Spherical rotary valve engine running on propane at 4:30 mark.

[HysteryDiagnosis]

This video is on Youtube but it it hidden. These 855 engines are intended to reduce or eliminate the burning off of flare gas which is an environmental no no.

http://www.coatesengine.com/files/theme/media_6.html

From Youtube:
http://support.google.com/youtube/bin/answer.py?hl=en&answer=181547
What is an unlisted video?

An unlisted video is a different type of private video. Unlisted means that only people who know the link to the video can view it (such as friends or family to whom you send the link). An unlisted video will not appear in any of YouTube's public spaces (such as search results, your channel, or the Browse page). An unlisted video is different to a private video in these ways:
You don't need a YouTube account to watch the video (you can see an unlisted video if someone sends you the video's link)
There's no 25 person sharing limit