MOTOGP » Yamaha's engine strategy explained

Yea Harryx,
I would like to see who was the quickest in the speed traps to.

Ace27, surely yamaha are right to do what they are doing, I mean the old engine was not that bad apart from the power or let's re frase it because the actual engine has the grunt it's the electronics side of things that's screwed Yamaha up receltly.

Design then development is the answer if the engine is good why change it completely just develop it.

Let's hope that we see the pneumatic engine in all the Yamaha bikes.

Numbers...I just looked and during a race the piston travels more than 50 km in the cylinder...

Anyway, does anyone, just anyone, have a link or info on the topspeed of the bikes at Sepang??
As there are two straights in Sepang there could be some interesting data???

Thanks.

Against a tough competitor like Stoner on the Ducati they can't afford any 'glitches',
Casey finished all races in 2007, even a single DNF through engine or tyre problems (or dropping it like at Sachsenring) is unacceptable. But I'm sure they realize that.

try even imagining a piston going up and down at 19.000 revs... accellerating, slowing down. accellerating.... unbelievable

i agree morgue i even agree with wat ace27 says rossi sayin he'll see his career out with yam complete p/r b/s,this season will tell.
schwantz rode rossis yam at the end of last season and completely slated it,sayin out of the duke the suzuki and the yam the yam was the only 1 that got "outta shape" on him,he said "i dont care who you put on that yamaha it was never gonna win the title.im amazed rossi won four races on it" comin from schwantz you gotta say he knows wat he's talkin about.he also added the ducati was awsome,it just did everything well,so no suzuki bias either.if yam dont come up with something this season i see rossi going to suzuki

Takanori Okuma, Project Leader of the Honda RC212V openly admitted that Ducati had surprised him: "Honestly, I did not expect that a motor that revs so high could run such a pace for race distance on 21 liters. I calculate that the Ducati is turning 19,250 RPM. We believed that with an engine of similar dimensions it would be difficult to complete race distance at 18,500 RPM." (If you assume linear piston speed at 26 to 27 meters per second you can arrive at an educated guesstimate of bore and stroke.)

Hey Morgue, like I said; Stoner will have to work for it this year. Only at the IRTA test in Jerez we'll know more about the realistic potential of the teams.

But still, if the usual suspects stay rubber down and don't get into blowing up parts of their bikes, then a lot of them could get really close. Consistency was the word in the last 2 years and I'm sure it will be the case even more this year. I mean losing your points once could throw you off for the rest of the year.

(Actually 17 m/s is for cast iron engines :blush At a certain point the instantaneous piston speed can get so high (> 40 m/s) that aerodynamically and inertia wise you get in to "trouble".

Thanks Harryx,

Ther you go. Proves what an old fashioned guy I am like I said the number didn't apply to racing bikes...

Kevin Schwantz is one of Valentino's idols (besides the late Norick Abe), you never know.
This is the year of truth for Yamaha I think.

17 m/s is quite old.

Even an R6 exceeds 22 m/s. A MotoGP bike could go up to 24 - 26 m/s!!

Any one knows the stroke of one of the GP-bikes?

Example: 2008 spec R6:
stroke: 42.5 mm
1 rev : 2 strokes
max. e-speed 16000 rev/min = 267 rev/sec

42,5 mm *2*(16000/60)[rev/s] / 1000[mm/m]= 22.7 m/s

end of last season yamaha said it wasn't goin to carry on development with the pneumatic engine,so why the u turn,yamaha dont like u turns it took rossi and burgess to convince them to go to a 16v head and dump the 20v the season before.
interesting thing is that i've read that schwantz is lined up for a suzuki team next year as manager
yamaha know that the suzuki was stronger than them last season and that rossis contract expires at the end of this season

17 m/s is the figure I learned in Engineering school, it probably didn't apply to racing bikes
The limitations are probably set by the materials used for pistons and treatment of cylinder walls.