sideways_Into_3rd

No cam
No rocker
No valve
No spring
No pushrod ...

instead ... Spheric rotating valves its like having little wankels for valves

im speechless

http://www.coatesengine.com/technology.html

never seen anything like it posted before .. what do u guys think about it ?

heres a Picture

Mr. Horsepower

If only they worked as well as Coates would like us to believe.

I've had some experiences with these heads.... I'll get to it later as I'm on my way out right now.

Take care

jimlab

I think they're vaporware.

I contacted Coates about their heads before I decided to go with coverted AFR 215s and was told that the price started at $15k, that there was no set delivery date, and that they couldn't give me any guarantees on power. Sounds like a bargain to me.

Except for their web site and a couple magazine articles that pretty much regurgitated word for word what they claim, I haven't seen or heard of anyone using these heads in the "real world". A breakthrough on the level their claims represent should at least get someone interested, and yet no one has a set. At $15k+, I can understand why.

Mindgame

If something like this were that great, I think we'd see a few guys using them by now. I mean, they have been out for what now..... maybe 6 or 7 years? Never seen one in action on the strip or street for that matter.
It's a neat concept but just seems like a gimmick to me.

-Mindgame

Fast Caddie

How about the "barrel" design engines? I found one while poking around on an engineering website a while back. It supposedly works at double the effeciently of current piston engines.

Dr.Mudge

Caddie, if you want efficient, go rotary. Then again, your powerband is going to look like a motorcycle, guys are pushing 550 NA HP from 2.0L 3 rotors at 14k RPM.

Sorry to see the Coates stuff not have as much promise as they claim, although with a 15k price tag maybe that is a good thing, since I dont have to think about it. I think they claimed 450HP from a 5.0 Ford just by slapping the heads on, that would be on an engine probably doing 225HP in stock form (not sure what year it was).

They claim to be in talks with some foreign automakers, as well as currently providing for I think generator/powerplants.

jimlab

The only thing that rotary engines are efficient at is turning fuel into noise.

Chris 96 WS6

I read a couple of years ago that both Ford and Chrysler were working with Coates to develop the tech into production cars....obviously they haven't gotten far or we'd have heard more about it.

I think GM decided to go the direction of the electromagnetically actuated poppet valves instead..might not be as efficient as the rotary valve concept but eliminating the cam, rockers, pushrods, lifters, etc has to have some efficiencies of its own, plus the opportunity for infinitely variable valve timing through PCM control is a huge advantage. We'll see this technology in production cars around the end of the decade.

number77

i see how it works on low rpm engines, but if you were to go say high rpm forced induciton, to me it looks like it wouldn't work at all, if the air is going into the sphere and a high speed and the sphere turns, wouldn't the air that is trapped inside it push up against the incoming air?