The new designed head replaces the conventional valve train with two rotating spherical valves. They have run a small block ford at over 12,000 rpm with these heads. Since there is no oil in the top of the engine, they claim oil changes of 50,000 miles or more and increases in mileage. This comes from the substantial reduction in rotating friction from the removal of the conventional valve and tappet valve train. http://www.coatesengine.com/videos.html
I wonder how well the rotary valves seal, especially since the exhaust travels through the valve and will heat it up noticably. There were quite a few claims about improvements that just don't make sense considering the basic engine operates the same once the valves are closed. The desmodromic valve system doesn't have much for friction either but hasn't "saved the planet" yet.
Not too many people harp on the "running out of oil" these days. I guess after two hundred years of saying that, this scare tactic is losing its bite.
Less emission, more efficient less combustion/oil contamination.
I watched the OHC CSRV video...reiminded me of a bad infomercial. Anyone else get that feeling?
Yea I see the fact of less contamination, but oil still breaks down. Heat/cool cycles, condensation and bearing material still have a factor in the longevity of oil.
Agreed about the video. I always wonder what they're trying to draw attention away from.
Yea I see the fact of less contamination, but oil still breaks down. Heat/cool cycles, condensation and bearing material still have a factor in the longevity of oil.
When you seal off the rotating assembly from the valvetrain, you do not have the hydrocarbons contaminating the oil.
No expert on oil, but would say that the major issue is contamination. Look at rear gear oil...100k miles, sealed, no contamination, only heat and pressure.
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