it really doesn't matter any more because technology is leaving the cyclone behind http://www.gizmag.com/dan-gurney-moment-cancelling-motorcycle-engine-patent/39344/?utm_source=Gizmag+Subscribers&utm_campaign=85f5108cc7-UA-2235360-4&utm_medium=email&utm_term=0_65b67362bd-85f5108cc7-90995777