Blazen Posted November 23, 2005 Report Share Posted November 23, 2005 http://www.coatesengine.com/ Check out the other stuff this guy has made. Quote Link to comment Share on other sites More sharing options...
TurboTank Posted November 24, 2005 Report Share Posted November 24, 2005 im gonna have to say this...but i think i was still in highschool when i saw those. but good job of reminding me. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 24, 2005 Report Share Posted November 24, 2005 oldy but goody. I dont think we'll see much commonality out of that design though. Quote Link to comment Share on other sites More sharing options...
TurboTank Posted November 24, 2005 Report Share Posted November 24, 2005 works good for a generator that wouldnt need to be started up for several years Quote Link to comment Share on other sites More sharing options...
Blazen Posted November 25, 2005 Author Report Share Posted November 25, 2005 Sorry guys. I saw it in a mag and didn't check the date on it. There has been automotive applacations done,But I wonder why it hasn't been in pratcial everyday use? Quote Link to comment Share on other sites More sharing options...
smokin5s Posted November 25, 2005 Report Share Posted November 25, 2005 anyone know if it makes more power? Quote Link to comment Share on other sites More sharing options...
Berto Posted November 25, 2005 Report Share Posted November 25, 2005 In class we were disussing elecromagnetically activated valves. then your valves can be baically instantly open or closed. and valve timing can be adjusted easily also. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 26, 2005 Report Share Posted November 26, 2005 Sorry guys. I saw it in a mag and didn't check the date on it. There has been automotive applacations done,But I wonder why it hasn't been in pratcial everyday use? It's inefficient in the way it allows air by, you have a glass CFM ceiling. Quote Link to comment Share on other sites More sharing options...
Nate1647545505 Posted November 26, 2005 Report Share Posted November 26, 2005 It's inefficient in the way it allows air by, you have a glass CFM ceiling. Can you expand on that Eric? Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 27, 2005 Report Share Posted November 27, 2005 In your standard crossflow head you have, essentialy, a bent tube that brings air into the combustion chamber, and its controlled by a valve that drops down and the air slips by. The shap of the top of the valve is actualy good for filling the chamber with a good charge. You can go bigger with the valves (to a point), and you can open them farther (to a point), and you can control when with basic adjustments. With the above system you are limited to how big a spinning sphere you can fit over the combustion chamber, and how much of it you can clear out to let air by. The inlet/outlet shape itself isn't conducive to smooth flow. On top of that, it would be tougher to get a good seal on a higher compression engine, standard valves are actualy helped shut by compression/combustion, the forces in the above system would be constantly working to launch the sphere into the stratosphere. Plus you cant make simple adjustments. If you want to change something, you need a damn good machine shop. Also, bearing surfaces. Bearing surface = friction = parcitic loss. Standard valve, you have a bearing on the ends and one between each cylindar, plus the friction of the cam lobes. With the above system, you have a bearing surface of the entirety of the shaft. In the end, its actualy more complicated, more expensive, and less efficient....but it's neato. Quote Link to comment Share on other sites More sharing options...
Nate1647545505 Posted November 27, 2005 Report Share Posted November 27, 2005 gotcha, thanks Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 27, 2005 Report Share Posted November 27, 2005 there are a few things like that "out there". The coates engine, dynamic natural thrust, 4 sided dorito rotary engines. Things that work, but dont make sence to use because better stuff is available. Coates is inefficient and expensive, quadrotors are weak and can oly plant so much torque, and dynamic natural thrust generates almost no lift. What good is an ultralight size aircraft with a 190mph stall speed? Pulsejets can be added to the list as well, but they were developed along side gasturbines, they just turned out to suck in comparison. But they're still developed and used. Quote Link to comment Share on other sites More sharing options...
smokin5s Posted November 29, 2005 Report Share Posted November 29, 2005 there are a few things like that "out there". The coates engine, dynamic natural thrust, 4 sided dorito rotary engines. Things that work, but dont make sence to use because better stuff is available. Coates is inefficient and expensive, quadrotors are weak and can oly plant so much torque, and dynamic natural thrust generates almost no lift. What good is an ultralight size aircraft with a 190mph stall speed? Pulsejets can be added to the list as well, but they were developed along side gasturbines, they just turned out to suck in comparison. But they're still developed and used. dude, what the hell do you do for a living that gets you to learn about cool shit like this? I wanna do it! Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 30, 2005 Report Share Posted November 30, 2005 dude, what the hell do you do for a living that gets you to learn about cool shit like this? I wanna do it! I dunno what they pay me for, I just surf the web all day. Actualy, I'm a mechanical inspector, I inspect garage door components for a living. All this other stuff has been and independant study. Quote Link to comment Share on other sites More sharing options...
