No more valve recession

[Laava]

This is pretty cool.
http://www.coatesengine.com/csrv-system.html
There is a video as well but it is 4yrs old and full of misinformation and conjecture. At one point they are talking about the predecessor to this engine, "the internal combustion engine" WTF? Cool idea tho
http://youtu.be/pDsRa4eT7co
plus a much more recent one

[jellywrestler]

these have been around since before either colour filming or talkies too.