it would appear the device would lock up, if not explode on the first stroke. Here are my observations:

1-The Carven engine, as depicted in the animation, has a very short combustion to exhaust cycle compared to the overall distance of travel over the circumference of its rotation. This would seem to indicate the need for a series of sequentially timed engine plates or at least a set of several ports on the same plate which would require much more than two moving parts as advertised. Either that or a very large and inefficient flywheel.

2-Making the general assumption that the cycle is ignition first, exhaust second, in a clockwise direction, then by design, there seems to be no means to generate sufficient momentum during the ignition phase to produce combustion and trigger a rotational effect to propel the rotor toward the exhaust port. Additionally, there is no visible means to isolate the intake ( ignition cycle) from the output (exhaust cycle) which would lead to unacceptable losses in energy output since during ignition to exhaust there seems to be no barrier to contain the generated energy from the energy producing combustion phase to the exhaust phase. If there were to be such a system involved, again, it would require more than two moving parts.

Question: Has anyone ever produced a working model of the Carven engine? If so, please submit it so we can all learn something. Thanks

Rega451, thanks for your extend report.

I would need one not for internal combustion but for hydraulic device as I need high torque medium speed (200 rpm) with 150Bar of hydraulic pressure.

In this case, what do you think?

Purchase a Low speed high torque hydraulic motor for your app.

icl3k, I would say that jimh77 is on the right track and you may want to follow up with his suggestion. Just out of curiosity, why would you want to choose such an exotic approach as this "Carven engine" over such simple and already proven methods? By the way 200 RPM is not medium speed, it is low speed. I'm with you all the way on this, and if I can help let me know. Guess the ball is in your court jimh77! Thanks, Steve

My problem is to fit a 100kw hydraulic motor in a 200 mm tube No matter longitud but it has to fit there!!! I couldn't find any solution for that (yet)...

Any help is VERY wellcome...

Luis.

it wont work in practice,