v-tec? how about rotary valve
12-20-2006, 07:42 PM
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v-tec? how about rotary valve anybody look up the rotary valve motor? Now thats a sweet design concept. It uses cams similiar to an overhead cam design but within those cams is ports directly for intake and exhaust which eliminates valves, springs, rockers etc. Ill try to post the site in a moment.
12-21-2006, 07:09 AM
#2
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Originally Posted by iroc85blu
anybody look up the rotary valve motor? Now thats a sweet design concept. It uses cams similiar to an overhead cam design but within those cams is ports directly for intake and exhaust which eliminates valves, springs, rockers etc. Ill try to post the site in a moment.
The heads were on a SBC, that was installed in an old Ford P/U, and street driven several 1000's of miles... The problem[s]:
1. Pressure seals were shaky, and being worked on.
2. The machinist/pattern maker died.
3. His widow threw all the parts out, including the patterns.
12-21-2006, 05:35 PM
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There was another system that was tried a while back also. They mounted a 2 stroke rotating assembly/block on top of a 4 stroke engine and used it as the cylinder head/valve train. It supposedly made really good power since the pistons in the head actually helped make power rather than use power. The guy patented it and called it a 6 stroke I think.
12-22-2006, 05:43 PM
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12-23-2006, 03:05 PM
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They have been around for years. I saw this at Sema back in the mid 90's if I remember right. Either it does not work, it is too expensive, or they have a crappy advertising company.
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12-24-2006, 01:50 AM
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coates system does work well apparently. from what i have heard they do mostly oil field work, generators, etc. and have all but closed their doors to the vehicle market. they do plan on coming out with a motorcycle, but the video's thay have of it are poor quality, don't have any definite specs yet. i don't believe they really plan on putting anything new into production any time soon. my friend contacted them a while ago about making some heads for another engine.
12-24-2006, 11:36 PM
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Apparently, the US Security and Exchange Commission (SEC) didn't think to much of Mr. Coates business practices. http://sec.edgar-online.com/1997/11/...3/Section4.asp
12-28-2006, 10:49 AM
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There was another company called "Roton Engines" (or something like that), which was tooling up to produce small block Chevy heads with this technology a few years back. I heard that they had problems with compression sealing and oil control. Don't know what happened to them though.
12-28-2006, 09:45 PM
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THere is no way that they could keep a seal for any reasonable amount of time. The tollerances would have to be rediculous and even then they will wear out quickly due to all of the friction. Good concept however, I don't see them lasting past a thousand or so miles without having to replace seals or have them re-worked. Just my $.02
01-02-2007, 02:47 PM
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Read about the Coates engine a few years back, was wery suprised with the concept and to be honest I were a beliver 
But, afer thinking about this for some time and actualy concidering to try and duplicate a head for a 1 cylinder motorcycle, (yes I`m a machinist) I concluded with this: IF this would have been a simple task, someone would have done it years ago and all the cars today would be running these engines, and there`s the friction thing, maby this could have worked in really low RPM engines but hey what`s the point of that
So maby its too early for this concept to see the daylight yet, maybe we`ll see better materials and machine work in a decade or so.
Cool concept though
But, afer thinking about this for some time and actualy concidering to try and duplicate a head for a 1 cylinder motorcycle, (yes I`m a machinist) I concluded with this: IF this would have been a simple task, someone would have done it years ago and all the cars today would be running these engines, and there`s the friction thing, maby this could have worked in really low RPM engines but hey what`s the point of that
So maby its too early for this concept to see the daylight yet, maybe we`ll see better materials and machine work in a decade or so.
Cool concept though
01-02-2007, 03:08 PM
#17
Originally Posted by joecar
Consider this:
nothing seals as good as the poppet valve (combustion pressure assists it to hold a very tight seal).
nothing seals as good as the poppet valve (combustion pressure assists it to hold a very tight seal).
there are plenty of forms of slide valves and hinge valves that could seal identically, also using combustion pressure to assist the seal.....
consider this:
the same basic valve has been used in IC engines for over 120 years.... theres probably some room for improvement with a different design by now... it may be more complex.. it may wear faster, but if there are improvements in any area, even at the cost of other areas, its sure to have an application somewhere.
