found this on another site,very informative, Mike
http://www.racingsprings.com/movies.htm 

watch the tip of the valve stems,never knew they flexed so much

I just watched this from a link on Raby's aircooled technology forum, i can't believe how much the spring actually spins, that would cause a lot of unnecasary wear but it seems it only happens at high RPM, the beehive springs look like they have potential in all applications too.