Multi 1200 - 15k mile Valve Adjutment Intervals

[Speeddog]

Here's the whole slice of text:

With the arrival of the new Multistrada 1200, Ducati will reach a significant milestone in the company's engineering history by extending the periods between major services on the new model to an owner-friendly 24,000km (15,000 miles).

Doubling the mileage between valve clearance inspection has been made possible with the introduction of a new valve seat material combined with improved combustion efficiency and temperature management designed into the Multistrada's new Testastretta 11° engine.

So called because of its minimised 11° of 'valve overlap' - the interval of crankshaft rotation during which both the intake and exhaust valves are open at the same time - the new Desmodromic power plant not only transforms the world championship-winning 1198 configuration into a super-smooth 150hp motor for sport touring, but also improves fuel efficiency, emissions and cost of scheduled maintenance.

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I've yellow texted the two statements that I think are relevant.
I'd like to see what the lift and duration numbers are as well.

[triangleforge]

Less overlap also means that the valves spend more time in contact with the seat, which should transfer more heat to the valve seat (with its special "new" material) and keep them cooler than in the 1198.

[Monsterlover]

I think overlap is independent of the time the valve is closed as it only describes the relationship of an intake to an exhaust valve.

As mentioned above the duration number is what counts. Or rather 360 degrees - the degrees of duration should equal degrees of cam rotation the valve is closed. Which could be converted to time at a given rpm.

[The Don]

^^^^^ Wow, could you dumb that down a little for me.
Don

[Monsterlover]

Overlap is when both intake and exhaust valves are open (this is for a short period of time)

The amount of overlap is just how long both are open at once.  The reason engines have it is because someone figured out that if you open the intake slightly before the exhaust starts to close, the exhaust gasses rushing out (think momentum here) actually pull in some fresh intake air.  It helps get more air in to the cylinder.

Duration is how long a valve is open.  360 degrees of duration would be a cam lobe that is perfectly round (as in it would never close)  Since valves have to close the duration is never 360 degrees.  More duration = valve open longer.  Less duration = valve not open as long.

Note that duration is measured from the instant the cam starts to open the valve to the instant it returns to fully closed.

I probably just made it worse, huh

[caperix]

Overlap is when both intake and exhaust valves are open (this is for a short period of time)

The amount of overlap is just how long both are open at once.  The reason engines have it is because someone figured out that if you open the intake slightly before the exhaust starts to close, the exhaust gasses rushing out (think momentum here) actually pull in some fresh intake air.  It helps get more air in to the cylinder.

Duration is how long a valve is open.  360 degrees of duration would be a cam lobe that is perfectly round (as in it would never close)  Since valves have to close the duration is never 360 degrees.  More duration = valve open longer.  Less duration = valve not open as long.

Note that duration is measured from the instant the cam starts to open the valve to the instant it returns to fully closed.

I probably just made it worse, huh

But its measured by crank rotation so 720 degrees would be a perfectly round cam.

[Monsterlover]

That i did not know

[jerryz]

This is crap..i do not trust those service intervals at all even if they come from DUCATI its insane ...Same as VW and Audi with 20,000 mile oil changes and services which lead to lots of new engines being required .....all a plan to sell more spare parts or new vehicles .

DO NOT FALL FOR THIS BS. 7500 -8009 miles is OK but 15000  a recipe for disater.

[NAKID]

20K mile oil changes? Where are you getting this? First change at 5k, then 10k, then 20k, 30k, 40k, etc...

[1KDS]

AFAIK 10k is about the longest factory recommended interval, which is about twice as long as I would run it.

[zenjim]

I don't know about doubling the service interval for valves, but cut the price in half and you can call me a customer.

Oh sweet Multistrada, I hear your siren call, but the dusty wallet is a shrew that cannot be tamed.

[sally101]

So called because of its minimised 11° of 'valve overlap' - the interval of crankshaft rotation during which both the intake and exhaust valves are open at the same time - the new Desmodromic power plant not only transforms the world championship-winning 1198 configuration into a super-smooth 150hp motor for sport touring, but also improves fuel efficiency, emissions and cost of scheduled maintenance.

I assume you are implying that this is all emissions related?? The tech presentation they gave said they did this to make the motor less peaky and give more power across the rev range. You can always throw the 1198 cams in there if that's your thing...

DO NOT FALL FOR THIS BS. 7500 -8009 miles is OK but 15000  a recipe for disater.

Many people have claimed they can increase the interval by using better quality seats and collets... Sounds like this is exactly what they did. Do you have some technical reason why 15k is impossible?

[NAKID]

The interesting thing I see is that for the majority of buyers won't hit the first valve service before the warranty runs out.

[junior varsity]

The interesting thing I see is that for the majority of buyers won't hit the first valve service before the warranty runs out.

I think this is going to be a part of it - There's some gambling in all of these decisions - cost / benefit analysis - how many miles will really be put on the bikes

[jwoconnor]

Was the seat material something other than is commonly used in Asian bikes? Does a Desmo valve contact the seat with that much more force than a sprung valve?