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Buell Forum » Quick Board Archives » Archive through April 26, 2007 » Coates Engine -- Seen this before? « Previous Next »

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Tcskeptic
Posted on Friday, April 20, 2007 - 08:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

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

To my un-mechanical brain this looks very cool. Is there something impractical or pointless about it that I'm overlooking?
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Slaughter
Posted on Friday, April 20, 2007 - 08:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Bearing wear is an issue when you look at the valve seal as a bearing surface.

There IS real goodness to the system though. Not sure just how much flow you can get through a given head size compared to 4-valve head.

There are engines running with the Coates system and run apparently well. Not sure about performance applications.

Would be really cool to see the end to valve/piston collisions or RPM limits driven by valve train considerations.
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Sparky
Posted on Friday, April 20, 2007 - 10:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I've seen spherical valve engine prototypes in Design News going back to the mid-80's. The big gotcha then was, like Steve said, perfecting the valve sealing surface.

Maybe they are making progress? I don't know. I haven't been keeping up -- guys at work haven't been leaving their old Design News around much these days. : (

Perhaps newer innovations in rotary-valve science may one day benefit the rest of us. After all, Mazda didn't overcome the Wankel lobe seal problems and create a truly high-perf engine in a relatively small package overnight.
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Tom_b
Posted on Friday, April 20, 2007 - 10:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

the valve seal problem is probably fixed or at least being improved. like sparky stated about the wankel design, or teflon edged rotors on roots style blowers. i would think just less moving parts would make it more effecient
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Slaughter
Posted on Friday, April 20, 2007 - 11:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If you could flow enough volume - there's a bunch of research in the past decade on self-lubricating ceramic bearings.

So, I s'pose it's do-able.

Having smacked pistons/valves more than once, I look at the Coates system as really interesting.
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Ezblast
Posted on Saturday, April 21, 2007 - 01:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I - also for similar reasons.
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