here are the heads i was trying to find that you said you never heard of.....
http://www.coatesengine.com/photo_gallery.html
I've read about them...does away with the weight of the valves, springs, retainers, pushrods, and rockers. I wonder how much more efficient, if any, that system is.
been a while since my name was in the title to a thread. It is rather interesting. I find this particularly interesting.
"The comparative efficiencies of the spherical rotary valve combustion engine have enabled engine speeds of 14,850 RPMs. In addition, the spherical rotary valve design can accommodate markedly higher compression ratios than conventional engines. The rotary design provides these exceptionally higher compression ratios with no detectable detonation when utilizing fuels of lower octane ratings. These factors, coupled with the ability of the rotary valve head to deliver more fuel to the combustion chamber than the poppet valve, makes the Coates design especially well suited for more powerful engines."
man, those engines are real cool sounding, and sound way better as far as efficiecy and power, but i dont understand how they work, something about rotary valves? is there a moving diagram on the site i couldnt find? i think it'd be neat to see one in action.
yep so everyone else like me and not know? or we just been shy lately?
Well you might as well as the valve is part of that cam looking shaft. When then shaft spins it moves the open and closed area over the combustion chamber just like a valve would. But this way there are less parts and resistance.
The Sphere is the valve. There is no cam, as there is no need for stem valves. I'm not sure how this would work with boost applications, with no solid metal on metal closing of the 'valves'. There would have to be an air or oil space to counter friction, and that just screams blow-by (not the piston kind) to me.
and more progress.
I keep my eyes open on great ideas...see press release
http://www.coatesengine.com/press_releases.html
:D
Interesting concept. I also find it interesting the only thing they say about "power" is enabled engine speeds of 14,850 RPM but that in and of itself does NOT mean more horsepower or torque.
Also, while the exhaust "sphere" timing allows for the exhaust stroke to evacuate the spent mixture, the timing on the intake sphere does NOT allow for the intake charge to be pulled in to the sphere. Looking at their animation, the intake charge is only scooped up by the sphere. The only "draw" action on the intake side would be a residual vacuum caused by the the intake stroke of the piston and closing of the sphere before the stroke is completed. This might leave enough vacuum in the sphere to cause a rush of air/fuel in to the sphere when it "opens" to the intake manifold.
make any sense?
http://www.coatesengine.com/rotary_motor.html
pass some of that around.
they threw the heads on a stock Lincoln, and made somewhere near 400hp.I can't seem to find the article or video on it for some reason.
What Turbo said is very true, HP and torque curves are mostly due to amount of intake charge and it's timing... Of course a free flowing exhaust and compression ratio are a important factor as well... Without boost, could well spin 14K and not make 100HP, of course I expect it makes a bit more than that...
i would like the think the economy has done this....... or it could end up being something we might remember in a few years where nothing on the net can be found to back up such a tall tale of an engine system like this.
nonetheless........
check it out. like i said, i hope its just the economy and not several companies putting stops on this.
seems like nobody usa side thinks its worth it.
http://investing.businessweek.com/research/stocks/snapshot/snapshot.asp?ric=COTE.OB
http://www.investorguide.com/stock-profile.cgi?ticker=COTE
I remember those (an article) in Hot Rod magazine a few years back.I wonder how much $$$ they would set a person back.
I think its just a sign of the times. More out of the box thinking vs. "bigger better". I thought this one was interesting.
http://www.autoblog.com/2009/11/30/autoline-on-autoblog-with-john-mcelroy/#continued
Seems the way these things always go, lookup all the electric concepts from the 70's that were bought up by the oil companies... Saw some noise about this in industry but they were having lots of issues with tolerancing, and bad vibration problems with the rotating "valves"