Misano WSB

[350TSS]

I have Eurosport that lets me watch BSB and WSB on demand after the event whenever I feel like it.
WSB (and WSS to be honest) has been a bit of a foregone conclusion this year but if you get the chance watch the WSB Superpole race from Misano. Some of the best riding I have ever seen, backing it in on downhill off camber corners and millimetre perfect apex hitting with the riders right on the limit - truly breath taking

[crawsue]

Give Bautista the trophy now…it’s a done deal…..Toprak is riding the wheels off the Yam for the odd win….I’d love to know what the difference is between Ducati’s Moto GP mill and the WSBk motor…..Having said that it appears that Bautista is the only Duc rider to be able to do the business….

[slob]

Originally Posted by crawsue

….I’d love to know what the difference is between Ducati’s Moto GP mill and the WSBk motor…..

about £100K of special parts, pure prototype GP has no ‘production based’ requirements

[crawsue]

Yeah got that, Slob, but I understand that the V4 mill currently on a range of Ducati road offerings is architecturally the same as the Moto GP motor…..most manufacturers have utilised pneumatic valve activation, does the Ducati Moto GP project continue with Desmodronic ? Bautista’s WSBk is rumoured to produce 250 bhp +…….I assume Bagnaias’ is nearer 280…. I remember around 2004 Steve Hislop smashed the Donnington lap record on a Superbike weekend……a few weeks later when the Moto GP circus arrived in town VR46 was shocked to learn this ….and all with steel brakes….!

[slob]

race bike are all desmo (afaik)
multistrada gt has valve springs, purely to make servicing cheaper (longer intervals)
using the advances in materials learned from decades of increased wear on desmo systems.

the v4s i test rode (at misano as it happens) was completely bonkers, even at my skill level approaching curvone was the fastest i’ve ever ridden a bike.

this is a d16rr being serviced , and that has a ridiculous replacement schedule for everything from the crank up.

[350TSS]

I do not think I agree with your point about increased wear in desmodromic valve systems. Desmodromic cams, (provided they are set up with the correct opening and closing clearances) only have the rolling resistance of the cam face against the rocker and the weight of the valve to contend with. Conventional valve spring have to contend with the above plus the resistance of the spring which must increase the pressure and therefore the wear rate at the point of contact between the cam and the rocker.
I think that Desmo service intervals were always set by Ducati to provide service income for their dealers. My 35k mile 750SS has never had any adjustment to the valve clearances as it has always been in spec.
The change to valve spring on the Multis I think was to reduce manufacturing cost both in terms of parts and assembly time, to de-skill the servicing requirements and to compete against the BMW GS in a credible way. - all potential buyers knew that Desmo servicing was required at specified intervals and that it was expensive. Ducati could not credibly say that Desmo servicing was now extended to 30k miles as no one would believe them

[slob]

fair enough, but my info came from the factory launch presentation for the gt motor

[Kato]

Well, one number is the answer — 60,000 kilometre (37,500 miles) major service interval.

The only way they could achieve that is with a conventional valve train, Ducati also say they’ve moved to springs on the Multistrada V4, as they don’t need the high-revving benefits of the desmodromic valvetrain on that engine.

[Kato]

Originally Posted by crawsue

I’d love to know what the difference is between Ducati’s Moto GP mill and the WSBk motor….

Part of the differences



This is part of the service scedule for a customer WSBK although I suspect full factory motor will be similar

So new pistons, valves, bearings ect every 1500 miles, and if it holds together for a season you can sell it on to a club racer to use and maintain indefinately

MotoGP engines don't have a service schedule they do roughly 700/1000 miles each and are then scrapped or gutted and used as display items

[crawsue]

Interesting responses….especially service interval differences…. I spoke with a chap a couple of years ago in Inveraray, he was out for a run from Carradale on his Desmosedici…..after all the oooing and ahing from the assembled throng…..we chatted about service requirements, he had a pal who worked for Ducati Coventry who had “acquired “ a Desmosidici motor and was holding it too swap over at 15k miles when the major service was due …..he assured me that it was a cheaper option…..almost like a service replacement….the Coventry guy would then refurb his motor and move on…..BTW, I might not have got all the details correct as my ears were still hurting from his arrival…..perhaps not quite MOT compliant….!

[Kato]

D16rr when new came with 3 years servicing thrown in, lots cam up for sale just as that 3 years was coming to an end, maybe because a full service is 5 days labour + parts !!!!!