Berto Posted November 30, 2005 Report Share Posted November 30, 2005 I'll have to read more on it another time but just like any application as far as engines go there are its advantages and disadvantages. Limiting your adjustability is not even considered a drawback really. It is to you and most of us here because adjusting different aspects of the valve allows for better flow. but when a manufacturer is producing 108039174013984 civics and all that matters is that they all perform like they were manufactured to then thats flipping awesome. Think about all the annoying issues that this could eliminate. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted November 30, 2005 Report Share Posted November 30, 2005 I'll have to read more on it another time but just like any application as far as engines go there are its advantages and disadvantages. Limiting your adjustability is not even considered a drawback really. It is to you and most of us here because adjusting different aspects of the valve allows for better flow. but when a manufacturer is producing 108039174013984 civics and all that matters is that they all perform like they were manufactured to then thats flipping awesome. Think about all the annoying issues that this could eliminate. Two words muh boy; Hydrolic Lifters ever have an engine with solid lifters? Its a nice, static, dead set system that works greak. But like all machines, theres creep, and they have to be adjusted almost as often as the oil is changed. Hydrolic lifters do not require this frequent maintenence. Quote Link to comment Share on other sites More sharing options...
cheezoto Posted December 1, 2005 Report Share Posted December 1, 2005 I'll have to read more on it another time but just like any application as far as engines go there are its advantages and disadvantages. Limiting your adjustability is not even considered a drawback really. It is to you and most of us here because adjusting different aspects of the valve allows for better flow. but when a manufacturer is producing 108039174013984 civics and all that matters is that they all perform like they were manufactured to then thats flipping awesome. Think about all the annoying issues that this could eliminate. it would create more problems than it would eliminate, it would be nearly impossible to get that sphere to seal against the head, not to mention the fact that it would need to be lubricated. So now you are covering your spherical valve with oil which is getting sucked into the engine and burning. No car manufacturer is going to be able to pass emissions with a car burning that much oil. Very cool idea tho, and that is how technology develops. On paper it looks pretty good but in practice it turned out to not be worthwhile Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted December 1, 2005 Report Share Posted December 1, 2005 Very cool idea tho, and that is how technology develops. On paper it looks pretty good but in practice it turned out to not be worthwhile Interesting note; The rotary was the exact opposite. Quote Link to comment Share on other sites More sharing options...
cheezoto Posted December 8, 2005 Report Share Posted December 8, 2005 Interesting note; The rotary was the exact opposite. I love them but I would not call the rotary good in the real world maybe more like "ok". its got plenty of flaws. Terrible on emissions, not so reliable, terrible fuel economy. the main benefits are its small size, its relative light weight and its a pretty simple engine design. More of a benefit for a car as a whole, you can make a better handling car with the lighter weight smaller engine. Quote Link to comment Share on other sites More sharing options...
Berto Posted December 8, 2005 Report Share Posted December 8, 2005 I love them but I would not call the rotary good in the real world maybe more like "ok". its got plenty of flaws. Terrible on emissions, not so reliable, terrible fuel economy. the main benefits are its small size, its relative light weight and its a pretty simple engine design. More of a benefit for a car as a whole, you can make a better handling car with the lighter weight smaller engine. one of the reasons for its poor fuel economy is the reason for its almost electric smoothness and hp/liter advantage is that each rotor fires three times per revolution, meanwhile the 4 stroke cylinder engine one cylinder only fires once per 2 revolutions. this means ur 4 banger fires 4 times in 2 revolutions, meanwhile the rotary fired 12. In order to get that kind of number and smoothness you'd have to look into a 12 cylinder engine and even then the eccentric design of the rotary allows for a smooth application. also the design with no valves makes the rotary's scavenging situation undesirable which causes fuel efficiency problems, from what i understand the new Renesis motor works on some of these issues. And efficiency as a whole of the "system" decreases, because the oval shaped housing increases the surface area for heat loss to the coolant. there are other losses to account for too, i'm just tired of typing. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted December 8, 2005 Report Share Posted December 8, 2005 An even more noteworthy fact: no one has put any money into developing them since 93, with the acception of the RX8. Its an engine that was invented in 1957, its less then 50 years old. Now look at the piston engine, it turned 50 in about 1940, how efficient were those? Quote Link to comment Share on other sites More sharing options...
Berto Posted December 8, 2005 Report Share Posted December 8, 2005 An even more noteworthy fact: no one has put any money into developing them since 93, with the acception of the RX8. Its an engine that was invented in 1957, its less then 50 years old. Now look at the piston engine, it turned 50 in about 1940, how efficient were those? Eric is right, i'm a pioneer bitches. Quote Link to comment Share on other sites More sharing options...
Science Abuse Posted December 8, 2005 Report Share Posted December 8, 2005 Eric is right, i'm a pioneer bitches. If you were a pioneer, you'd have a Wankel Spider. http://www.nsu-prinz-club-schwaben.de/grafik/spider.jpg Quote Link to comment Share on other sites More sharing options...
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