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Discuss This Valentino Rossi: Yamaha finally as fast as Ducati MotoGP

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Anonymous

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Matthew Birt  says:

Valentino Rossi: Yamaha finally as fast as Ducati

Valentino Rossi reckons the engine performance of his factory Yamaha YZR-M1 is now a match for MotoGP world title rival Casey Stoner’s Ducati. When MotoGP introduced the new 800cc rule for 2007, Ducati stole a massive march on its Japanese rivals with an engine that at times was over 10mph faster on the straights. Stoner dominated the ’07 title race and won...

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  • Posted 6 years ago (07 August 2009 10:49)

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Nostrodamus

Joined:

Mar 09

Posts: 5404

Nostrodamus says:

There's a Rossi mind game in there somewhere

Sorry my pragmatic gene over rides my conspiracy one. I'll leave the subliminal message hunt for those of you more attune to these things.

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travis73

Joined:

Jun 07

Posts: 370

travis73 says:

Interesting..

Mind games? Or will this silent everyone that says Casey only wins cause of the speed advantage. Never mind that this isnt drag racing and there are corners.

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Richard1967

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Apr 09

Posts: 1399

Richard1967 says:

Stoner

Stoner won the title because he was fastest that season , nothing more to it than that .

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damo071177

Joined:

Jul 06

Posts: 2

damo071177 says:

horseshit

Is Rossi now concerned that Yamaha is looking too strong? Top speed does not determine lap pace,  more important to have a bike that puts down its power predictably. Since the 800s came in there has only ever been one guy fast on the Ducati whereas the Yamaha has been a weapon for the past 2 years - they haven't missed a podium for about 30 races between Rossi, Lorenzo and Edwards.

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bugref

Joined:

Nov 08

Posts: 12

bugref says:

The Explanation is plain Simple, in 2007 Stoner got the edge because his Desmocideci has Desmodromic Valve Spring a perfect engine to handle 19000rpm. almost owns everybike with Spring valves. the likes of the YZR-M1 of the Yamaha.

in 2008 the tide has change when, Yamaha introduces its Newly evolve YZR-M1, which was introduced in Jerez 2008, where Lorenzo won its first win. that Yamaha was powered by a new valve spring used by all the formula 1 car, known as the Pneumatic Valve Spring.

Imagine the YZR-M1, with only Spring Valve and you will have a performance bike used and ran by Randy de Puniet.

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zacklie24

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Jun 09

Posts: 2

zacklie24 says:

yea..now u can say that cause u on the top of the hill while the others still struggle ..so enjoyed while u can..long live Honda

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rotatingmass

Joined:

Jun 09

Posts: 52

rotatingmass says:

I guess the FIM will change the rules and let Ducati use a 1000cc motor against the 800cc competitors, especially since the only jockey that can ride it is out for the next three races.

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travis73

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Jun 07

Posts: 370

travis73 says:

Bugerf

Mate i think you need to research what Pneumatic Valves are. There are no springs to my knowledge. Its operated by compressed air...

And top spoeed means dick when put anything from 10 to 18 corners between straights. Casey won cause he got it around those corners fastest. The straight counts for only a fraction of a lapt time if you have a look at it. But i'm guessing you're like everyone else on here and actually thinking about racing and what goes in to it would make your head explode...

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aquarius

Joined:

Jun 09

Posts: 887

aquarius says:

Pneumatic valve actuation ...

Hello again, playmates ... greetings to both travis and nostro - who always provide a bit of ANZAC sensibility. F1 have utilised " pneumatic valve closing " since the mid 1980's so it isn't like it's a new thing. Mercedez Benz used a " desmo " system in their sports/racing cars of the mid 1950's. Also Ducati have used their desmodromic valve system on and off since 1956 when Taglioni designed their first system which is basically a cam and lever system of mechanically closing the valve. The latter requires great precision in both set-up, metallurgy  and materials, all of which Ducati are understandably not super-willing to share with anyone else and have patented. The camshaft lobe still " opens " the valve in both pneumatic and desmo systems. Why use these alternatives? The problems start with having to use stiffer and stiffer springs to close the valve again at very high revs before the piston arrives. Timing or spring failure means these two parts collide. OUCH! Of course, stiffer springs starts to bring in the Law of diminishing returns - sapping power from an engine as the super-stiff spring is fighting against the cam lobe. Here is where the pneumatic bit comes in. F1 engines use a small cylinder of compressed nitrogen ( it doesn't heat up like oxygen or other gases - nitrogen is quite often used in pneumatic tyres to help keep operating temps down) and it is this gas at some 100 psi that closes the valve - swerving around the spring problem. Similarly, the desmo system uses a " mechanical " method to close the valve but not a traditional spring. Hard to clarify all here with such limited space. F1 engines experience a fair bit of loss and " leakage " from the nitrogen cylinder and use a back-up reservoir to keep re-charging the cylinder so it is at peak pressure. For this reason - pneumatics are not yet suitable for high-performance motorcycle engine use - adding bulk and weight and complexity. I do not believe that ANY Moto GP engine of any make is currently using a pneumatic system. So " bugref " definiteley has his wires crossed here or someone has been yanking his chain. Hope all this helps ...

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thestig08

Joined:

Dec 08

Posts: 1982

thestig08 says:

Twin overhead knee sliders Yawn!

Does all this mean Toseland is still using carbs and points on his Yamaha ? What valves does a daf truck use ? who cares about valves and all this garbage 50's mercs and 80's F1 and 56 Ducati's? Go to an auto jumble or a vintage tractor show and meet like minded people,

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