Brook Henry and Andrew Cathcart of Vee Two Australia stop by the garage to show Jay their 1981 900SS that features their Vee Two Ritorno Twin engine that has an air-cooled SOHC desmodromic 90-degree V-twin four-stroke with two valves per cylinder and bevel-gear camshaft drive.
2018-12-19
Jay ( 2:44 – 3:50 ) still doesn't understand how desmodromic valve mechanism works! Jay thinks it works by "bevels", but bevel gears are the gears shown used to merely right angle the drive shaft and camshaft… and is also used for non-desmo OHC Ducati engines… desmodromic works by rocker arms ( not "gears" ) that both open and close the valves… relying on tiny valve springs to only hold the valves fully sealed close
I bet they didn't take that bike back home. $58K is a drop in the bucket for Jay.
super video i drive 797 neutral is hard to find (2018 bike) lol
Beautiful machine and great niose
Just read a comment further down I very much agree with, top notch bike and crap logo, sublime to the rediculace, springs to mind
I do like Jay.. but i wish he would get his facts right…. the bevel drive is for accurate valve timing not valve flote .. that was the desmo system to deal with that
Did Leo G. Tune that one? It’s a beauty!
Love it._.but no mirrors?
I'm an athiest but GOD, I want one of these!! Jay did mix up his explanation of the bevelshaft driven cam system though! The bevel gears don't have much to do with control of the valves, valve control is by the desmodromic system. The bevel gears and shaft just drive the camshaft and was standard practice for quality race engines of the era. The valves are both opened AND closed by rockers that are driven by the cam. Actually, if the clearances are adjusted correctly the engine will run with no valve springs! Although starting may be a bit difficult! The springs fitted to a Desmo engine are quite light and are mainly there to seat the valve at low engine speed and for reliable starting. The Desmo system is a thing of engineering beauty but very expensive to manufacture on a road bike. It does allow way more radical valve timing though, as there is no chance of valve float. Also, over rev on downchange is not an issue, unless it's of a drastic nature!
Jay is confusing bevel with desmo.