Liquidpiston not dead

[berridos]

LiquidPiston

The combustion engine reimagined

www.startengine.com

 

[wanttobuild]

Dead men dreaming. The big guys are gonna take his idea, eliminate most of the batteries in electric vehicles. They lack the big checking account. This engine can power a generator to charge batteries. I wish them all the best though

 

[berridos]

https://www.facebook.com/video.php?v=493889984704484

 

[wrmiles]

The website says they have a new, patented thermodynamic cycle. I couldn't find any explanation or PV or TS diagrams explaining what this cycle is.

 

[Bill-Higdon]

The Rotary-X Engine Is A Revolution In Thermodynamics

 

[berridos]

Russian torpedos used a wankel on hydrogen.

 

[Ried]

The website says they have a new, patented thermodynamic cycle. I couldn't find any explanation or PV or TS diagrams explaining what this cycle is.

This video show diagramaticaly a PV, but no numbers or detailed explanation. I did note they are running the combustion intake and exhaust through the rotor.

My guess they need 5-10 years to get this to a commercial product if it's really a viable product.

 

[Lendo]

It's just my opinion but from my experience anything less than a straight shot in to the combustion chamber limits the volumetric efficiency (VE) and therefore the power available, due to inward flow disruption (Drag), trying to get through a convoluted passageway. Naturally Turbo or Supercharger would benefit here.
It's much like the Mazda Rotary, with some possible improvements with lubricated seals in the Housings. That's why the peripheral Ports in the Mazda Rotary, will provide up to 30% increase in VE.
Don't get we wrong, I do like it and I'm no expert either, but could be difficult to get into production with everything going Electric
George

 

[Ried]

It's just my opinion but from my experience anything less than a straight shot in to the combustion chamber limits the volumetric efficiency (VE) and therefore the power available, due to inward flow disruption (Drag), trying to get through a convoluted passageway. Naturally Turbo or Supercharger would benefit here.
It's much like the Mazda Rotary, with some possible improvements with lubricated seals in the Housings. That's why the peripheral Ports in the Mazda Rotary, will provide up to 30% increase in VE.
Don't get we wrong, I do like it and I'm no expert either, but could be difficult to get into production with everything going Electric
George

What I recall from my 20th century Combustion Engineering class it that the PV diagram should show small pressure offsets for intake and exhaust gas flow pressure losses. This is why dedicated gear heads will go to the trouble of porting intake and exhaust headers. Turbocharging, supercharging, tuned pies, etc., add different pressure/volume points to the PV diagram that affect overall bmep and efficiency.

 

[pfarber]

What part of 'suck, squeeze, bang, blow' has be revolutionized?

Other than being able to burn jet fuel/diesel its basically three wankels on one rotor. Then never speak to emissions, which was a big problem for the wankle.

No torque numbers?

I like the small and lightweight part. But emissions and (what I believe) will be low torque will be an issue.

 

[berridos]

I dont know much about engines, but if you have three combustions, torque should be higher

 

[pfarber]

I dont know much about engines, but if you have three combustions, torque should be higher

Seeing that the 'moment arm' of the crank to the combustion 'oval' is mere inches (1inch??), and even then tangential to the crankshaft, all you have left is spinning mass and again, not very much.

Its RPM range is not super high (motorcycles rev up to 12000rpm to make any real power). Remember, the torque formula is T = F * r * sin(theta)

r and theta being what I see as lacking

Since most of the ideas are pretty steady RPM installations (generators, drones, pumps) it may have a pretty narrow band that it likes.

Since they are concentrating on 'less than 100hp' I think that may be the limit. Theoretically it *could* scale. If they have a motor that can put out diesel torque values then they win... everything.

I hope it works, but I got a little nausea reading their web site... so many words, so little information.