variable desmodromics? yep: testastretta_DVT

Ducati DVT

Interesting. Dynamically timed valves for next 4v bikes:

Ducati Introduces Desmodromic Variable Timing | Sport Rider

HarmonyJim said:

Very cool technology for motorcycle engines. Maybe we will see this in the upcoming Panigale series of engines? A variable cam timing SL engined R model would be fabulous. Anyone know if variable valve timing legal in WSBK? This technology transformed high-performance car engines - is direct injection far behind? Great torque, incredible top-end, low emissions, and better mileage. A great time for bike engines indeed.

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I don't think VVT is legal in Moto GP or WSBK but I might be wrong.

After a few hours of reading it does not state anywhere I can find in the FIM/WSBK 2015 or MotoGP 2015 rules, anything about limiting the types of Valves or timing/control of the valves.


Ohh snap.

SPS996 said:

I don't think VVT is legal in Moto GP or WSBK but I might be wrong.

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This is a quote from wikipedia about pneumatic valves:

"Today, almost all of the MotoGP teams use pneumatic valve technology on their bikes, including Yamaha, Suzuki and Honda. Ducati uses a desmodromic design."

So with the exception of Ducati, there are no camshafts in MotoGP which means that the timing is computer controlled.

So I'm not sure this VVT system is a huge advantage for a race bike that's above 6000 rpm for an entire race. Just set the cam advanced and be done with it. No need to ...... the cam on a race bike.

It's best for low end torque, idle, and fuel economy. Great for farm trucks.

bikenamenumber said:

This is a quote from wikipedia about pneumatic valves:

"Today, almost all of the MotoGP teams use pneumatic valve technology on their bikes, including Yamaha, Suzuki and Honda. Ducati uses a desmodromic design."

So with the exception of Ducati, there are no camshafts in MotoGP which means that the timing is computer controlled.

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They still use camshafts, just air pumps instead of valve springs.

Buliwyf said:

So I'm not sure this VVT system is a huge advantage for a race bike that's above 6000 rpm for an entire race. Just set the cam advanced and be done with it. No need to ...... the cam on a race bike.

It's best for low end torque, idle, and fuel economy. Great for farm trucks.

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Fair point maybe on a track-only bike, but for anything ridden on the street, regardless of sportbike, adv or tourer, VVT is great as it increases the flexibility of the engine and broadens the torque curve. Would be awesome to see continuously variable lift as well. Won't be forthcoming for a while, but I for one wouldn't be at all averse to a Pani that had the low end torque of a Multistrada, ran smooth as a kitten at light throttle while getting 50+ mpg noodling around, then seamlessly transforming into something like a road-going version of Canepa's EVO bike when you let it rip. Variable timing and lift are how to get there...

Just got the official Ducati email of DVT introduction. Sounds like it will be expensive at the valve check interval of 18,000 miles since they specifically call out that only a factory Ducati tech named "clarence" can do this work. Dude must have magic hands!

probably similar to a Kawa system...more like cam phasing or valve overlapping
Concours 14 V-V-T ** www.Concours14.com ** - YouTube

but DVT has effect on both intake/exhaust tappets.likely continuously rather than 2 steps.inevitably ducati will start using cam sensors for their new engine from then on for feedback.

perhaps a couple of years after DVT,implementation of Variable EVENT and LIFT will be a further update or next mild-stone.

Personally, still think Kawa seems to be more advance with the H2R/H2 and really gets me stir-up...