A simple test is to spin desmo valvetrain my hand, and try to spin traditional valvetrain by hand.mitt said:That isn't 100% true. You have losses due to friction, spring hystoresis, and poor force transmission angle going back up the cam.
Power not due to desmo, this is all cam lift, cam timing and duration, volumetric efficiency, compression ratio ... so many things working in concert. Confused about one thing tho, who has less moving parts here? Have you looked inside a desmo lately not to mention a 4 valve head on a desmo? Markmonsterone6 said:Less moving parts= More power , Simplicity= Better performance
I cant remember the link there was a test between the Buell XB900 and the S2R 1K. If you look at the dyno chart you can clearly see were the Duc starts making power around 4500-500RPM due to the Desmo system
Which series would those be? I seem to remember a certain afro'd guy on a yellow bike cleaning up in MotoGP for the past few years.kJackd said:and as a testament to this more effective ( I think) valve system, notice that ducs top the boards in every current race series ( except AMA...). Not the sole reason for current dominance, but but the big four are scratching their heads.
BSB, WSB and MOTOGP are all being led by Ducati riders. But if you want to talk about the past, Ducati has more race wins than ALL manufacturers combined in all levels that they participate in as a whole.TimS said:Which series would those be? I seem to remember a certain afro'd guy on a yellow bike cleaning up in MotoGP for the past few years.
Well, this thread is sorta about history... and how perhaps these valves should be history, at least on a bike like the Monster. Anyway, talking about today, Ducati is not leading the manufacturer's points in MotoGP. They're tied for the lead in the driver's championship, and are 32 points behind in the manufacturer's championship.eettare said:BSB, WSB and MOTOGP are all being led by Ducati riders. But if you want to talk about the past, Ducati has more race wins than ALL manufacturers combined in all levels that they participate in as a whole.
I could make a pretty strong argument that the Monster should be the very last model to lose the desmo.TimS said:at least on a bike like the Monster
Actually the consensus seems to be that Ducati has the fastest bike this year. Bringing up #46 is like saying that Nike must make the best golf driver since Tiger Woods wins a lot.TimS said:they're hardly cleaning up on the world stage as you make it sound.
That only tells half the story - sure its much more difficult to turn a traditional sprung valvetrain, but only half of the time - the energy required to compress the springs is largely given back when they decompress - if you balance a regular cam at the right spot, a slight nudge will spin it until the next cam starts ramping up a spring. The "static state" comparison between turning a desmo valved cam and a regular sprung valve cam isn't what actually goes on when a motor is running.mitt said:A simple test is to spin desmo valvetrain my hand, and try to spin traditional valvetrain by hand.