WordCamps are casual, locally organized conferences covering everything related to WordPress.  The first such event was WordCamp 2006 in August 2006 in San Francisco , which lasted one day and had over 500 attendees.   The first WordCamp outside San Francisco was held in Beijing in September 2007.  Since then, there have been over 507 WordCamps in over 207 cities in 48 different countries around the world.  WordCamp San Francisco 2014 was the last official annual conference of WordPress developers and users taking place in San Francisco, having now been replaced with WordCamp US. 
Typical normal-service engine valve-train components may be too lightweight for operating at high revolutions per minute (RPM), leading to valve float.  This occurs when the action of the valve no longer completely opens or closes, such as when the valve spring force is insufficient to close the valve (it does not fully rest on its seat even though the cam would allow the valve to close) causing a loss of control of the valvetrain, as well as a drop in power output.  Valve float will damage the valvetrain over time, and could cause the valve to be damaged as it is still partially open while the piston comes to the top of its stroke.  Upgrading to high pressure valve springs could allow higher valvetrain speeds, but this would also overload the valvetrain components and cause excessive and costly wear.